From b8c2171c441b61c602eba392926301d7bc616399 Mon Sep 17 00:00:00 2001
From: Casey Occhialini <1508707+littlespex@users.noreply.github.com>
Date: Fri, 26 Apr 2024 15:13:48 -0700
Subject: [PATCH 01/21] fix: convert to ES6 modules

---
 src/main/js/doc.js    | 1776 +++++++++++++++++----------------
 src/main/js/error.js  |   27 +
 src/main/js/html.js   | 2215 ++++++++++++++++++++---------------------
 src/main/js/isd.js    |  948 +++++++++---------
 src/main/js/main.js   |    6 +-
 src/main/js/names.js  |   25 +-
 src/main/js/styles.js | 1851 +++++++++++++++++-----------------
 src/main/js/utils.js  |  505 +++++-----
 8 files changed, 3662 insertions(+), 3691 deletions(-)
 create mode 100644 src/main/js/error.js

diff --git a/src/main/js/doc.js b/src/main/js/doc.js
index d38f4ce0..d2c76270 100644
--- a/src/main/js/doc.js
+++ b/src/main/js/doc.js
@@ -24,812 +24,818 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
+import sax from 'sax';
+import { reportError, reportFatal, reportWarning } from './error.js';
+import { ns_ebutts, ns_ittp, ns_itts, ns_tt, ns_ttp } from './names.js';
+import { byName, byQName } from './styles.js';
+import { ComputedLength, parseLength } from './utils.js';
+
 /**
  * @module imscDoc
  */
 
-;
-(function (imscDoc, sax, imscNames, imscStyles, imscUtils) {
-
 
-    /**
-     * Allows a client to provide callbacks to handle children of the <metadata> element
-     * @typedef {Object} MetadataHandler
-     * @property {?OpenTagCallBack} onOpenTag
-     * @property {?CloseTagCallBack} onCloseTag
-     * @property {?TextCallBack} onText
-     */
+/**
+ * Allows a client to provide callbacks to handle children of the <metadata> element
+ * @typedef {Object} MetadataHandler
+ * @property {?OpenTagCallBack} onOpenTag
+ * @property {?CloseTagCallBack} onCloseTag
+ * @property {?TextCallBack} onText
+ */
 
-    /**
-     * Called when the opening tag of an element node is encountered.
-     * @callback OpenTagCallBack
-     * @param {string} ns Namespace URI of the element
-     * @param {string} name Local name of the element
-     * @param {Object[]} attributes List of attributes, each consisting of a
-     *                              `uri`, `name` and `value`
-     */
+/**
+ * Called when the opening tag of an element node is encountered.
+ * @callback OpenTagCallBack
+ * @param {string} ns Namespace URI of the element
+ * @param {string} name Local name of the element
+ * @param {Object[]} attributes List of attributes, each consisting of a
+ *                              `uri`, `name` and `value`
+ */
 
-    /**
-     * Called when the closing tag of an element node is encountered.
-     * @callback CloseTagCallBack
-     */
+/**
+ * Called when the closing tag of an element node is encountered.
+ * @callback CloseTagCallBack
+ */
 
-    /**
-     * Called when a text node is encountered.
-     * @callback TextCallBack
-     * @param {string} contents Contents of the text node
-     */
+/**
+ * Called when a text node is encountered.
+ * @callback TextCallBack
+ * @param {string} contents Contents of the text node
+ */
 
-    /**
-     * Parses an IMSC1 document into an opaque in-memory representation that exposes
-     * a single method <pre>getMediaTimeEvents()</pre> that returns a list of time
-     * offsets (in seconds) of the ISD, i.e. the points in time where the visual
-     * representation of the document change. `metadataHandler` allows the caller to
-     * be called back when nodes are present in <metadata> elements. 
-     * 
-     * @param {string} xmlstring XML document
-     * @param {?module:imscUtils.ErrorHandler} errorHandler Error callback
-     * @param {?MetadataHandler} metadataHandler Callback for <Metadata> elements
-     * @returns {Object} Opaque in-memory representation of an IMSC1 document
-     */
+/**
+ * Parses an IMSC1 document into an opaque in-memory representation that exposes
+ * a single method <pre>getMediaTimeEvents()</pre> that returns a list of time
+ * offsets (in seconds) of the ISD, i.e. the points in time where the visual
+ * representation of the document change. `metadataHandler` allows the caller to
+ * be called back when nodes are present in <metadata> elements. 
+ * 
+ * @param {string} xmlstring XML document
+ * @param {?module:imscUtils.ErrorHandler} errorHandler Error callback
+ * @param {?MetadataHandler} metadataHandler Callback for <Metadata> elements
+ * @returns {Object} Opaque in-memory representation of an IMSC1 document
+ */
 
-    imscDoc.fromXML = function (xmlstring, errorHandler, metadataHandler) {
-        var p = sax.parser(true, {xmlns: true});
-        var estack = [];
-        var xmllangstack = [];
-        var xmlspacestack = [];
-        var metadata_depth = 0;
-        var doc = null;
+export function fromXM(xmlstring, errorHandler, metadataHandler) {
+    var p = sax.parser(true, { xmlns: true });
+    var estack = [];
+    var xmllangstack = [];
+    var xmlspacestack = [];
+    var metadata_depth = 0;
+    var doc = null;
 
-        p.onclosetag = function (node) {
+    p.onclosetag = function (node) {
 
-            
-            if (estack[0] instanceof Region) {
 
-                /* merge referenced styles */
+        if (estack[0] instanceof Region) {
 
-                if (doc.head !== null && doc.head.styling !== null) {
-                    mergeReferencedStyles(doc.head.styling, estack[0].styleRefs, estack[0].styleAttrs, errorHandler);
-                }
+            /* merge referenced styles */
 
-                delete estack[0].styleRefs;
+            if (doc.head !== null && doc.head.styling !== null) {
+                mergeReferencedStyles(doc.head.styling, estack[0].styleRefs, estack[0].styleAttrs, errorHandler);
+            }
 
-            } else if (estack[0] instanceof Styling) {
+            delete estack[0].styleRefs;
 
-                /* flatten chained referential styling */
+        } else if (estack[0] instanceof Styling) {
 
-                for (var sid in estack[0].styles) {
+            /* flatten chained referential styling */
 
-                    if (! estack[0].styles.hasOwnProperty(sid)) continue;
+            for (var sid in estack[0].styles) {
 
-                    mergeChainedStyles(estack[0], estack[0].styles[sid], errorHandler);
+                if (!estack[0].styles.hasOwnProperty(sid)) continue;
 
-                }
+                mergeChainedStyles(estack[0], estack[0].styles[sid], errorHandler);
 
-            } else if (estack[0] instanceof P || estack[0] instanceof Span) {
+            }
 
-                /* merge anonymous spans */
+        } else if (estack[0] instanceof P || estack[0] instanceof Span) {
 
-                if (estack[0].contents.length > 1) {
+            /* merge anonymous spans */
 
-                    var cs = [estack[0].contents[0]];
+            if (estack[0].contents.length > 1) {
 
-                    var c;
+                var cs = [estack[0].contents[0]];
 
-                    for (c = 1; c < estack[0].contents.length; c++) {
+                var c;
 
-                        if (estack[0].contents[c] instanceof AnonymousSpan &&
-                                cs[cs.length - 1] instanceof AnonymousSpan) {
+                for (c = 1; c < estack[0].contents.length; c++) {
 
-                            cs[cs.length - 1].text += estack[0].contents[c].text;
+                    if (estack[0].contents[c] instanceof AnonymousSpan &&
+                        cs[cs.length - 1] instanceof AnonymousSpan) {
 
-                        } else {
+                        cs[cs.length - 1].text += estack[0].contents[c].text;
 
-                            cs.push(estack[0].contents[c]);
+                    } else {
 
-                        }
+                        cs.push(estack[0].contents[c]);
 
                     }
 
-                    estack[0].contents = cs;
-
                 }
 
-                // remove redundant nested anonymous spans (9.3.3(1)(c))
+                estack[0].contents = cs;
 
-                if (estack[0] instanceof Span &&
-                        estack[0].contents.length === 1 &&
-                        estack[0].contents[0] instanceof AnonymousSpan) {
+            }
 
-                    estack[0].text = estack[0].contents[0].text;
-                    delete estack[0].contents;
+            // remove redundant nested anonymous spans (9.3.3(1)(c))
 
-                }
+            if (estack[0] instanceof Span &&
+                estack[0].contents.length === 1 &&
+                estack[0].contents[0] instanceof AnonymousSpan) {
 
-            } else if (estack[0] instanceof ForeignElement) {
+                estack[0].text = estack[0].contents[0].text;
+                delete estack[0].contents;
 
-                if (estack[0].node.uri === imscNames.ns_tt &&
-                        estack[0].node.local === 'metadata') {
+            }
 
-                    /* leave the metadata element */
+        } else if (estack[0] instanceof ForeignElement) {
 
-                    metadata_depth--;
+            if (estack[0].node.uri === ns_tt &&
+                estack[0].node.local === 'metadata') {
 
-                } else if (metadata_depth > 0 &&
-                        metadataHandler &&
-                        'onCloseTag' in metadataHandler) {
+                /* leave the metadata element */
 
-                    /* end of child of metadata element */
+                metadata_depth--;
 
-                    metadataHandler.onCloseTag();
+            } else if (metadata_depth > 0 &&
+                metadataHandler &&
+                'onCloseTag' in metadataHandler) {
 
-                }
+                /* end of child of metadata element */
+
+                metadataHandler.onCloseTag();
 
             }
 
-            // TODO: delete stylerefs?
+        }
 
-            // maintain the xml:space stack
+        // TODO: delete stylerefs?
 
-            xmlspacestack.shift();
+        // maintain the xml:space stack
 
-            // maintain the xml:lang stack
+        xmlspacestack.shift();
 
-            xmllangstack.shift();
+        // maintain the xml:lang stack
 
-            // prepare for the next element
+        xmllangstack.shift();
 
-            estack.shift();
-        };
+        // prepare for the next element
 
-        p.ontext = function (str) {
+        estack.shift();
+    };
 
-            if (estack[0] === undefined) {
+    p.ontext = function (str) {
 
-                /* ignoring text outside of elements */
+        if (estack[0] === undefined) {
 
-            } else if (estack[0] instanceof Span || estack[0] instanceof P) {
+            /* ignoring text outside of elements */
 
-                /* ignore children text nodes in ruby container spans */
+        } else if (estack[0] instanceof Span || estack[0] instanceof P) {
 
-                if (estack[0] instanceof Span) {
+            /* ignore children text nodes in ruby container spans */
 
-                    var ruby = estack[0].styleAttrs[imscStyles.byName.ruby.qname];
+            if (estack[0] instanceof Span) {
 
-                    if (ruby === 'container' || ruby === 'textContainer' || ruby === 'baseContainer') {
+                var ruby = estack[0].styleAttrs[byName.ruby.qname];
 
-                        return;
+                if (ruby === 'container' || ruby === 'textContainer' || ruby === 'baseContainer') {
 
-                    }
+                    return;
 
                 }
 
-                /* create an anonymous span */
+            }
 
-                var s = new AnonymousSpan();
+            /* create an anonymous span */
 
-                s.initFromText(doc, estack[0], str, xmllangstack[0], xmlspacestack[0], errorHandler);
+            var s = new AnonymousSpan();
 
-                estack[0].contents.push(s);
+            s.initFromText(doc, estack[0], str, xmllangstack[0], xmlspacestack[0], errorHandler);
 
-            } else if (estack[0] instanceof ForeignElement &&
-                    metadata_depth > 0 &&
-                    metadataHandler &&
-                    'onText' in metadataHandler) {
+            estack[0].contents.push(s);
 
-                /* text node within a child of metadata element */
+        } else if (estack[0] instanceof ForeignElement &&
+            metadata_depth > 0 &&
+            metadataHandler &&
+            'onText' in metadataHandler) {
 
-                metadataHandler.onText(str);
+            /* text node within a child of metadata element */
 
-            }
+            metadataHandler.onText(str);
 
-        };
+        }
 
+    };
 
-        p.onopentag = function (node) {
 
-            // maintain the xml:space stack
+    p.onopentag = function (node) {
 
-            var xmlspace = node.attributes["xml:space"];
+        // maintain the xml:space stack
 
-            if (xmlspace) {
+        var xmlspace = node.attributes["xml:space"];
 
-                xmlspacestack.unshift(xmlspace.value);
+        if (xmlspace) {
 
-            } else {
+            xmlspacestack.unshift(xmlspace.value);
 
-                if (xmlspacestack.length === 0) {
+        } else {
 
-                    xmlspacestack.unshift("default");
+            if (xmlspacestack.length === 0) {
 
-                } else {
+                xmlspacestack.unshift("default");
 
-                    xmlspacestack.unshift(xmlspacestack[0]);
+            } else {
 
-                }
+                xmlspacestack.unshift(xmlspacestack[0]);
 
             }
 
-            /* maintain the xml:lang stack */
+        }
 
+        /* maintain the xml:lang stack */
 
-            var xmllang = node.attributes["xml:lang"];
 
-            if (xmllang) {
+        var xmllang = node.attributes["xml:lang"];
 
-                xmllangstack.unshift(xmllang.value);
+        if (xmllang) {
 
-            } else {
+            xmllangstack.unshift(xmllang.value);
 
-                if (xmllangstack.length === 0) {
+        } else {
 
-                    xmllangstack.unshift("");
+            if (xmllangstack.length === 0) {
 
-                } else {
+                xmllangstack.unshift("");
 
-                    xmllangstack.unshift(xmllangstack[0]);
+            } else {
 
-                }
+                xmllangstack.unshift(xmllangstack[0]);
 
             }
 
+        }
 
-            /* process the element */
 
-            if (node.uri === imscNames.ns_tt) {
+        /* process the element */
 
-                if (node.local === 'tt') {
+        if (node.uri === ns_tt) {
 
-                    if (doc !== null) {
+            if (node.local === 'tt') {
 
-                        reportFatal(errorHandler, "Two <tt> elements at (" + this.line + "," + this.column + ")");
+                if (doc !== null) {
 
-                    }
+                    reportFatal(errorHandler, "Two <tt> elements at (" + this.line + "," + this.column + ")");
 
-                    doc = new TT();
+                }
 
-                    doc.initFromNode(node, xmllangstack[0], errorHandler);
+                doc = new TT();
 
-                    estack.unshift(doc);
+                doc.initFromNode(node, xmllangstack[0], errorHandler);
 
-                } else if (node.local === 'head') {
+                estack.unshift(doc);
 
-                    if (!(estack[0] instanceof TT)) {
-                        reportFatal(errorHandler, "Parent of <head> element is not <tt> at (" + this.line + "," + this.column + ")");
-                    }
+            } else if (node.local === 'head') {
 
-                    estack.unshift(doc.head);
+                if (!(estack[0] instanceof TT)) {
+                    reportFatal(errorHandler, "Parent of <head> element is not <tt> at (" + this.line + "," + this.column + ")");
+                }
 
-                } else if (node.local === 'styling') {
+                estack.unshift(doc.head);
 
-                    if (!(estack[0] instanceof Head)) {
-                        reportFatal(errorHandler, "Parent of <styling> element is not <head> at (" + this.line + "," + this.column + ")");
-                    }
+            } else if (node.local === 'styling') {
 
-                    estack.unshift(doc.head.styling);
+                if (!(estack[0] instanceof Head)) {
+                    reportFatal(errorHandler, "Parent of <styling> element is not <head> at (" + this.line + "," + this.column + ")");
+                }
 
-                } else if (node.local === 'style') {
+                estack.unshift(doc.head.styling);
 
-                    var s;
+            } else if (node.local === 'style') {
 
-                    if (estack[0] instanceof Styling) {
+                var s;
 
-                        s = new Style();
+                if (estack[0] instanceof Styling) {
 
-                        s.initFromNode(node, errorHandler);
+                    s = new Style();
 
-                        /* ignore <style> element missing @id */
+                    s.initFromNode(node, errorHandler);
 
-                        if (!s.id) {
+                    /* ignore <style> element missing @id */
 
-                            reportError(errorHandler, "<style> element missing @id attribute");
+                    if (!s.id) {
 
-                        } else {
+                        reportError(errorHandler, "<style> element missing @id attribute");
 
-                            doc.head.styling.styles[s.id] = s;
+                    } else {
 
-                        }
+                        doc.head.styling.styles[s.id] = s;
 
-                        estack.unshift(s);
+                    }
 
-                    } else if (estack[0] instanceof Region) {
+                    estack.unshift(s);
 
-                        /* nested styles can be merged with specified styles
-                         * immediately, with lower priority
-                         * (see 8.4.4.2(3) at TTML1 )
-                         */
+                } else if (estack[0] instanceof Region) {
 
-                        s = new Style();
+                    /* nested styles can be merged with specified styles
+                     * immediately, with lower priority
+                     * (see 8.4.4.2(3) at TTML1 )
+                     */
 
-                        s.initFromNode(node, errorHandler);
+                    s = new Style();
 
-                        mergeStylesIfNotPresent(s.styleAttrs, estack[0].styleAttrs);
+                    s.initFromNode(node, errorHandler);
 
-                        estack.unshift(s);
+                    mergeStylesIfNotPresent(s.styleAttrs, estack[0].styleAttrs);
 
-                    } else {
+                    estack.unshift(s);
 
-                        reportFatal(errorHandler, "Parent of <style> element is not <styling> or <region> at (" + this.line + "," + this.column + ")");
+                } else {
 
-                    }
+                    reportFatal(errorHandler, "Parent of <style> element is not <styling> or <region> at (" + this.line + "," + this.column + ")");
 
-                }  else if (node.local === 'initial') {
+                }
 
-                    var ini;
+            } else if (node.local === 'initial') {
 
-                    if (estack[0] instanceof Styling) {
+                var ini;
 
-                        ini = new Initial();
+                if (estack[0] instanceof Styling) {
 
-                        ini.initFromNode(node, errorHandler);
-                        
-                        for (var qn in ini.styleAttrs) {
+                    ini = new Initial();
 
-                            if (! ini.styleAttrs.hasOwnProperty(qn)) continue;
-                            
-                            doc.head.styling.initials[qn] = ini.styleAttrs[qn];
-                            
-                        }
-                        
-                        estack.unshift(ini);
+                    ini.initFromNode(node, errorHandler);
 
-                    } else {
+                    for (var qn in ini.styleAttrs) {
+
+                        if (!ini.styleAttrs.hasOwnProperty(qn)) continue;
 
-                        reportFatal(errorHandler, "Parent of <initial> element is not <styling> at (" + this.line + "," + this.column + ")");
+                        doc.head.styling.initials[qn] = ini.styleAttrs[qn];
 
                     }
 
-                } else if (node.local === 'layout') {
+                    estack.unshift(ini);
 
-                    if (!(estack[0] instanceof Head)) {
+                } else {
 
-                        reportFatal(errorHandler, "Parent of <layout> element is not <head> at " + this.line + "," + this.column + ")");
+                    reportFatal(errorHandler, "Parent of <initial> element is not <styling> at (" + this.line + "," + this.column + ")");
 
-                    }
+                }
 
-                    estack.unshift(doc.head.layout);
+            } else if (node.local === 'layout') {
 
-                } else if (node.local === 'region') {
+                if (!(estack[0] instanceof Head)) {
 
-                    if (!(estack[0] instanceof Layout)) {
-                        reportFatal(errorHandler, "Parent of <region> element is not <layout> at " + this.line + "," + this.column + ")");
-                    }
+                    reportFatal(errorHandler, "Parent of <layout> element is not <head> at " + this.line + "," + this.column + ")");
 
-                    var r = new Region();
+                }
 
-                    r.initFromNode(doc, node, xmllangstack[0], errorHandler);
+                estack.unshift(doc.head.layout);
 
-                    if (!r.id || r.id in doc.head.layout.regions) {
+            } else if (node.local === 'region') {
 
-                        reportError(errorHandler, "Ignoring <region> with duplicate or missing @id at " + this.line + "," + this.column + ")");
+                if (!(estack[0] instanceof Layout)) {
+                    reportFatal(errorHandler, "Parent of <region> element is not <layout> at " + this.line + "," + this.column + ")");
+                }
 
-                    } else {
+                var r = new Region();
 
-                        doc.head.layout.regions[r.id] = r;
+                r.initFromNode(doc, node, xmllangstack[0], errorHandler);
 
-                    }
+                if (!r.id || r.id in doc.head.layout.regions) {
 
-                    estack.unshift(r);
+                    reportError(errorHandler, "Ignoring <region> with duplicate or missing @id at " + this.line + "," + this.column + ")");
 
-                } else if (node.local === 'body') {
+                } else {
 
-                    if (!(estack[0] instanceof TT)) {
+                    doc.head.layout.regions[r.id] = r;
 
-                        reportFatal(errorHandler, "Parent of <body> element is not <tt> at " + this.line + "," + this.column + ")");
+                }
 
-                    }
+                estack.unshift(r);
 
-                    if (doc.body !== null) {
+            } else if (node.local === 'body') {
 
-                        reportFatal(errorHandler, "Second <body> element at " + this.line + "," + this.column + ")");
+                if (!(estack[0] instanceof TT)) {
 
-                    }
+                    reportFatal(errorHandler, "Parent of <body> element is not <tt> at " + this.line + "," + this.column + ")");
 
-                    var b = new Body();
+                }
 
-                    b.initFromNode(doc, node, xmllangstack[0], errorHandler);
+                if (doc.body !== null) {
 
-                    doc.body = b;
+                    reportFatal(errorHandler, "Second <body> element at " + this.line + "," + this.column + ")");
 
-                    estack.unshift(b);
+                }
 
-                } else if (node.local === 'div') {
+                var b = new Body();
 
-                    if (!(estack[0] instanceof Div || estack[0] instanceof Body)) {
+                b.initFromNode(doc, node, xmllangstack[0], errorHandler);
 
-                        reportFatal(errorHandler, "Parent of <div> element is not <body> or <div> at " + this.line + "," + this.column + ")");
+                doc.body = b;
 
-                    }
+                estack.unshift(b);
 
-                    var d = new Div();
-
-                    d.initFromNode(doc, estack[0], node, xmllangstack[0], errorHandler);
-                    
-                    /* transform smpte:backgroundImage to TTML2 image element */
-                    
-                    var bi = d.styleAttrs[imscStyles.byName.backgroundImage.qname];
-                    
-                    if (bi) {
-                        d.contents.push(new Image(bi));
-                        delete d.styleAttrs[imscStyles.byName.backgroundImage.qname];                  
-                    }
+            } else if (node.local === 'div') {
 
-                    estack[0].contents.push(d);
+                if (!(estack[0] instanceof Div || estack[0] instanceof Body)) {
 
-                    estack.unshift(d);
+                    reportFatal(errorHandler, "Parent of <div> element is not <body> or <div> at " + this.line + "," + this.column + ")");
 
-                } else if (node.local === 'image') {
+                }
 
-                    if (!(estack[0] instanceof Div)) {
+                var d = new Div();
 
-                        reportFatal(errorHandler, "Parent of <image> element is not <div> at " + this.line + "," + this.column + ")");
+                d.initFromNode(doc, estack[0], node, xmllangstack[0], errorHandler);
 
-                    }
+                /* transform smpte:backgroundImage to TTML2 image element */
 
-                    var img = new Image();
-                    
-                    img.initFromNode(doc, estack[0], node, xmllangstack[0], errorHandler);
-                    
-                    estack[0].contents.push(img);
+                var bi = d.styleAttrs[byName.backgroundImage.qname];
 
-                    estack.unshift(img);
+                if (bi) {
+                    d.contents.push(new Image(bi));
+                    delete d.styleAttrs[byName.backgroundImage.qname];
+                }
 
-                } else if (node.local === 'p') {
+                estack[0].contents.push(d);
 
-                    if (!(estack[0] instanceof Div)) {
+                estack.unshift(d);
 
-                        reportFatal(errorHandler, "Parent of <p> element is not <div> at " + this.line + "," + this.column + ")");
+            } else if (node.local === 'image') {
 
-                    }
+                if (!(estack[0] instanceof Div)) {
 
-                    var p = new P();
+                    reportFatal(errorHandler, "Parent of <image> element is not <div> at " + this.line + "," + this.column + ")");
 
-                    p.initFromNode(doc, estack[0], node, xmllangstack[0], errorHandler);
+                }
 
-                    estack[0].contents.push(p);
+                var img = new Image();
 
-                    estack.unshift(p);
+                img.initFromNode(doc, estack[0], node, xmllangstack[0], errorHandler);
 
-                } else if (node.local === 'span') {
+                estack[0].contents.push(img);
 
-                    if (!(estack[0] instanceof Span || estack[0] instanceof P)) {
+                estack.unshift(img);
 
-                        reportFatal(errorHandler, "Parent of <span> element is not <span> or <p> at " + this.line + "," + this.column + ")");
+            } else if (node.local === 'p') {
 
-                    }
+                if (!(estack[0] instanceof Div)) {
 
-                    var ns = new Span();
+                    reportFatal(errorHandler, "Parent of <p> element is not <div> at " + this.line + "," + this.column + ")");
 
-                    ns.initFromNode(doc, estack[0], node, xmllangstack[0], xmlspacestack[0], errorHandler);
+                }
 
-                    estack[0].contents.push(ns);
+                var p = new P();
 
-                    estack.unshift(ns);
+                p.initFromNode(doc, estack[0], node, xmllangstack[0], errorHandler);
 
-                } else if (node.local === 'br') {
+                estack[0].contents.push(p);
 
-                    if (!(estack[0] instanceof Span || estack[0] instanceof P)) {
+                estack.unshift(p);
 
-                        reportFatal(errorHandler, "Parent of <br> element is not <span> or <p> at " + this.line + "," + this.column + ")");
+            } else if (node.local === 'span') {
 
-                    }
+                if (!(estack[0] instanceof Span || estack[0] instanceof P)) {
 
-                    var nb = new Br();
+                    reportFatal(errorHandler, "Parent of <span> element is not <span> or <p> at " + this.line + "," + this.column + ")");
 
-                    nb.initFromNode(doc, estack[0], node, xmllangstack[0], errorHandler);
+                }
 
-                    estack[0].contents.push(nb);
+                var ns = new Span();
 
-                    estack.unshift(nb);
+                ns.initFromNode(doc, estack[0], node, xmllangstack[0], xmlspacestack[0], errorHandler);
 
-                } else if (node.local === 'set') {
+                estack[0].contents.push(ns);
 
-                    if (!(estack[0] instanceof Span ||
-                            estack[0] instanceof P ||
-                            estack[0] instanceof Div ||
-                            estack[0] instanceof Body ||
-                            estack[0] instanceof Region ||
-                            estack[0] instanceof Br)) {
+                estack.unshift(ns);
 
-                        reportFatal(errorHandler, "Parent of <set> element is not a content element or a region at " + this.line + "," + this.column + ")");
+            } else if (node.local === 'br') {
 
-                    }
+                if (!(estack[0] instanceof Span || estack[0] instanceof P)) {
+
+                    reportFatal(errorHandler, "Parent of <br> element is not <span> or <p> at " + this.line + "," + this.column + ")");
 
-                    var st = new Set();
+                }
 
-                    st.initFromNode(doc, estack[0], node, errorHandler);
+                var nb = new Br();
 
-                    estack[0].sets.push(st);
+                nb.initFromNode(doc, estack[0], node, xmllangstack[0], errorHandler);
 
-                    estack.unshift(st);
+                estack[0].contents.push(nb);
 
-                } else {
+                estack.unshift(nb);
+
+            } else if (node.local === 'set') {
 
-                    /* element in the TT namespace, but not a content element */
+                if (!(estack[0] instanceof Span ||
+                    estack[0] instanceof P ||
+                    estack[0] instanceof Div ||
+                    estack[0] instanceof Body ||
+                    estack[0] instanceof Region ||
+                    estack[0] instanceof Br)) {
+
+                    reportFatal(errorHandler, "Parent of <set> element is not a content element or a region at " + this.line + "," + this.column + ")");
 
-                    estack.unshift(new ForeignElement(node));
                 }
 
+                var st = new Set();
+
+                st.initFromNode(doc, estack[0], node, errorHandler);
+
+                estack[0].sets.push(st);
+
+                estack.unshift(st);
+
             } else {
 
-                /* ignore elements not in the TTML namespace unless in metadata element */
+                /* element in the TT namespace, but not a content element */
 
                 estack.unshift(new ForeignElement(node));
-
             }
 
-            /* handle metadata callbacks */
+        } else {
 
-            if (estack[0] instanceof ForeignElement) {
+            /* ignore elements not in the TTML namespace unless in metadata element */
 
-                if (node.uri === imscNames.ns_tt &&
-                        node.local === 'metadata') {
+            estack.unshift(new ForeignElement(node));
 
-                    /* enter the metadata element */
+        }
 
-                    metadata_depth++;
+        /* handle metadata callbacks */
 
-                } else if (
-                        metadata_depth > 0 &&
-                        metadataHandler &&
-                        'onOpenTag' in metadataHandler
-                        ) {
+        if (estack[0] instanceof ForeignElement) {
 
-                    /* start of child of metadata element */
+            if (node.uri === ns_tt &&
+                node.local === 'metadata') {
 
-                    var attrs = [];
+                /* enter the metadata element */
 
-                    for (var a in node.attributes) {
-                        attrs[node.attributes[a].uri + " " + node.attributes[a].local] =
-                                {
-                                    uri: node.attributes[a].uri,
-                                    local: node.attributes[a].local,
-                                    value: node.attributes[a].value
-                                };
-                    }
+                metadata_depth++;
 
-                    metadataHandler.onOpenTag(node.uri, node.local, attrs);
+            } else if (
+                metadata_depth > 0 &&
+                metadataHandler &&
+                'onOpenTag' in metadataHandler
+            ) {
 
+                /* start of child of metadata element */
+
+                var attrs = [];
+
+                for (var a in node.attributes) {
+                    attrs[node.attributes[a].uri + " " + node.attributes[a].local] =
+                    {
+                        uri: node.attributes[a].uri,
+                        local: node.attributes[a].local,
+                        value: node.attributes[a].value
+                    };
                 }
 
+                metadataHandler.onOpenTag(node.uri, node.local, attrs);
+
             }
 
-        };
+        }
 
-        // parse the document
+    };
 
-        p.write(xmlstring).close();
+    // parse the document
 
-        // all referential styling has been flatten, so delete styles
+    p.write(xmlstring).close();
 
-        delete doc.head.styling.styles;
-       
-        // create default region if no regions specified
+    // all referential styling has been flatten, so delete styles
 
-        var hasRegions = false;
+    delete doc.head.styling.styles;
 
-        /* AFAIK the only way to determine whether an object has members */
+    // create default region if no regions specified
 
-        for (var i in doc.head.layout.regions) {
+    var hasRegions = false;
 
-            if (doc.head.layout.regions.hasOwnProperty(i)) {
-                hasRegions = true;
-                break;
-            }
+    /* AFAIK the only way to determine whether an object has members */
+
+    for (var i in doc.head.layout.regions) {
 
+        if (doc.head.layout.regions.hasOwnProperty(i)) {
+            hasRegions = true;
+            break;
         }
 
-        if (!hasRegions) {
+    }
 
-            /* create default region */
+    if (!hasRegions) {
 
-            var dr = Region.prototype.createDefaultRegion(doc.lang);
+        /* create default region */
 
-            doc.head.layout.regions[dr.id] = dr;
+        var dr = Region.createDefaultRegion(doc.lang);
 
-        }
+        doc.head.layout.regions[dr.id] = dr;
 
-        /* resolve desired timing for regions */
+    }
 
-        for (var region_i in doc.head.layout.regions) {
+    /* resolve desired timing for regions */
 
-            if (! doc.head.layout.regions.hasOwnProperty(region_i)) continue;
+    for (var region_i in doc.head.layout.regions) {
 
-            resolveTiming(doc, doc.head.layout.regions[region_i], null, null);
+        if (!doc.head.layout.regions.hasOwnProperty(region_i)) continue;
 
-        }
+        resolveTiming(doc, doc.head.layout.regions[region_i], null, null);
 
-        /* resolve desired timing for content elements */
+    }
 
-        if (doc.body) {
-            resolveTiming(doc, doc.body, null, null);
-        }
+    /* resolve desired timing for content elements */
 
-        /* remove undefined spans in ruby containers */
+    if (doc.body) {
+        resolveTiming(doc, doc.body, null, null);
+    }
 
-        if (doc.body) {
-            cleanRubyContainers(doc.body);
-        }
+    /* remove undefined spans in ruby containers */
 
-        return doc;
-    };
+    if (doc.body) {
+        cleanRubyContainers(doc.body);
+    }
 
-    function cleanRubyContainers(element) {
-        
-        if (! ('contents' in element)) return;
+    return doc;
+};
 
-        var rubyval = 'styleAttrs' in element ? element.styleAttrs[imscStyles.byName.ruby.qname] : null;
+function cleanRubyContainers(element) {
 
-        var isrubycontainer = (element.kind === 'span' && (rubyval === "container" || rubyval === "textContainer" || rubyval === "baseContainer"));
+    if (!('contents' in element)) return;
 
-        for (var i = element.contents.length - 1; i >= 0; i--) {
+    var rubyval = 'styleAttrs' in element ? element.styleAttrs[byName.ruby.qname] : null;
 
-            if (isrubycontainer && !('styleAttrs' in element.contents[i] && imscStyles.byName.ruby.qname in element.contents[i].styleAttrs)) {
+    var isrubycontainer = (element.kind === 'span' && (rubyval === "container" || rubyval === "textContainer" || rubyval === "baseContainer"));
 
-                /* prune undefined <span> in ruby containers */
+    for (var i = element.contents.length - 1; i >= 0; i--) {
 
-                delete element.contents[i];
+        if (isrubycontainer && !('styleAttrs' in element.contents[i] && byName.ruby.qname in element.contents[i].styleAttrs)) {
 
-            } else {
+            /* prune undefined <span> in ruby containers */
 
-                cleanRubyContainers(element.contents[i]);
+            delete element.contents[i];
 
-            }
+        } else {
+
+            cleanRubyContainers(element.contents[i]);
 
         }
 
     }
 
-    function resolveTiming(doc, element, prev_sibling, parent) {
+}
 
-        /* are we in a seq container? */
+function resolveTiming(doc, element, prev_sibling, parent) {
 
-        var isinseq = parent && parent.timeContainer === "seq";
+    /* are we in a seq container? */
 
-        /* determine implicit begin */
+    var isinseq = parent && parent.timeContainer === "seq";
 
-        var implicit_begin = 0; /* default */
+    /* determine implicit begin */
 
-        if (parent) {
+    var implicit_begin = 0; /* default */
 
-            if (isinseq && prev_sibling) {
+    if (parent) {
 
-                /*
-                 * if seq time container, offset from the previous sibling end
-                 */
+        if (isinseq && prev_sibling) {
 
-                implicit_begin = prev_sibling.end;
+            /*
+             * if seq time container, offset from the previous sibling end
+             */
 
+            implicit_begin = prev_sibling.end;
 
-            } else {
 
-                implicit_begin = parent.begin;
+        } else {
 
-            }
+            implicit_begin = parent.begin;
 
         }
 
-        /* compute desired begin */
-
-        element.begin = element.explicit_begin ? element.explicit_begin + implicit_begin : implicit_begin;
+    }
 
+    /* compute desired begin */
 
-        /* determine implicit end */
+    element.begin = element.explicit_begin ? element.explicit_begin + implicit_begin : implicit_begin;
 
-        var implicit_end = element.begin;
 
-        var s = null;
+    /* determine implicit end */
 
-        if ("sets" in element) {
+    var implicit_end = element.begin;
 
-            for (var set_i = 0; set_i < element.sets.length; set_i++) {
+    var s = null;
 
-                resolveTiming(doc, element.sets[set_i], s, element);
+    if ("sets" in element) {
 
-                if (element.timeContainer === "seq") {
+        for (var set_i = 0; set_i < element.sets.length; set_i++) {
 
-                    implicit_end = element.sets[set_i].end;
+            resolveTiming(doc, element.sets[set_i], s, element);
 
-                } else {
+            if (element.timeContainer === "seq") {
 
-                    implicit_end = Math.max(implicit_end, element.sets[set_i].end);
+                implicit_end = element.sets[set_i].end;
 
-                }
+            } else {
 
-                s = element.sets[set_i];
+                implicit_end = Math.max(implicit_end, element.sets[set_i].end);
 
             }
 
+            s = element.sets[set_i];
+
         }
 
-        if (!('contents' in element)) {
+    }
 
-            /* anonymous spans and regions and <set> and <br>s and spans with only children text nodes */
+    if (!('contents' in element)) {
 
-            if (isinseq) {
+        /* anonymous spans and regions and <set> and <br>s and spans with only children text nodes */
 
-                /* in seq container, implicit duration is zero */
+        if (isinseq) {
 
-                implicit_end = element.begin;
+            /* in seq container, implicit duration is zero */
 
-            } else {
+            implicit_end = element.begin;
 
-                /* in par container, implicit duration is indefinite */
+        } else {
 
-                implicit_end = Number.POSITIVE_INFINITY;
+            /* in par container, implicit duration is indefinite */
 
-            }
+            implicit_end = Number.POSITIVE_INFINITY;
 
-        } else if ("contents" in element) {
- 
-            for (var content_i = 0; content_i < element.contents.length; content_i++) {
+        }
 
-                resolveTiming(doc, element.contents[content_i], s, element);
+    } else if ("contents" in element) {
 
-                if (element.timeContainer === "seq") {
+        for (var content_i = 0; content_i < element.contents.length; content_i++) {
 
-                    implicit_end = element.contents[content_i].end;
+            resolveTiming(doc, element.contents[content_i], s, element);
 
-                } else {
+            if (element.timeContainer === "seq") {
 
-                    implicit_end = Math.max(implicit_end, element.contents[content_i].end);
+                implicit_end = element.contents[content_i].end;
 
-                }
+            } else {
 
-                s = element.contents[content_i];
+                implicit_end = Math.max(implicit_end, element.contents[content_i].end);
 
             }
 
+            s = element.contents[content_i];
+
         }
 
-        /* determine desired end */
-        /* it is never made really clear in SMIL that the explicit end is offset by the implicit begin */
+    }
 
-        if (element.explicit_end !== null && element.explicit_dur !== null) {
+    /* determine desired end */
+    /* it is never made really clear in SMIL that the explicit end is offset by the implicit begin */
 
-            element.end = Math.min(element.begin + element.explicit_dur, implicit_begin + element.explicit_end);
+    if (element.explicit_end !== null && element.explicit_dur !== null) {
 
-        } else if (element.explicit_end === null && element.explicit_dur !== null) {
+        element.end = Math.min(element.begin + element.explicit_dur, implicit_begin + element.explicit_end);
 
-            element.end = element.begin + element.explicit_dur;
+    } else if (element.explicit_end === null && element.explicit_dur !== null) {
 
-        } else if (element.explicit_end !== null && element.explicit_dur === null) {
+        element.end = element.begin + element.explicit_dur;
 
-            element.end = implicit_begin + element.explicit_end;
+    } else if (element.explicit_end !== null && element.explicit_dur === null) {
 
-        } else {
+        element.end = implicit_begin + element.explicit_end;
 
-            element.end = implicit_end;
-        }
+    } else {
 
-        delete element.explicit_begin;
-        delete element.explicit_dur;
-        delete element.explicit_end;
+        element.end = implicit_end;
+    }
 
-        doc._registerEvent(element);
+    delete element.explicit_begin;
+    delete element.explicit_dur;
+    delete element.explicit_end;
 
-    }
+    doc._registerEvent(element);
 
-    function ForeignElement(node) {
+}
+
+class ForeignElement {
+    constructor(node) {
         this.node = node;
     }
+}
 
-    function TT() {
+class TT {
+    constructor() {
         this.events = [];
         this.head = new Head();
         this.body = null;
     }
 
-    TT.prototype.initFromNode = function (node, xmllang, errorHandler) {
+    initFromNode(node, xmllang, errorHandler) {
 
         /* compute cell resolution */
 
         var cr = extractCellResolution(node, errorHandler);
-        
+
         this.cellLength = {
-                'h': new imscUtils.ComputedLength(0, 1/cr.h),
-                'w': new imscUtils.ComputedLength(1/cr.w, 0)
-            };
+            'h': new ComputedLength(0, 1 / cr.h),
+            'w': new ComputedLength(1 / cr.w, 0)
+        };
 
         /* extract frame rate and tick rate */
 
@@ -845,7 +851,7 @@
 
         /* check timebase */
 
-        var attr = findAttribute(node, imscNames.ns_ttp, "timeBase");
+        var attr = findAttribute(node, ns_ttp, "timeBase");
 
         if (attr !== null && attr !== "media") {
 
@@ -871,18 +877,18 @@
             }
 
             this.pxLength = {
-                'h': new imscUtils.ComputedLength(0, 1 / e.h.value),
-                'w': new imscUtils.ComputedLength(1 / e.w.value, 0)
+                'h': new ComputedLength(0, 1 / e.h.value),
+                'w': new ComputedLength(1 / e.w.value, 0)
             };
         }
-        
+
         /** set root container dimensions to (1, 1) arbitrarily
           * the root container is mapped to actual dimensions at rendering
         **/
-        
+
         this.dimensions = {
-                'h': new imscUtils.ComputedLength(0, 1),
-                'w': new imscUtils.ComputedLength(1, 0)
+            'h': new ComputedLength(0, 1),
+            'w': new ComputedLength(1, 0)
 
         };
 
@@ -890,10 +896,10 @@
 
         this.lang = xmllang;
 
-    };
+    }
 
     /* register a temporal events */
-    TT.prototype._registerEvent = function (elem) {
+    _registerEvent(elem) {
 
         /* skip if begin is not < then end */
 
@@ -920,8 +926,7 @@
 
         }
 
-    };
-
+    }
 
     /*
      * Retrieves the range of ISD times covered by the document
@@ -929,7 +934,7 @@
      * @returns {Array} Array of two elements: min_begin_time and max_begin_time
      * 
      */
-    TT.prototype.getMediaTimeRange = function () {
+    getMediaTimeRange() {
 
         return [this.events[0], this.events[this.events.length - 1]];
     };
@@ -939,142 +944,163 @@
      * 
      * @returns {Array}
      */
-    TT.prototype.getMediaTimeEvents = function () {
+    getMediaTimeEvents() {
 
         return this.events;
     };
+}
 
-    /*
-     * Represents a TTML Head element
-     */
 
-    function Head() {
+/*
+ * Represents a TTML Head element
+ */
+
+class Head {
+    constructor() {
         this.styling = new Styling();
         this.layout = new Layout();
     }
+}
 
-    /*
-     * Represents a TTML Styling element
-     */
+/*
+ * Represents a TTML Styling element
+ */
 
-    function Styling() {
+class Styling {
+    constructor() {
         this.styles = {};
         this.initials = {};
     }
+}
 
-    /*
-     * Represents a TTML Style element
-     */
+/*
+ * Represents a TTML Style element
+ */
 
-    function Style() {
+class Style {
+    constructor() {
         this.id = null;
         this.styleAttrs = null;
         this.styleRefs = null;
     }
 
-    Style.prototype.initFromNode = function (node, errorHandler) {
+    initFromNode(node, errorHandler) {
         this.id = elementGetXMLID(node);
         this.styleAttrs = elementGetStyles(node, errorHandler);
         this.styleRefs = elementGetStyleRefs(node);
     };
-    
-    /*
-     * Represents a TTML initial element
-     */
+}
+
+/*
+ * Represents a TTML initial element
+ */
 
-    function Initial() {
+class Initial {
+    constructor() {
         this.styleAttrs = null;
     }
 
-    Initial.prototype.initFromNode = function (node, errorHandler) {
-        
+    initFromNode(node, errorHandler) {
+
         this.styleAttrs = {};
-        
+
         for (var i in node.attributes) {
 
-            if (node.attributes[i].uri === imscNames.ns_itts ||
-                node.attributes[i].uri === imscNames.ns_ebutts ||
-                node.attributes[i].uri === imscNames.ns_tts) {
-                
+            if (node.attributes[i].uri === ns_itts ||
+                node.attributes[i].uri === ns_ebutts ||
+                node.attributes[i].uri === ns_tts) {
+
                 var qname = node.attributes[i].uri + " " + node.attributes[i].local;
-                
+
                 this.styleAttrs[qname] = node.attributes[i].value;
 
             }
         }
-        
-    };
 
-    /*
-     * Represents a TTML Layout element
-     * 
-     */
+    }
+}
+
+/*
+ * Represents a TTML Layout element
+ * 
+ */
 
-    function Layout() {
+class Layout {
+    constructor() {
         this.regions = {};
     }
-    
-    /*
-     * Represents a TTML image element
-     */
+}
+
+/*
+ * Represents a TTML image element
+ */
 
-    function Image(src, type) {
+class Image {
+    constructor(src, type) {
         ContentElement.call(this, 'image');
         this.src = src;
         this.type = type;
     }
 
-    Image.prototype.initFromNode = function (doc, parent, node, xmllang, errorHandler) {
+    initFromNode(doc, parent, node, xmllang, errorHandler) {
         this.src = 'src' in node.attributes ? node.attributes.src.value : null;
-        
-        if (! this.src) {
+
+        if (!this.src) {
             reportError(errorHandler, "Invalid image@src attribute");
         }
-        
+
         this.type = 'type' in node.attributes ? node.attributes.type.value : null;
-        
-        if (! this.type) {
+
+        if (!this.type) {
             reportError(errorHandler, "Invalid image@type attribute");
         }
-        
+
         StyledElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
         TimedElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
         AnimatedElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
         LayoutElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
 
         this.lang = xmllang;
-    };
+    }
+}
 
-    /*
-     * TTML element utility functions
-     * 
-     */
+/*
+ * TTML element utility functions
+ * 
+ */
 
-    function ContentElement(kind) {
+class ContentElement {
+    constructor(kind) {
         this.kind = kind;
     }
+}
 
-    function IdentifiedElement(id) {
+class IdentifiedElement {
+    constructor(id) {
         this.id = id;
     }
 
-    IdentifiedElement.prototype.initFromNode = function (doc, parent, node, errorHandler) {
+    initFromNode(doc, parent, node, errorHandler) {
         this.id = elementGetXMLID(node);
-    };
+    }
+}
 
-    function LayoutElement(id) {
+class LayoutElement {
+    constructor(id) {
         this.regionID = id;
     }
 
-    LayoutElement.prototype.initFromNode = function (doc, parent, node, errorHandler) {
+    initFromNode(doc, parent, node, errorHandler) {
         this.regionID = elementGetRegionID(node);
-    };
+    }
+}
 
-    function StyledElement(styleAttrs) {
+class StyledElement {
+    constructor(styleAttrs) {
         this.styleAttrs = styleAttrs;
     }
 
-    StyledElement.prototype.initFromNode = function (doc, parent, node, errorHandler) {
+    initFromNode(doc, parent, node, errorHandler) {
 
         this.styleAttrs = elementGetStyles(node, errorHandler);
 
@@ -1082,52 +1108,60 @@
             mergeReferencedStyles(doc.head.styling, elementGetStyleRefs(node), this.styleAttrs, errorHandler);
         }
 
-    };
+    }
+}
 
-    function AnimatedElement(sets) {
+class AnimatedElement {
+    constructor(sets) {
         this.sets = sets;
     }
 
-    AnimatedElement.prototype.initFromNode = function (doc, parent, node, errorHandler) {
+    initFromNode(doc, parent, node, errorHandler) {
         this.sets = [];
-    };
+    }
+}
 
-    function ContainerElement(contents) {
+class ContainerElement {
+    constructor(contents) {
         this.contents = contents;
     }
 
-    ContainerElement.prototype.initFromNode = function (doc, parent, node, errorHandler) {
+    initFromNode(doc, parent, node, errorHandler) {
         this.contents = [];
-    };
+    }
+}
 
-    function TimedElement(explicit_begin, explicit_end, explicit_dur) {
+class TimedElement {
+    constructor(explicit_begin, explicit_end, explicit_dur) {
         this.explicit_begin = explicit_begin;
         this.explicit_end = explicit_end;
         this.explicit_dur = explicit_dur;
     }
 
-    TimedElement.prototype.initFromNode = function (doc, parent, node, errorHandler) {
+    initFromNode(doc, parent, node, errorHandler) {
         var t = processTiming(doc, parent, node, errorHandler);
         this.explicit_begin = t.explicit_begin;
         this.explicit_end = t.explicit_end;
         this.explicit_dur = t.explicit_dur;
 
         this.timeContainer = elementGetTimeContainer(node, errorHandler);
-    };
+    }
+}
 
 
-    /*
-     * Represents a TTML body element
-     */
+/*
+ * Represents a TTML body element
+ */
 
 
 
-    function Body() {
+class Body {
+    constructor() {
         ContentElement.call(this, 'body');
     }
 
 
-    Body.prototype.initFromNode = function (doc, node, xmllang, errorHandler) {
+    initFromNode(doc, node, xmllang, errorHandler) {
         StyledElement.prototype.initFromNode.call(this, doc, null, node, errorHandler);
         TimedElement.prototype.initFromNode.call(this, doc, null, node, errorHandler);
         AnimatedElement.prototype.initFromNode.call(this, doc, null, node, errorHandler);
@@ -1135,17 +1169,19 @@
         ContainerElement.prototype.initFromNode.call(this, doc, null, node, errorHandler);
 
         this.lang = xmllang;
-    };
+    }
+}
 
-    /*
-     * Represents a TTML div element
-     */
+/*
+ * Represents a TTML div element
+ */
 
-    function Div() {
+class Div {
+    constructor() {
         ContentElement.call(this, 'div');
     }
 
-    Div.prototype.initFromNode = function (doc, parent, node, xmllang, errorHandler) {
+    initFromNode(doc, parent, node, xmllang, errorHandler) {
         StyledElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
         TimedElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
         AnimatedElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
@@ -1153,17 +1189,19 @@
         ContainerElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
 
         this.lang = xmllang;
-    };
+    }
+}
 
-    /*
-     * Represents a TTML p element
-     */
+/*
+ * Represents a TTML p element
+ */
 
-    function P() {
+class P {
+    constructor() {
         ContentElement.call(this, 'p');
     }
 
-    P.prototype.initFromNode = function (doc, parent, node, xmllang, errorHandler) {
+    initFromNode(doc, parent, node, xmllang, errorHandler) {
         StyledElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
         TimedElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
         AnimatedElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
@@ -1171,17 +1209,19 @@
         ContainerElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
 
         this.lang = xmllang;
-    };
+    }
+}
 
-    /*
-     * Represents a TTML span element
-     */
+/*
+ * Represents a TTML span element
+ */
 
-    function Span() {
+class Span {
+    constructor() {
         ContentElement.call(this, 'span');
     }
 
-    Span.prototype.initFromNode = function (doc, parent, node, xmllang, xmlspace, errorHandler) {
+    initFromNode(doc, parent, node, xmllang, xmlspace, errorHandler) {
         StyledElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
         TimedElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
         AnimatedElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
@@ -1190,48 +1230,54 @@
 
         this.space = xmlspace;
         this.lang = xmllang;
-    };
+    }
+}
 
-    /*
-     * Represents a TTML anonymous span element
-     */
+/*
+ * Represents a TTML anonymous span element
+ */
 
-    function AnonymousSpan() {
+class AnonymousSpan {
+    constructor() {
         ContentElement.call(this, 'span');
     }
 
-    AnonymousSpan.prototype.initFromText = function (doc, parent, text, xmllang, xmlspace, errorHandler) {
+    initFromText(doc, parent, text, xmllang, xmlspace, errorHandler) {
         TimedElement.prototype.initFromNode.call(this, doc, parent, null, errorHandler);
 
         this.text = text;
         this.space = xmlspace;
         this.lang = xmllang;
-    };
+    }
+}
 
-    /*
-     * Represents a TTML br element
-     */
+/*
+ * Represents a TTML br element
+ */
 
-    function Br() {
+class Br {
+    constructor() {
         ContentElement.call(this, 'br');
     }
 
-    Br.prototype.initFromNode = function (doc, parent, node, xmllang, errorHandler) {
+    initFromNode(doc, parent, node, xmllang, errorHandler) {
         LayoutElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
         TimedElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
 
         this.lang = xmllang;
-    };
+    }
+}
 
-    /*
-     * Represents a TTML Region element
-     * 
-     */
+/*
+ * Represents a TTML Region element
+ * 
+ */
 
-    function Region() {
+class Region {
+    constructor() {
     }
 
-    Region.prototype.createDefaultRegion = function (xmllang) {
+    static createDefaultRegion(xmllang) {
         var r = new Region();
 
         IdentifiedElement.call(r, '');
@@ -1242,9 +1288,9 @@
         this.lang = xmllang;
 
         return r;
-    };
+    }
 
-    Region.prototype.initFromNode = function (doc, node, xmllang, errorHandler) {
+    initFromNode(doc, node, xmllang, errorHandler) {
         IdentifiedElement.prototype.initFromNode.call(this, doc, null, node, errorHandler);
         TimedElement.prototype.initFromNode.call(this, doc, null, node, errorHandler);
         AnimatedElement.prototype.initFromNode.call(this, doc, null, node, errorHandler);
@@ -1260,17 +1306,20 @@
         /* xml:lang */
 
         this.lang = xmllang;
-    };
+    }
+}
 
-    /*
-     * Represents a TTML Set element
-     * 
-     */
 
-    function Set() {
+/*
+ * Represents a TTML Set element
+ * 
+ */
+
+class Set {
+    constructor() {
     }
 
-    Set.prototype.initFromNode = function (doc, parent, node, errorHandler) {
+    initFromNode(doc, parent, node, errorHandler) {
 
         TimedElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
 
@@ -1281,7 +1330,7 @@
 
         for (var qname in styles) {
 
-            if (! styles.hasOwnProperty(qname)) continue;
+            if (!styles.hasOwnProperty(qname)) continue;
 
             if (this.qname) {
 
@@ -1295,81 +1344,80 @@
 
         }
 
-    };
-
-    /*
-     * Utility functions
-     * 
-     */
+    }
+}
 
+/*
+ * Utility functions
+ * 
+ */
 
-    function elementGetXMLID(node) {
-        return node && 'xml:id' in node.attributes ? node.attributes['xml:id'].value || null : null;
-    }
 
-    function elementGetRegionID(node) {
-        return node && 'region' in node.attributes ? node.attributes.region.value : '';
-    }
+function elementGetXMLID(node) {
+    return node && 'xml:id' in node.attributes ? node.attributes['xml:id'].value || null : null;
+}
 
-    function elementGetTimeContainer(node, errorHandler) {
+function elementGetRegionID(node) {
+    return node && 'region' in node.attributes ? node.attributes.region.value : '';
+}
 
-        var tc = node && 'timeContainer' in node.attributes ? node.attributes.timeContainer.value : null;
+function elementGetTimeContainer(node, errorHandler) {
 
-        if ((!tc) || tc === "par") {
+    var tc = node && 'timeContainer' in node.attributes ? node.attributes.timeContainer.value : null;
 
-            return "par";
+    if ((!tc) || tc === "par") {
 
-        } else if (tc === "seq") {
+        return "par";
 
-            return "seq";
+    } else if (tc === "seq") {
 
-        } else {
+        return "seq";
 
-            reportError(errorHandler, "Illegal value of timeContainer (assuming 'par')");
+    } else {
 
-            return "par";
+        reportError(errorHandler, "Illegal value of timeContainer (assuming 'par')");
 
-        }
+        return "par";
 
     }
 
-    function elementGetStyleRefs(node) {
+}
 
-        return node && 'style' in node.attributes ? node.attributes.style.value.split(" ") : [];
+function elementGetStyleRefs(node) {
 
-    }
+    return node && 'style' in node.attributes ? node.attributes.style.value.split(" ") : [];
 
-    function elementGetStyles(node, errorHandler) {
+}
 
-        var s = {};
+function elementGetStyles(node, errorHandler) {
 
-        if (node !== null) {
+    var s = {};
 
-            for (var i in node.attributes) {
+    if (node !== null) {
 
-                var qname = node.attributes[i].uri + " " + node.attributes[i].local;
+        for (var i in node.attributes) {
 
-                var sa = imscStyles.byQName[qname];
+            var qname = node.attributes[i].uri + " " + node.attributes[i].local;
 
-                if (sa !== undefined) {
+            var sa = byQName[qname];
 
-                    var val = sa.parse(node.attributes[i].value);
+            if (sa !== undefined) {
 
-                    if (val !== null) {
+                var val = sa.parse(node.attributes[i].value);
 
-                        s[qname] = val;
+                if (val !== null) {
 
-                        /* TODO: consider refactoring errorHandler into parse and compute routines */
+                    s[qname] = val;
 
-                        if (sa === imscStyles.byName.zIndex) {
-                            reportWarning(errorHandler, "zIndex attribute present but not used by IMSC1 since regions do not overlap");
-                        }
+                    /* TODO: consider refactoring errorHandler into parse and compute routines */
 
-                    } else {
+                    if (sa === byName.zIndex) {
+                        reportWarning(errorHandler, "zIndex attribute present but not used by IMSC1 since regions do not overlap");
+                    }
 
-                        reportError(errorHandler, "Cannot parse styling attribute " + qname + " --> " + node.attributes[i].value);
+                } else {
 
-                    }
+                    reportError(errorHandler, "Cannot parse styling attribute " + qname + " --> " + node.attributes[i].value);
 
                 }
 
@@ -1377,483 +1425,445 @@
 
         }
 
-        return s;
     }
 
-    function findAttribute(node, ns, name) {
-        for (var i in node.attributes) {
+    return s;
+}
 
-            if (node.attributes[i].uri === ns &&
-                    node.attributes[i].local === name) {
+function findAttribute(node, ns, name) {
+    for (var i in node.attributes) {
 
-                return node.attributes[i].value;
-            }
-        }
+        if (node.attributes[i].uri === ns &&
+            node.attributes[i].local === name) {
 
-        return null;
+            return node.attributes[i].value;
+        }
     }
 
-    function extractAspectRatio(node, errorHandler) {
+    return null;
+}
 
-        var ar = findAttribute(node, imscNames.ns_ittp, "aspectRatio");
+function extractAspectRatio(node, errorHandler) {
 
-        if (ar === null) {
-            
-            ar = findAttribute(node, imscNames.ns_ttp, "displayAspectRatio");
-            
-        }
+    var ar = findAttribute(node, ns_ittp, "aspectRatio");
+
+    if (ar === null) {
 
-        var rslt = null;
+        ar = findAttribute(node, ns_ttp, "displayAspectRatio");
 
-        if (ar !== null) {
+    }
 
-            var ASPECT_RATIO_RE = /(\d+)\s+(\d+)/;
+    var rslt = null;
 
-            var m = ASPECT_RATIO_RE.exec(ar);
+    if (ar !== null) {
 
-            if (m !== null) {
+        var ASPECT_RATIO_RE = /(\d+)\s+(\d+)/;
 
-                var w = parseInt(m[1]);
+        var m = ASPECT_RATIO_RE.exec(ar);
 
-                var h = parseInt(m[2]);
+        if (m !== null) {
 
-                if (w !== 0 && h !== 0) {
+            var w = parseInt(m[1]);
 
-                    rslt = w / h;
+            var h = parseInt(m[2]);
 
-                } else {
+            if (w !== 0 && h !== 0) {
 
-                    reportError(errorHandler, "Illegal aspectRatio values (ignoring)");
-                }
+                rslt = w / h;
 
             } else {
 
-                reportError(errorHandler, "Malformed aspectRatio attribute (ignoring)");
+                reportError(errorHandler, "Illegal aspectRatio values (ignoring)");
             }
 
-        }
+        } else {
 
-        return rslt;
+            reportError(errorHandler, "Malformed aspectRatio attribute (ignoring)");
+        }
 
     }
 
-    /*
-     * Returns the cellResolution attribute from a node
-     * 
-     */
-    function extractCellResolution(node, errorHandler) {
+    return rslt;
 
-        var cr = findAttribute(node, imscNames.ns_ttp, "cellResolution");
+}
 
-        // initial value
+/*
+ * Returns the cellResolution attribute from a node
+ * 
+ */
+function extractCellResolution(node, errorHandler) {
 
-        var h = 15;
-        var w = 32;
+    var cr = findAttribute(node, ns_ttp, "cellResolution");
 
-        if (cr !== null) {
+    // initial value
 
-            var CELL_RESOLUTION_RE = /(\d+) (\d+)/;
+    var h = 15;
+    var w = 32;
 
-            var m = CELL_RESOLUTION_RE.exec(cr);
+    if (cr !== null) {
 
-            if (m !== null) {
+        var CELL_RESOLUTION_RE = /(\d+) (\d+)/;
 
-                w = parseInt(m[1]);
+        var m = CELL_RESOLUTION_RE.exec(cr);
 
-                h = parseInt(m[2]);
+        if (m !== null) {
 
-            } else {
+            w = parseInt(m[1]);
 
-                reportWarning(errorHandler, "Malformed cellResolution value (using initial value instead)");
+            h = parseInt(m[2]);
 
-            }
+        } else {
 
-        }
+            reportWarning(errorHandler, "Malformed cellResolution value (using initial value instead)");
 
-        return {'w': w, 'h': h};
+        }
 
     }
 
+    return { 'w': w, 'h': h };
 
-    function extractFrameAndTickRate(node, errorHandler) {
+}
 
-        // subFrameRate is ignored per IMSC1 specification
 
-        // extract frame rate
+function extractFrameAndTickRate(node, errorHandler) {
 
-        var fps_attr = findAttribute(node, imscNames.ns_ttp, "frameRate");
+    // subFrameRate is ignored per IMSC1 specification
 
-        // initial value
+    // extract frame rate
 
-        var fps = 30;
+    var fps_attr = findAttribute(node, ns_ttp, "frameRate");
 
-        // match variable
+    // initial value
 
-        var m;
+    var fps = 30;
 
-        if (fps_attr !== null) {
+    // match variable
 
-            var FRAME_RATE_RE = /(\d+)/;
+    var m;
 
-            m = FRAME_RATE_RE.exec(fps_attr);
+    if (fps_attr !== null) {
 
-            if (m !== null) {
+        var FRAME_RATE_RE = /(\d+)/;
 
-                fps = parseInt(m[1]);
+        m = FRAME_RATE_RE.exec(fps_attr);
 
-            } else {
+        if (m !== null) {
 
-                reportWarning(errorHandler, "Malformed frame rate attribute (using initial value instead)");
-            }
+            fps = parseInt(m[1]);
 
+        } else {
+
+            reportWarning(errorHandler, "Malformed frame rate attribute (using initial value instead)");
         }
 
-        // extract frame rate multiplier
+    }
 
-        var frm_attr = findAttribute(node, imscNames.ns_ttp, "frameRateMultiplier");
+    // extract frame rate multiplier
 
-        // initial value
+    var frm_attr = findAttribute(node, ns_ttp, "frameRateMultiplier");
 
-        var frm = 1;
+    // initial value
 
-        if (frm_attr !== null) {
+    var frm = 1;
 
-            var FRAME_RATE_MULT_RE = /(\d+) (\d+)/;
+    if (frm_attr !== null) {
 
-            m = FRAME_RATE_MULT_RE.exec(frm_attr);
+        var FRAME_RATE_MULT_RE = /(\d+) (\d+)/;
 
-            if (m !== null) {
+        m = FRAME_RATE_MULT_RE.exec(frm_attr);
 
-                frm = parseInt(m[1]) / parseInt(m[2]);
+        if (m !== null) {
 
-            } else {
+            frm = parseInt(m[1]) / parseInt(m[2]);
 
-                reportWarning(errorHandler, "Malformed frame rate multiplier attribute (using initial value instead)");
-            }
+        } else {
 
+            reportWarning(errorHandler, "Malformed frame rate multiplier attribute (using initial value instead)");
         }
 
-        var efps = frm * fps;
+    }
 
-        // extract tick rate
+    var efps = frm * fps;
 
-        var tr = 1;
+    // extract tick rate
 
-        var trattr = findAttribute(node, imscNames.ns_ttp, "tickRate");
+    var tr = 1;
 
-        if (trattr === null) {
+    var trattr = findAttribute(node, ns_ttp, "tickRate");
 
-            if (fps_attr !== null)
-                tr = efps;
+    if (trattr === null) {
 
-        } else {
+        if (fps_attr !== null)
+            tr = efps;
 
-            var TICK_RATE_RE = /(\d+)/;
+    } else {
 
-            m = TICK_RATE_RE.exec(trattr);
+        var TICK_RATE_RE = /(\d+)/;
 
-            if (m !== null) {
+        m = TICK_RATE_RE.exec(trattr);
 
-                tr = parseInt(m[1]);
+        if (m !== null) {
 
-            } else {
+            tr = parseInt(m[1]);
 
-                reportWarning(errorHandler, "Malformed tick rate attribute (using initial value instead)");
-            }
+        } else {
 
+            reportWarning(errorHandler, "Malformed tick rate attribute (using initial value instead)");
         }
 
-        return {effectiveFrameRate: efps, tickRate: tr};
-
     }
 
-    function extractExtent(node, errorHandler) {
+    return { effectiveFrameRate: efps, tickRate: tr };
 
-        var attr = findAttribute(node, imscNames.ns_tts, "extent");
+}
 
-        if (attr === null)
-            return null;
+function extractExtent(node, errorHandler) {
 
-        var s = attr.split(" ");
+    var attr = findAttribute(node, ns_tts, "extent");
 
-        if (s.length !== 2) {
+    if (attr === null)
+        return null;
 
-            reportWarning(errorHandler, "Malformed extent (ignoring)");
+    var s = attr.split(" ");
 
-            return null;
-        }
+    if (s.length !== 2) {
 
-        var w = imscUtils.parseLength(s[0]);
+        reportWarning(errorHandler, "Malformed extent (ignoring)");
 
-        var h = imscUtils.parseLength(s[1]);
+        return null;
+    }
 
-        if (!h || !w) {
+    var w = parseLength(s[0]);
 
-            reportWarning(errorHandler, "Malformed extent values (ignoring)");
+    var h = parseLength(s[1]);
 
-            return null;
-        }
+    if (!h || !w) {
 
-        return {'h': h, 'w': w};
+        reportWarning(errorHandler, "Malformed extent values (ignoring)");
 
+        return null;
     }
 
-    function parseTimeExpression(tickRate, effectiveFrameRate, str) {
+    return { 'h': h, 'w': w };
 
-        var CLOCK_TIME_FRACTION_RE = /^(\d{2,}):(\d\d):(\d\d(?:\.\d+)?)$/;
-        var CLOCK_TIME_FRAMES_RE = /^(\d{2,}):(\d\d):(\d\d)\:(\d{2,})$/;
-        var OFFSET_FRAME_RE = /^(\d+(?:\.\d+)?)f$/;
-        var OFFSET_TICK_RE = /^(\d+(?:\.\d+)?)t$/;
-        var OFFSET_MS_RE = /^(\d+(?:\.\d+)?)ms$/;
-        var OFFSET_S_RE = /^(\d+(?:\.\d+)?)s$/;
-        var OFFSET_H_RE = /^(\d+(?:\.\d+)?)h$/;
-        var OFFSET_M_RE = /^(\d+(?:\.\d+)?)m$/;
-        var m;
-        var r = null;
-        if ((m = OFFSET_FRAME_RE.exec(str)) !== null) {
+}
 
-            if (effectiveFrameRate !== null) {
+function parseTimeExpression(tickRate, effectiveFrameRate, str) {
 
-                r = parseFloat(m[1]) / effectiveFrameRate;
-            }
+    var CLOCK_TIME_FRACTION_RE = /^(\d{2,}):(\d\d):(\d\d(?:\.\d+)?)$/;
+    var CLOCK_TIME_FRAMES_RE = /^(\d{2,}):(\d\d):(\d\d)\:(\d{2,})$/;
+    var OFFSET_FRAME_RE = /^(\d+(?:\.\d+)?)f$/;
+    var OFFSET_TICK_RE = /^(\d+(?:\.\d+)?)t$/;
+    var OFFSET_MS_RE = /^(\d+(?:\.\d+)?)ms$/;
+    var OFFSET_S_RE = /^(\d+(?:\.\d+)?)s$/;
+    var OFFSET_H_RE = /^(\d+(?:\.\d+)?)h$/;
+    var OFFSET_M_RE = /^(\d+(?:\.\d+)?)m$/;
+    var m;
+    var r = null;
+    if ((m = OFFSET_FRAME_RE.exec(str)) !== null) {
 
-        } else if ((m = OFFSET_TICK_RE.exec(str)) !== null) {
+        if (effectiveFrameRate !== null) {
 
-            if (tickRate !== null) {
+            r = parseFloat(m[1]) / effectiveFrameRate;
+        }
 
-                r = parseFloat(m[1]) / tickRate;
-            }
+    } else if ((m = OFFSET_TICK_RE.exec(str)) !== null) {
 
-        } else if ((m = OFFSET_MS_RE.exec(str)) !== null) {
+        if (tickRate !== null) {
 
-            r = parseFloat(m[1]) / 1000.0;
+            r = parseFloat(m[1]) / tickRate;
+        }
 
-        } else if ((m = OFFSET_S_RE.exec(str)) !== null) {
+    } else if ((m = OFFSET_MS_RE.exec(str)) !== null) {
 
-            r = parseFloat(m[1]);
+        r = parseFloat(m[1]) / 1000.0;
 
-        } else if ((m = OFFSET_H_RE.exec(str)) !== null) {
+    } else if ((m = OFFSET_S_RE.exec(str)) !== null) {
 
-            r = parseFloat(m[1]) * 3600.0;
+        r = parseFloat(m[1]);
 
-        } else if ((m = OFFSET_M_RE.exec(str)) !== null) {
+    } else if ((m = OFFSET_H_RE.exec(str)) !== null) {
 
-            r = parseFloat(m[1]) * 60.0;
+        r = parseFloat(m[1]) * 3600.0;
 
-        } else if ((m = CLOCK_TIME_FRACTION_RE.exec(str)) !== null) {
+    } else if ((m = OFFSET_M_RE.exec(str)) !== null) {
 
-            r = parseInt(m[1]) * 3600 +
-                    parseInt(m[2]) * 60 +
-                    parseFloat(m[3]);
+        r = parseFloat(m[1]) * 60.0;
 
-        } else if ((m = CLOCK_TIME_FRAMES_RE.exec(str)) !== null) {
+    } else if ((m = CLOCK_TIME_FRACTION_RE.exec(str)) !== null) {
 
-            /* this assumes that HH:MM:SS is a clock-time-with-fraction */
+        r = parseInt(m[1]) * 3600 +
+            parseInt(m[2]) * 60 +
+            parseFloat(m[3]);
 
-            if (effectiveFrameRate !== null) {
+    } else if ((m = CLOCK_TIME_FRAMES_RE.exec(str)) !== null) {
 
-                r = parseInt(m[1]) * 3600 +
-                        parseInt(m[2]) * 60 +
-                        parseInt(m[3]) +
-                        (m[4] === null ? 0 : parseInt(m[4]) / effectiveFrameRate);
-            }
+        /* this assumes that HH:MM:SS is a clock-time-with-fraction */
+
+        if (effectiveFrameRate !== null) {
 
+            r = parseInt(m[1]) * 3600 +
+                parseInt(m[2]) * 60 +
+                parseInt(m[3]) +
+                (m[4] === null ? 0 : parseInt(m[4]) / effectiveFrameRate);
         }
 
-        return r;
     }
 
-    function processTiming(doc, parent, node, errorHandler) {
+    return r;
+}
 
-        /* determine explicit begin */
+function processTiming(doc, parent, node, errorHandler) {
 
-        var explicit_begin = null;
+    /* determine explicit begin */
 
-        if (node && 'begin' in node.attributes) {
+    var explicit_begin = null;
 
-            explicit_begin = parseTimeExpression(doc.tickRate, doc.effectiveFrameRate, node.attributes.begin.value);
+    if (node && 'begin' in node.attributes) {
 
-            if (explicit_begin === null) {
+        explicit_begin = parseTimeExpression(doc.tickRate, doc.effectiveFrameRate, node.attributes.begin.value);
 
-                reportWarning(errorHandler, "Malformed begin value " + node.attributes.begin.value + " (using 0)");
+        if (explicit_begin === null) {
 
-            }
+            reportWarning(errorHandler, "Malformed begin value " + node.attributes.begin.value + " (using 0)");
 
         }
 
-        /* determine explicit duration */
+    }
 
-        var explicit_dur = null;
+    /* determine explicit duration */
 
-        if (node && 'dur' in node.attributes) {
+    var explicit_dur = null;
 
-            explicit_dur = parseTimeExpression(doc.tickRate, doc.effectiveFrameRate, node.attributes.dur.value);
+    if (node && 'dur' in node.attributes) {
 
-            if (explicit_dur === null) {
+        explicit_dur = parseTimeExpression(doc.tickRate, doc.effectiveFrameRate, node.attributes.dur.value);
 
-                reportWarning(errorHandler, "Malformed dur value " + node.attributes.dur.value + " (ignoring)");
+        if (explicit_dur === null) {
 
-            }
+            reportWarning(errorHandler, "Malformed dur value " + node.attributes.dur.value + " (ignoring)");
 
         }
 
-        /* determine explicit end */
+    }
 
-        var explicit_end = null;
+    /* determine explicit end */
 
-        if (node && 'end' in node.attributes) {
+    var explicit_end = null;
 
-            explicit_end = parseTimeExpression(doc.tickRate, doc.effectiveFrameRate, node.attributes.end.value);
+    if (node && 'end' in node.attributes) {
 
-            if (explicit_end === null) {
+        explicit_end = parseTimeExpression(doc.tickRate, doc.effectiveFrameRate, node.attributes.end.value);
 
-                reportWarning(errorHandler, "Malformed end value (ignoring)");
+        if (explicit_end === null) {
 
-            }
+            reportWarning(errorHandler, "Malformed end value (ignoring)");
 
         }
 
-        return {explicit_begin: explicit_begin,
-            explicit_end: explicit_end,
-            explicit_dur: explicit_dur};
-
     }
 
+    return {
+        explicit_begin: explicit_begin,
+        explicit_end: explicit_end,
+        explicit_dur: explicit_dur
+    };
 
+}
 
-    function mergeChainedStyles(styling, style, errorHandler) {
 
-        while (style.styleRefs.length > 0) {
 
-            var sref = style.styleRefs.pop();
+function mergeChainedStyles(styling, style, errorHandler) {
 
-            if (!(sref in styling.styles)) {
-                reportError(errorHandler, "Non-existant style id referenced");
-                continue;
-            }
+    while (style.styleRefs.length > 0) {
 
-            mergeChainedStyles(styling, styling.styles[sref], errorHandler);
-
-            mergeStylesIfNotPresent(styling.styles[sref].styleAttrs, style.styleAttrs);
+        var sref = style.styleRefs.pop();
 
+        if (!(sref in styling.styles)) {
+            reportError(errorHandler, "Non-existant style id referenced");
+            continue;
         }
 
-    }
-
-    function mergeReferencedStyles(styling, stylerefs, styleattrs, errorHandler) {
+        mergeChainedStyles(styling, styling.styles[sref], errorHandler);
 
-        for (var i = stylerefs.length - 1; i >= 0; i--) {
-
-            var sref = stylerefs[i];
-
-            if (!(sref in styling.styles)) {
-                reportError(errorHandler, "Non-existant style id referenced");
-                continue;
-            }
-
-            mergeStylesIfNotPresent(styling.styles[sref].styleAttrs, styleattrs);
-
-        }
+        mergeStylesIfNotPresent(styling.styles[sref].styleAttrs, style.styleAttrs);
 
     }
 
-    function mergeStylesIfNotPresent(from_styles, into_styles) {
+}
 
-        for (var sname in from_styles) {
+function mergeReferencedStyles(styling, stylerefs, styleattrs, errorHandler) {
 
-            if (! from_styles.hasOwnProperty(sname)) continue;
+    for (var i = stylerefs.length - 1; i >= 0; i--) {
 
-            if (sname in into_styles)
-                continue;
-
-            into_styles[sname] = from_styles[sname];
+        var sref = stylerefs[i];
 
+        if (!(sref in styling.styles)) {
+            reportError(errorHandler, "Non-existant style id referenced");
+            continue;
         }
 
-    }
-
-    /* TODO: validate style format at parsing */
-
-
-    /*
-     * ERROR HANDLING UTILITY FUNCTIONS
-     * 
-     */
-
-    function reportInfo(errorHandler, msg) {
-
-        if (errorHandler && errorHandler.info && errorHandler.info(msg))
-            throw msg;
+        mergeStylesIfNotPresent(styling.styles[sref].styleAttrs, styleattrs);
 
     }
 
-    function reportWarning(errorHandler, msg) {
+}
 
-        if (errorHandler && errorHandler.warn && errorHandler.warn(msg))
-            throw msg;
+function mergeStylesIfNotPresent(from_styles, into_styles) {
 
-    }
+    for (var sname in from_styles) {
 
-    function reportError(errorHandler, msg) {
+        if (!from_styles.hasOwnProperty(sname)) continue;
 
-        if (errorHandler && errorHandler.error && errorHandler.error(msg))
-            throw msg;
-
-    }
+        if (sname in into_styles)
+            continue;
 
-    function reportFatal(errorHandler, msg) {
+        into_styles[sname] = from_styles[sname];
 
-        if (errorHandler && errorHandler.fatal)
-            errorHandler.fatal(msg);
+    }
 
-        throw msg;
+}
 
-    }
+/* TODO: validate style format at parsing */
 
-    /*
-     * Binary search utility function
-     * 
-     * @typedef {Object} BinarySearchResult
-     * @property {boolean} found Was an exact match found?
-     * @property {number} index Position of the exact match or insert position
-     * 
-     * @returns {BinarySearchResult}
-     */
 
-    function indexOf(arr, searchval) {
+/*
+ * Binary search utility function
+ * 
+ * @typedef {Object} BinarySearchResult
+ * @property {boolean} found Was an exact match found?
+ * @property {number} index Position of the exact match or insert position
+ * 
+ * @returns {BinarySearchResult}
+ */
 
-        var min = 0;
-        var max = arr.length - 1;
-        var cur;
+function indexOf(arr, searchval) {
 
-        while (min <= max) {
+    var min = 0;
+    var max = arr.length - 1;
+    var cur;
 
-            cur = Math.floor((min + max) / 2);
+    while (min <= max) {
 
-            var curval = arr[cur];
+        cur = Math.floor((min + max) / 2);
 
-            if (curval < searchval) {
+        var curval = arr[cur];
 
-                min = cur + 1;
+        if (curval < searchval) {
 
-            } else if (curval > searchval) {
+            min = cur + 1;
 
-                max = cur - 1;
+        } else if (curval > searchval) {
 
-            } else {
+            max = cur - 1;
 
-                return {found: true, index: cur};
+        } else {
 
-            }
+            return { found: true, index: cur };
 
         }
 
-        return {found: false, index: min};
     }
 
-
-})(typeof exports === 'undefined' ? this.imscDoc = {} : exports,
-        typeof sax === 'undefined' ? require("sax") : sax,
-        typeof imscNames === 'undefined' ? require("./names") : imscNames,
-        typeof imscStyles === 'undefined' ? require("./styles") : imscStyles,
-        typeof imscUtils === 'undefined' ? require("./utils") : imscUtils);
+    return { found: false, index: min };
+}
diff --git a/src/main/js/error.js b/src/main/js/error.js
new file mode 100644
index 00000000..193809dd
--- /dev/null
+++ b/src/main/js/error.js
@@ -0,0 +1,27 @@
+/*
+ * ERROR HANDLING UTILITY FUNCTIONS
+ * 
+ */
+
+export function reportWarning(errorHandler, msg) {
+
+  if (errorHandler && errorHandler.warn && errorHandler.warn(msg))
+    throw msg;
+
+}
+
+export function reportError(errorHandler, msg) {
+
+  if (errorHandler && errorHandler.error && errorHandler.error(msg))
+    throw msg;
+
+}
+
+export function reportFatal(errorHandler, msg) {
+
+  if (errorHandler && errorHandler.fatal)
+    errorHandler.fatal(msg);
+
+  throw msg;
+
+}
diff --git a/src/main/js/html.js b/src/main/js/html.js
index 0a539fd3..26d21028 100755
--- a/src/main/js/html.js
+++ b/src/main/js/html.js
@@ -24,755 +24,754 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
+import { reportError } from './error.js';
+import { byName } from './styles.js';
+
 /**
  * @module imscHTML
  */
 
 var browserIsFirefox = /firefox/i.test(navigator.userAgent);
 
-;
-(function (imscHTML, imscNames, imscStyles) {
-
-    /**
-     * Function that maps <pre>smpte:background</pre> URIs to URLs resolving to image resource
-     * @callback IMGResolver
-     * @param {string} <pre>smpte:background</pre> URI
-     * @return {string} PNG resource URL
-     */
-
-
-    /**
-     * Renders an ISD object (returned by <pre>generateISD()</pre>) into a 
-     * parent element, that must be attached to the DOM. The ISD will be rendered
-     * into a child <pre>div</pre>
-     * with heigh and width equal to the clientHeight and clientWidth of the element,
-     * unless explicitly specified otherwise by the caller. Images URIs specified 
-     * by <pre>smpte:background</pre> attributes are mapped to image resource URLs
-     * by an <pre>imgResolver</pre> function. The latter takes the value of <code>smpte:background</code>
-     * attribute and an <code>img</code> DOM element as input, and is expected to
-     * set the <code>src</code> attribute of the <code>img</code> to the absolute URI of the image.
-     * <pre>displayForcedOnlyMode</pre> sets the (boolean)
-     * value of the IMSC1 displayForcedOnlyMode parameter. The function returns
-     * an opaque object that should passed in <code>previousISDState</code> when this function
-     * is called for the next ISD, otherwise <code>previousISDState</code> should be set to 
-     * <code>null</code>.
-     * 
-     * @param {Object} isd ISD to be rendered
-     * @param {Object} element Element into which the ISD is rendered
-     * @param {?IMGResolver} imgResolver Resolve <pre>smpte:background</pre> URIs into URLs.
-     * @param {?number} eheight Height (in pixel) of the child <div>div</div> or null 
-     *                  to use clientHeight of the parent element
-     * @param {?number} ewidth Width (in pixel) of the child <div>div</div> or null
-     *                  to use clientWidth of the parent element
-     * @param {?boolean} displayForcedOnlyMode Value of the IMSC1 displayForcedOnlyMode parameter,
-     *                   or false if null         
-     * @param {?module:imscUtils.ErrorHandler} errorHandler Error callback
-     * @param {Object} previousISDState State saved during processing of the previous ISD, or null if initial call
-     * @param {?boolean} enableRollUp Enables roll-up animations (see CEA 708)
-     * @return {Object} ISD state to be provided when this funtion is called for the next ISD
-     */
-
-    imscHTML.render = function (isd,
-            element,
-            imgResolver,
-            eheight,
-            ewidth,
-            displayForcedOnlyMode,
-            errorHandler,
-            previousISDState,
-            enableRollUp
-            ) {
 
-        /* maintain aspect ratio if specified */
+/**
+ * Function that maps <pre>smpte:background</pre> URIs to URLs resolving to image resource
+ * @callback IMGResolver
+ * @param {string} <pre>smpte:background</pre> URI
+ * @return {string} PNG resource URL
+ */
 
-        var height = eheight || element.clientHeight;
-        var width = ewidth || element.clientWidth;
 
-        if (isd.aspectRatio !== null) {
+/**
+ * Renders an ISD object (returned by <pre>generateISD()</pre>) into a 
+ * parent element, that must be attached to the DOM. The ISD will be rendered
+ * into a child <pre>div</pre>
+ * with heigh and width equal to the clientHeight and clientWidth of the element,
+ * unless explicitly specified otherwise by the caller. Images URIs specified 
+ * by <pre>smpte:background</pre> attributes are mapped to image resource URLs
+ * by an <pre>imgResolver</pre> function. The latter takes the value of <code>smpte:background</code>
+ * attribute and an <code>img</code> DOM element as input, and is expected to
+ * set the <code>src</code> attribute of the <code>img</code> to the absolute URI of the image.
+ * <pre>displayForcedOnlyMode</pre> sets the (boolean)
+ * value of the IMSC1 displayForcedOnlyMode parameter. The function returns
+ * an opaque object that should passed in <code>previousISDState</code> when this function
+ * is called for the next ISD, otherwise <code>previousISDState</code> should be set to 
+ * <code>null</code>.
+ * 
+ * @param {Object} isd ISD to be rendered
+ * @param {Object} element Element into which the ISD is rendered
+ * @param {?IMGResolver} imgResolver Resolve <pre>smpte:background</pre> URIs into URLs.
+ * @param {?number} eheight Height (in pixel) of the child <div>div</div> or null 
+ *                  to use clientHeight of the parent element
+ * @param {?number} ewidth Width (in pixel) of the child <div>div</div> or null
+ *                  to use clientWidth of the parent element
+ * @param {?boolean} displayForcedOnlyMode Value of the IMSC1 displayForcedOnlyMode parameter,
+ *                   or false if null         
+ * @param {?module:imscUtils.ErrorHandler} errorHandler Error callback
+ * @param {Object} previousISDState State saved during processing of the previous ISD, or null if initial call
+ * @param {?boolean} enableRollUp Enables roll-up animations (see CEA 708)
+ * @return {Object} ISD state to be provided when this funtion is called for the next ISD
+ */
 
-            var twidth = height * isd.aspectRatio;
+export function renderHTML(isd,
+    element,
+    imgResolver,
+    eheight,
+    ewidth,
+    displayForcedOnlyMode,
+    errorHandler,
+    previousISDState,
+    enableRollUp
+) {
 
-            if (twidth > width) {
+    /* maintain aspect ratio if specified */
 
-                height = Math.round(width / isd.aspectRatio);
+    var height = eheight || element.clientHeight;
+    var width = ewidth || element.clientWidth;
 
-            } else {
+    if (isd.aspectRatio !== null) {
 
-                width = twidth;
+        var twidth = height * isd.aspectRatio;
 
-            }
+        if (twidth > width) {
 
-        }
+            height = Math.round(width / isd.aspectRatio);
 
-        var rootcontainer = document.createElement("div");
-
-        rootcontainer.style.position = "relative";
-        rootcontainer.style.width = width + "px";
-        rootcontainer.style.height = height + "px";
-        rootcontainer.style.margin = "auto";
-        rootcontainer.style.top = 0;
-        rootcontainer.style.bottom = 0;
-        rootcontainer.style.left = 0;
-        rootcontainer.style.right = 0;
-        rootcontainer.style.zIndex = 0;
-
-        var context = {
-            h: height,
-            w: width,
-            regionH: null,
-            regionW: null,
-            imgResolver: imgResolver,
-            displayForcedOnlyMode: displayForcedOnlyMode || false,
-            isd: isd,
-            errorHandler: errorHandler,
-            previousISDState: previousISDState,
-            enableRollUp: enableRollUp || false,
-            currentISDState: {},
-            flg: null, /* current fillLineGap value if active, null otherwise */
-            lp: null, /* current linePadding value if active, null otherwise */
-            mra: null, /* current multiRowAlign value if active, null otherwise */
-            ipd: null, /* inline progression direction (lr, rl, tb) */
-            bpd: null, /* block progression direction (lr, rl, tb) */
-            ruby: null, /* is ruby present in a <p> */
-            textEmphasis: null, /* is textEmphasis present in a <p> */
-            rubyReserve: null /* is rubyReserve applicable to a <p> */
-        };
-
-        element.appendChild(rootcontainer);
-
-        if ("contents" in isd) {
-
-            for (var i = 0; i < isd.contents.length; i++) {
-
-                processElement(context, rootcontainer, isd.contents[i], isd);
+        } else {
 
-            }
+            width = twidth;
 
         }
 
-        return context.currentISDState;
+    }
 
+    var rootcontainer = document.createElement("div");
+
+    rootcontainer.style.position = "relative";
+    rootcontainer.style.width = width + "px";
+    rootcontainer.style.height = height + "px";
+    rootcontainer.style.margin = "auto";
+    rootcontainer.style.top = 0;
+    rootcontainer.style.bottom = 0;
+    rootcontainer.style.left = 0;
+    rootcontainer.style.right = 0;
+    rootcontainer.style.zIndex = 0;
+
+    var context = {
+        h: height,
+        w: width,
+        regionH: null,
+        regionW: null,
+        imgResolver: imgResolver,
+        displayForcedOnlyMode: displayForcedOnlyMode || false,
+        isd: isd,
+        errorHandler: errorHandler,
+        previousISDState: previousISDState,
+        enableRollUp: enableRollUp || false,
+        currentISDState: {},
+        flg: null, /* current fillLineGap value if active, null otherwise */
+        lp: null, /* current linePadding value if active, null otherwise */
+        mra: null, /* current multiRowAlign value if active, null otherwise */
+        ipd: null, /* inline progression direction (lr, rl, tb) */
+        bpd: null, /* block progression direction (lr, rl, tb) */
+        ruby: null, /* is ruby present in a <p> */
+        textEmphasis: null, /* is textEmphasis present in a <p> */
+        rubyReserve: null /* is rubyReserve applicable to a <p> */
     };
 
-    function processElement(context, dom_parent, isd_element, isd_parent) {
+    element.appendChild(rootcontainer);
 
-        var e;
+    if ("contents" in isd) {
 
-        if (isd_element.kind === 'region') {
+        for (var i = 0; i < isd.contents.length; i++) {
 
-            e = document.createElement("div");
-            e.style.position = "absolute";
+            processElement(context, rootcontainer, isd.contents[i], isd);
 
-        } else if (isd_element.kind === 'body') {
+        }
 
-            e = document.createElement("div");
+    }
 
-        } else if (isd_element.kind === 'div') {
+    return context.currentISDState;
 
-            e = document.createElement("div");
+};
 
-        } else if (isd_element.kind === 'image') {
+function processElement(context, dom_parent, isd_element, isd_parent) {
 
-            e = document.createElement("img");
+    var e;
 
-            if (context.imgResolver !== null && isd_element.src !== null) {
+    if (isd_element.kind === 'region') {
 
-                var uri = context.imgResolver(isd_element.src, e);
+        e = document.createElement("div");
+        e.style.position = "absolute";
 
-                if (uri)
-                    e.src = uri;
+    } else if (isd_element.kind === 'body') {
 
-                e.height = context.regionH;
-                e.width = context.regionW;
+        e = document.createElement("div");
 
-            }
+    } else if (isd_element.kind === 'div') {
 
-        } else if (isd_element.kind === 'p') {
+        e = document.createElement("div");
 
-            e = document.createElement("p");
+    } else if (isd_element.kind === 'image') {
 
-        } else if (isd_element.kind === 'span') {
+        e = document.createElement("img");
 
-            if (isd_element.styleAttrs[imscStyles.byName.ruby.qname] === "container") {
+        if (context.imgResolver !== null && isd_element.src !== null) {
 
-                e = document.createElement("ruby");
+            var uri = context.imgResolver(isd_element.src, e);
 
-                context.ruby = true;
+            if (uri)
+                e.src = uri;
 
-            } else if (isd_element.styleAttrs[imscStyles.byName.ruby.qname] === "base") {
+            e.height = context.regionH;
+            e.width = context.regionW;
 
-                e = document.createElement("span"); // rb element is deprecated in HTML
+        }
 
-            } else if (isd_element.styleAttrs[imscStyles.byName.ruby.qname] === "text") {
+    } else if (isd_element.kind === 'p') {
 
-                e = document.createElement("rt");
+        e = document.createElement("p");
 
+    } else if (isd_element.kind === 'span') {
 
-            } else if (isd_element.styleAttrs[imscStyles.byName.ruby.qname] === "baseContainer") {
+        if (isd_element.styleAttrs[byName.ruby.qname] === "container") {
 
-                e = document.createElement("rbc");
+            e = document.createElement("ruby");
 
+            context.ruby = true;
 
-            } else if (isd_element.styleAttrs[imscStyles.byName.ruby.qname] === "textContainer") {
+        } else if (isd_element.styleAttrs[byName.ruby.qname] === "base") {
 
-                e = document.createElement("rtc");
+            e = document.createElement("span"); // rb element is deprecated in HTML
 
+        } else if (isd_element.styleAttrs[byName.ruby.qname] === "text") {
 
-            } else if (isd_element.styleAttrs[imscStyles.byName.ruby.qname] === "delimiter") {
+            e = document.createElement("rt");
 
-                /* ignore rp */
 
-                return;
+        } else if (isd_element.styleAttrs[byName.ruby.qname] === "baseContainer") {
 
-            } else {
+            e = document.createElement("rbc");
 
-                e = document.createElement("span");
 
-            }
+        } else if (isd_element.styleAttrs[byName.ruby.qname] === "textContainer") {
 
-            //e.textContent = isd_element.text;
+            e = document.createElement("rtc");
 
-        } else if (isd_element.kind === 'br') {
 
-            e = document.createElement("br");
+        } else if (isd_element.styleAttrs[byName.ruby.qname] === "delimiter") {
 
-        }
+            /* ignore rp */
 
-        if (!e) {
+            return;
 
-            reportError(context.errorHandler, "Error processing ISD element kind: " + isd_element.kind);
+        } else {
 
-            return;
+            e = document.createElement("span");
 
         }
 
-        /* set language */
+        //e.textContent = isd_element.text;
 
-        if (isd_element.lang) {
+    } else if (isd_element.kind === 'br') {
 
-            if (isd_element.kind === 'region' || isd_element.lang !== isd_parent.lang) {
-                e.lang = isd_element.lang;
-            }
+        e = document.createElement("br");
 
-        }
+    }
 
-        /* add to parent */
+    if (!e) {
 
-        dom_parent.appendChild(e);
+        reportError(context.errorHandler, "Error processing ISD element kind: " + isd_element.kind);
 
-        /* override UA default margin */
-        /* TODO: should apply to <p> only */
+        return;
 
-        e.style.margin = "0";
+    }
 
-        /* determine ipd and bpd */
+    /* set language */
 
-        if (isd_element.kind === "region") {
+    if (isd_element.lang) {
 
-            var wdir = isd_element.styleAttrs[imscStyles.byName.writingMode.qname];
+        if (isd_element.kind === 'region' || isd_element.lang !== isd_parent.lang) {
+            e.lang = isd_element.lang;
+        }
 
-            if (wdir === "lrtb" || wdir === "lr") {
+    }
 
-                context.ipd = "lr";
-                context.bpd = "tb";
+    /* add to parent */
 
-            } else if (wdir === "rltb" || wdir === "rl") {
+    dom_parent.appendChild(e);
 
-                context.ipd = "rl";
-                context.bpd = "tb";
+    /* override UA default margin */
+    /* TODO: should apply to <p> only */
 
-            } else if (wdir === "tblr") {
+    e.style.margin = "0";
 
-                context.ipd = "tb";
-                context.bpd = "lr";
+    /* determine ipd and bpd */
 
-            } else if (wdir === "tbrl" || wdir === "tb") {
+    if (isd_element.kind === "region") {
 
-                context.ipd = "tb";
-                context.bpd = "rl";
+        var wdir = isd_element.styleAttrs[byName.writingMode.qname];
 
-            }
- 
-        } else if (isd_element.kind === "p" && context.bpd === "tb") {
+        if (wdir === "lrtb" || wdir === "lr") {
+
+            context.ipd = "lr";
+            context.bpd = "tb";
+
+        } else if (wdir === "rltb" || wdir === "rl") {
+
+            context.ipd = "rl";
+            context.bpd = "tb";
+
+        } else if (wdir === "tblr") {
 
-            var pdir = isd_element.styleAttrs[imscStyles.byName.direction.qname];
+            context.ipd = "tb";
+            context.bpd = "lr";
+
+        } else if (wdir === "tbrl" || wdir === "tb") {
+
+            context.ipd = "tb";
+            context.bpd = "rl";
 
-            context.ipd = pdir === "ltr" ? "lr" : "rl"; 
- 
         }
 
-        /* tranform TTML styles to CSS styles */
+    } else if (isd_element.kind === "p" && context.bpd === "tb") {
+
+        var pdir = isd_element.styleAttrs[byName.direction.qname];
 
-        for (var i = 0; i < STYLING_MAP_DEFS.length; i++) {
+        context.ipd = pdir === "ltr" ? "lr" : "rl";
 
-            var sm = STYLING_MAP_DEFS[i];
+    }
 
-            var attr = isd_element.styleAttrs[sm.qname];
+    /* tranform TTML styles to CSS styles */
 
-            if (attr !== undefined && sm.map !== null) {
+    for (var i = 0; i < STYLING_MAP_DEFS.length; i++) {
 
-                sm.map(context, e, isd_element, attr);
+        var sm = STYLING_MAP_DEFS[i];
 
-            }
+        var attr = isd_element.styleAttrs[sm.qname];
+
+        if (attr !== undefined && sm.map !== null) {
+
+            sm.map(context, e, isd_element, attr);
 
         }
 
-        var proc_e = e;
+    }
 
-        /* do we have linePadding ? */
+    var proc_e = e;
 
-        var lp = isd_element.styleAttrs[imscStyles.byName.linePadding.qname];
+    /* do we have linePadding ? */
 
-        if (lp && (! lp.isZero())) {
+    var lp = isd_element.styleAttrs[byName.linePadding.qname];
 
-            var plength = lp.toUsedLength(context.w, context.h);
+    if (lp && (!lp.isZero())) {
 
+        var plength = lp.toUsedLength(context.w, context.h);
 
-            if (plength > 0) {
-                
-                /* apply padding to the <p> so that line padding does not cause line wraps */
 
-                var padmeasure = Math.ceil(plength) + "px";
+        if (plength > 0) {
 
-                if (context.bpd === "tb") {
+            /* apply padding to the <p> so that line padding does not cause line wraps */
 
-                    proc_e.style.paddingLeft = padmeasure;
-                    proc_e.style.paddingRight = padmeasure;
+            var padmeasure = Math.ceil(plength) + "px";
 
-                } else {
+            if (context.bpd === "tb") {
 
-                    proc_e.style.paddingTop = padmeasure;
-                    proc_e.style.paddingBottom = padmeasure;
+                proc_e.style.paddingLeft = padmeasure;
+                proc_e.style.paddingRight = padmeasure;
 
-                }
+            } else {
+
+                proc_e.style.paddingTop = padmeasure;
+                proc_e.style.paddingBottom = padmeasure;
 
-                context.lp = lp;
             }
+
+            context.lp = lp;
         }
+    }
 
-        // do we have multiRowAlign?
+    // do we have multiRowAlign?
 
-        var mra = isd_element.styleAttrs[imscStyles.byName.multiRowAlign.qname];
+    var mra = isd_element.styleAttrs[byName.multiRowAlign.qname];
 
-        if (mra && mra !== "auto") {
+    if (mra && mra !== "auto") {
 
-            /* create inline block to handle multirowAlign */
+        /* create inline block to handle multirowAlign */
 
-            var s = document.createElement("span");
+        var s = document.createElement("span");
 
-            s.style.display = "inline-block";
+        s.style.display = "inline-block";
 
-            s.style.textAlign = mra;
+        s.style.textAlign = mra;
 
-            e.appendChild(s);
+        e.appendChild(s);
 
-            proc_e = s;
+        proc_e = s;
 
-            context.mra = mra;
+        context.mra = mra;
 
-        }
+    }
 
-        /* do we have rubyReserve? */
+    /* do we have rubyReserve? */
 
-        var rr = isd_element.styleAttrs[imscStyles.byName.rubyReserve.qname];
+    var rr = isd_element.styleAttrs[byName.rubyReserve.qname];
 
-        if (rr && rr[0] !== "none") {
-            context.rubyReserve = rr;
-        }
+    if (rr && rr[0] !== "none") {
+        context.rubyReserve = rr;
+    }
 
 
-        /* remember we are filling line gaps */
+    /* remember we are filling line gaps */
 
-        if (isd_element.styleAttrs[imscStyles.byName.fillLineGap.qname]) {
-            context.flg = true;
-        }
+    if (isd_element.styleAttrs[byName.fillLineGap.qname]) {
+        context.flg = true;
+    }
 
 
-        if (isd_element.kind === "span" && isd_element.text) {
+    if (isd_element.kind === "span" && isd_element.text) {
 
-            var te = isd_element.styleAttrs[imscStyles.byName.textEmphasis.qname];
+        var te = isd_element.styleAttrs[byName.textEmphasis.qname];
 
-            if (te && te.style !== "none") {
+        if (te && te.style !== "none") {
 
-                context.textEmphasis = true;
+            context.textEmphasis = true;
 
-            }
+        }
 
-            if (imscStyles.byName.textCombine.qname in isd_element.styleAttrs &&
-                    isd_element.styleAttrs[imscStyles.byName.textCombine.qname] === "all") {
+        if (byName.textCombine.qname in isd_element.styleAttrs &&
+            isd_element.styleAttrs[byName.textCombine.qname] === "all") {
 
-                /* ignore tate-chu-yoku since line break cannot happen within */
-                e.textContent = isd_element.text;
-                e._isd_element = isd_element;
+            /* ignore tate-chu-yoku since line break cannot happen within */
+            e.textContent = isd_element.text;
+            e._isd_element = isd_element;
 
-                if (te) {
+            if (te) {
 
-                    applyTextEmphasis(context, e, isd_element, te);
+                applyTextEmphasis(context, e, isd_element, te);
 
-                };
+            };
 
-            } else {
+        } else {
 
-                // wrap characters in spans to find the line wrap locations
+            // wrap characters in spans to find the line wrap locations
 
-                var cbuf = '';
+            var cbuf = '';
 
-                for (var j = 0; j < isd_element.text.length; j++) {
+            for (var j = 0; j < isd_element.text.length; j++) {
 
-                    cbuf += isd_element.text.charAt(j);
+                cbuf += isd_element.text.charAt(j);
 
-                    var cc = isd_element.text.charCodeAt(j);
+                var cc = isd_element.text.charCodeAt(j);
 
-                    if (cc < 0xD800 || cc > 0xDBFF || j === isd_element.text.length - 1) {
+                if (cc < 0xD800 || cc > 0xDBFF || j === isd_element.text.length - 1) {
 
-                        /* wrap the character(s) in a span unless it is a high surrogate */
+                    /* wrap the character(s) in a span unless it is a high surrogate */
 
-                        var span = document.createElement("span");
+                    var span = document.createElement("span");
 
-                        span.textContent = cbuf;
+                    span.textContent = cbuf;
 
-                        /* apply textEmphasis */
-                        
-                        if (te) {
+                    /* apply textEmphasis */
 
-                            applyTextEmphasis(context, span, isd_element, te);
+                    if (te) {
 
-                        };
-    
-                        e.appendChild(span);
+                        applyTextEmphasis(context, span, isd_element, te);
 
-                        cbuf = '';
+                    };
 
-                        //For the sake of merging these back together, record what isd element generated it.
-                        span._isd_element = isd_element;
-                    }
+                    e.appendChild(span);
+
+                    cbuf = '';
 
+                    //For the sake of merging these back together, record what isd element generated it.
+                    span._isd_element = isd_element;
                 }
 
             }
+
         }
+    }
 
-        /* process the children of the ISD element */
+    /* process the children of the ISD element */
 
-        if ("contents" in isd_element) {
+    if ("contents" in isd_element) {
 
-            for (var k = 0; k < isd_element.contents.length; k++) {
+        for (var k = 0; k < isd_element.contents.length; k++) {
 
-                processElement(context, proc_e, isd_element.contents[k], isd_element);
-
-            }
+            processElement(context, proc_e, isd_element.contents[k], isd_element);
 
         }
 
-        /* list of lines */
+    }
 
-        var linelist = [];
+    /* list of lines */
 
+    var linelist = [];
 
-        /* paragraph processing */
-        /* TODO: linePadding only supported for horizontal scripts */
 
-        if (isd_element.kind === "p") {
+    /* paragraph processing */
+    /* TODO: linePadding only supported for horizontal scripts */
 
-            constructLineList(context, proc_e, linelist, null);
+    if (isd_element.kind === "p") {
 
-            /* apply rubyReserve */
+        constructLineList(context, proc_e, linelist, null);
 
-            if (context.rubyReserve) {
+        /* apply rubyReserve */
 
-                applyRubyReserve(linelist, context);
+        if (context.rubyReserve) {
 
-                context.rubyReserve = null;
+            applyRubyReserve(linelist, context);
 
-            }
+            context.rubyReserve = null;
 
-            /* apply tts:rubyPosition="outside" */
+        }
 
-            if (context.ruby || context.rubyReserve) {
+        /* apply tts:rubyPosition="outside" */
 
-                applyRubyPosition(linelist, context);
+        if (context.ruby || context.rubyReserve) {
 
-                context.ruby = null;
+            applyRubyPosition(linelist, context);
 
-            }
+            context.ruby = null;
 
-            /* apply text emphasis "outside" position */
+        }
 
-            if (context.textEmphasis) {
+        /* apply text emphasis "outside" position */
 
-                applyTextEmphasisOutside(linelist, context);
+        if (context.textEmphasis) {
 
-                context.textEmphasis = null;
+            applyTextEmphasisOutside(linelist, context);
 
-            }
+            context.textEmphasis = null;
 
-            /* insert line breaks for multirowalign */
+        }
 
-            if (context.mra) {
+        /* insert line breaks for multirowalign */
 
-                applyMultiRowAlign(linelist);
+        if (context.mra) {
 
-                context.mra = null;
+            applyMultiRowAlign(linelist);
 
-            }
+            context.mra = null;
 
-            /* add linepadding */
+        }
 
-            if (context.lp) {
+        /* add linepadding */
 
-                applyLinePadding(linelist, context.lp.toUsedLength(context.w, context.h), context);
+        if (context.lp) {
 
-                context.lp = null;
+            applyLinePadding(linelist, context.lp.toUsedLength(context.w, context.h), context);
 
-            }
+            context.lp = null;
 
-            mergeSpans(linelist, context); // The earlier we can do this the less processing there will be.
+        }
 
-            /* fill line gaps linepadding */
+        mergeSpans(linelist, context); // The earlier we can do this the less processing there will be.
 
-            if (context.flg) {
+        /* fill line gaps linepadding */
 
-                var par_edges = rect2edges(proc_e.getBoundingClientRect(), context);
+        if (context.flg) {
 
-                applyFillLineGap(linelist, par_edges.before, par_edges.after, context, proc_e);
+            var par_edges = rect2edges(proc_e.getBoundingClientRect(), context);
 
-                context.flg = null;
+            applyFillLineGap(linelist, par_edges.before, par_edges.after, context, proc_e);
 
-            }
+            context.flg = null;
 
         }
 
+    }
 
-        /* region processing */
 
-        if (isd_element.kind === "region") {
+    /* region processing */
 
-            /* perform roll up if needed */
-            if ((context.bpd === "tb") &&
-                    context.enableRollUp &&
-                    isd_element.contents.length > 0 &&
-                    isd_element.styleAttrs[imscStyles.byName.displayAlign.qname] === 'after') {
+    if (isd_element.kind === "region") {
 
-                /* build line list */
-                constructLineList(context, proc_e, linelist, null);
+        /* perform roll up if needed */
+        if ((context.bpd === "tb") &&
+            context.enableRollUp &&
+            isd_element.contents.length > 0 &&
+            isd_element.styleAttrs[byName.displayAlign.qname] === 'after') {
 
-                /* horrible hack, perhaps default region id should be underscore everywhere? */
+            /* build line list */
+            constructLineList(context, proc_e, linelist, null);
 
-                var rid = isd_element.id === '' ? '_' : isd_element.id;
+            /* horrible hack, perhaps default region id should be underscore everywhere? */
 
-                var rb = new RegionPBuffer(rid, linelist);
+            var rid = isd_element.id === '' ? '_' : isd_element.id;
 
-                context.currentISDState[rb.id] = rb;
+            var rb = new RegionPBuffer(rid, linelist);
 
-                if (context.previousISDState &&
-                        rb.id in context.previousISDState &&
-                        context.previousISDState[rb.id].plist.length > 0 &&
-                        rb.plist.length > 1 &&
-                        rb.plist[rb.plist.length - 2].text ===
-                        context.previousISDState[rb.id].plist[context.previousISDState[rb.id].plist.length - 1].text) {
+            context.currentISDState[rb.id] = rb;
 
-                    var body_elem = e.firstElementChild;
+            if (context.previousISDState &&
+                rb.id in context.previousISDState &&
+                context.previousISDState[rb.id].plist.length > 0 &&
+                rb.plist.length > 1 &&
+                rb.plist[rb.plist.length - 2].text ===
+                context.previousISDState[rb.id].plist[context.previousISDState[rb.id].plist.length - 1].text) {
 
-                    var h = rb.plist[rb.plist.length - 1].after - rb.plist[rb.plist.length - 1].before;
+                var body_elem = e.firstElementChild;
 
-                    body_elem.style.bottom = "-" + h + "px";
-                    body_elem.style.transition = "transform 0.4s";
-                    body_elem.style.position = "relative";
-                    body_elem.style.transform = "translateY(-" + h + "px)";
+                var h = rb.plist[rb.plist.length - 1].after - rb.plist[rb.plist.length - 1].before;
 
-                }
+                body_elem.style.bottom = "-" + h + "px";
+                body_elem.style.transition = "transform 0.4s";
+                body_elem.style.position = "relative";
+                body_elem.style.transform = "translateY(-" + h + "px)";
 
             }
+
         }
     }
+}
 
-    function mergeSpans(lineList, context) {
+function mergeSpans(lineList, context) {
 
-        for (var i = 0; i < lineList.length; i++) {
+    for (var i = 0; i < lineList.length; i++) {
 
-            var line = lineList[i];
+        var line = lineList[i];
 
-            for (var j = 1; j < line.elements.length;) {
+        for (var j = 1; j < line.elements.length;) {
 
-                var previous = line.elements[j - 1];
-                var span = line.elements[j];
+            var previous = line.elements[j - 1];
+            var span = line.elements[j];
 
-                if (spanMerge(previous.node, span.node, context)) {
+            if (spanMerge(previous.node, span.node, context)) {
 
-                    //removed from DOM by spanMerge(), remove from the list too.
-                    line.elements.splice(j, 1);
-                    continue;
+                //removed from DOM by spanMerge(), remove from the list too.
+                line.elements.splice(j, 1);
+                continue;
 
-                } else {
+            } else {
 
-                    j++;
-
-                }
+                j++;
 
             }
+
         }
+    }
 
-        // Copy backgroundColor to each span so that fillLineGap will apply padding to elements with the right background
-        var thisNode, ancestorBackgroundColor;
-        var clearTheseBackgrounds = [];
+    // Copy backgroundColor to each span so that fillLineGap will apply padding to elements with the right background
+    var thisNode, ancestorBackgroundColor;
+    var clearTheseBackgrounds = [];
 
-        for (var l = 0; l < lineList.length; l++) {
+    for (var l = 0; l < lineList.length; l++) {
 
-            for (var el = 0; el < lineList[l].elements.length; el++) {
+        for (var el = 0; el < lineList[l].elements.length; el++) {
 
-                thisNode = lineList[l].elements[el].node;
-                ancestorBackgroundColor = getSpanAncestorColor(thisNode, clearTheseBackgrounds, false);
+            thisNode = lineList[l].elements[el].node;
+            ancestorBackgroundColor = getSpanAncestorColor(thisNode, clearTheseBackgrounds, false);
 
-                if (ancestorBackgroundColor) {
+            if (ancestorBackgroundColor) {
 
-                    thisNode.style.backgroundColor = ancestorBackgroundColor;
+                thisNode.style.backgroundColor = ancestorBackgroundColor;
 
-                }
             }
         }
+    }
 
-        for (var bi = 0; bi < clearTheseBackgrounds.length; bi++) {
+    for (var bi = 0; bi < clearTheseBackgrounds.length; bi++) {
 
-            clearTheseBackgrounds[bi].style.backgroundColor = "";
+        clearTheseBackgrounds[bi].style.backgroundColor = "";
 
-        }
     }
+}
 
-    function getSpanAncestorColor(element, ancestorList, isAncestor) {
-
-        if (element.style.backgroundColor) {
+function getSpanAncestorColor(element, ancestorList, isAncestor) {
 
-            if (isAncestor && !ancestorList.includes(element)) {
+    if (element.style.backgroundColor) {
 
-                ancestorList.push(element);
+        if (isAncestor && !ancestorList.includes(element)) {
 
-            }
-            return element.style.backgroundColor;
+            ancestorList.push(element);
 
-        } else {
+        }
+        return element.style.backgroundColor;
 
-            if (element.parentElement.nodeName === "SPAN" ||
-                element.parentElement.nodeName === "RUBY" ||
-                element.parentElement.nodeName === "RBC" ||
-                element.parentElement.nodeName === "RTC" ||
-                element.parentElement.nodeName === "RT") {
+    } else {
 
-                return getSpanAncestorColor(element.parentElement, ancestorList, true);
+        if (element.parentElement.nodeName === "SPAN" ||
+            element.parentElement.nodeName === "RUBY" ||
+            element.parentElement.nodeName === "RBC" ||
+            element.parentElement.nodeName === "RTC" ||
+            element.parentElement.nodeName === "RT") {
 
-            }
+            return getSpanAncestorColor(element.parentElement, ancestorList, true);
 
         }
 
-        return undefined;
     }
 
-    function spanMerge(first, second, context) {
+    return undefined;
+}
 
-        if (first.tagName === "SPAN" &&
-            second.tagName === "SPAN" &&
-            first._isd_element === second._isd_element) {
-                if (! first._isd_element) {
-                    /* we should never get here since every span should have a source ISD element */
-                    reportError(context.errorHandler, "Internal error: HTML span is not linked to a source element; cannot merge spans.");
-                    return false;
-                }
+function spanMerge(first, second, context) {
 
-                first.textContent += second.textContent;
+    if (first.tagName === "SPAN" &&
+        second.tagName === "SPAN" &&
+        first._isd_element === second._isd_element) {
+        if (!first._isd_element) {
+            /* we should never get here since every span should have a source ISD element */
+            reportError(context.errorHandler, "Internal error: HTML span is not linked to a source element; cannot merge spans.");
+            return false;
+        }
 
-                for (var i = 0; i < second.style.length; i++) {
+        first.textContent += second.textContent;
 
-                    var styleName = second.style[i];
-                    if (styleName.indexOf("border") >= 0 || 
-                        styleName.indexOf("padding") >= 0 ||
-                        styleName.indexOf("margin") >= 0) {
+        for (var i = 0; i < second.style.length; i++) {
 
-                        first.style[styleName] = second.style[styleName];
+            var styleName = second.style[i];
+            if (styleName.indexOf("border") >= 0 ||
+                styleName.indexOf("padding") >= 0 ||
+                styleName.indexOf("margin") >= 0) {
 
-                    }
-                }
-
-                second.parentElement.removeChild(second);
+                first.style[styleName] = second.style[styleName];
 
-                return true;
             }
+        }
 
-        return false;
+        second.parentElement.removeChild(second);
+
+        return true;
     }
 
-    function applyLinePadding(lineList, lp, context) {
+    return false;
+}
 
-        if (lineList === null) return;
+function applyLinePadding(lineList, lp, context) {
 
-        for (var i = 0; i < lineList.length; i++) {
+    if (lineList === null) return;
 
-            var l = lineList[i].elements.length;
+    for (var i = 0; i < lineList.length; i++) {
 
-            var pospadpxlen = Math.ceil(lp) + "px";
+        var l = lineList[i].elements.length;
 
-            var negpadpxlen = "-" + Math.ceil(lp) + "px";
+        var pospadpxlen = Math.ceil(lp) + "px";
 
-            if (l !== 0) {
+        var negpadpxlen = "-" + Math.ceil(lp) + "px";
 
-                var se = lineList[i].elements[lineList[i].start_elem];
+        if (l !== 0) {
 
-                var ee = lineList[i].elements[lineList[i].end_elem];
+            var se = lineList[i].elements[lineList[i].start_elem];
 
-                if (se === ee) {
+            var ee = lineList[i].elements[lineList[i].end_elem];
 
-                    // Check to see if there's any background at all
-                    var elementBoundingRect = se.node.getBoundingClientRect();
-                    
-                    if (elementBoundingRect.width == 0 || elementBoundingRect.height == 0) {
+            if (se === ee) {
 
-                        // There's no background on this line, move on.
-                        continue;
+                // Check to see if there's any background at all
+                var elementBoundingRect = se.node.getBoundingClientRect();
 
-                    }
+                if (elementBoundingRect.width == 0 || elementBoundingRect.height == 0) {
+
+                    // There's no background on this line, move on.
+                    continue;
 
                 }
 
-                // Start element
-                if (context.ipd === "lr") {
+            }
 
-                    se.node.style.marginLeft = negpadpxlen;
-                    se.node.style.paddingLeft = pospadpxlen;
+            // Start element
+            if (context.ipd === "lr") {
 
-                } else if (context.ipd === "rl") {
+                se.node.style.marginLeft = negpadpxlen;
+                se.node.style.paddingLeft = pospadpxlen;
 
-                    se.node.style.paddingRight = pospadpxlen;
-                    se.node.style.marginRight = negpadpxlen;
+            } else if (context.ipd === "rl") {
 
-                } else if (context.ipd === "tb") {
+                se.node.style.paddingRight = pospadpxlen;
+                se.node.style.marginRight = negpadpxlen;
 
-                    se.node.style.paddingTop = pospadpxlen;
-                    se.node.style.marginTop = negpadpxlen;
+            } else if (context.ipd === "tb") {
 
-                }
+                se.node.style.paddingTop = pospadpxlen;
+                se.node.style.marginTop = negpadpxlen;
 
-                // End element
-                if (context.ipd === "lr") {
+            }
 
-                    // Firefox has a problem with line-breaking when a negative margin is applied.
-                    // The positioning will be wrong but don't apply when on firefox.
-                    // https://bugzilla.mozilla.org/show_bug.cgi?id=1502610
-                    if (!browserIsFirefox) {
-                        ee.node.style.marginRight = negpadpxlen;
-                    }
-                    ee.node.style.paddingRight = pospadpxlen;
+            // End element
+            if (context.ipd === "lr") {
 
-                } else if (context.ipd === "rl") {
+                // Firefox has a problem with line-breaking when a negative margin is applied.
+                // The positioning will be wrong but don't apply when on firefox.
+                // https://bugzilla.mozilla.org/show_bug.cgi?id=1502610
+                if (!browserIsFirefox) {
+                    ee.node.style.marginRight = negpadpxlen;
+                }
+                ee.node.style.paddingRight = pospadpxlen;
 
-                    ee.node.style.paddingLeft = pospadpxlen;
-                    if (!browserIsFirefox) {
-                        ee.node.style.marginLeft = negpadpxlen;
-                    }
+            } else if (context.ipd === "rl") {
 
-                } else if (context.ipd === "tb") {
+                ee.node.style.paddingLeft = pospadpxlen;
+                if (!browserIsFirefox) {
+                    ee.node.style.marginLeft = negpadpxlen;
+                }
 
-                    ee.node.style.paddingBottom = pospadpxlen;
-                    ee.node.style.marginBottom = negpadpxlen;
+            } else if (context.ipd === "tb") {
 
-                }
+                ee.node.style.paddingBottom = pospadpxlen;
+                ee.node.style.marginBottom = negpadpxlen;
 
             }
 
@@ -780,254 +779,254 @@ var browserIsFirefox = /firefox/i.test(navigator.userAgent);
 
     }
 
-    function applyMultiRowAlign(lineList) {
+}
 
-        /* apply an explicit br to all but the last line */
+function applyMultiRowAlign(lineList) {
 
-        for (var i = 0; i < lineList.length - 1; i++) {
+    /* apply an explicit br to all but the last line */
 
-            var l = lineList[i].elements.length;
+    for (var i = 0; i < lineList.length - 1; i++) {
 
-            if (l !== 0 && lineList[i].br === false) {
-                var br = document.createElement("br");
+        var l = lineList[i].elements.length;
 
-                var lastnode = lineList[i].elements[l - 1].node;
+        if (l !== 0 && lineList[i].br === false) {
+            var br = document.createElement("br");
 
-                lastnode.parentElement.insertBefore(br, lastnode.nextSibling);
-            }
+            var lastnode = lineList[i].elements[l - 1].node;
 
+            lastnode.parentElement.insertBefore(br, lastnode.nextSibling);
         }
 
     }
 
-    function applyTextEmphasisOutside(lineList, context) {
+}
 
-        /* supports "outside" only */
+function applyTextEmphasisOutside(lineList, context) {
 
-        for (var i = 0; i < lineList.length; i++) {
+    /* supports "outside" only */
 
-            for (var j = 0; j < lineList[i].te.length; j++) {
+    for (var i = 0; i < lineList.length; i++) {
 
-                /* skip if position already set */
+        for (var j = 0; j < lineList[i].te.length; j++) {
 
-                if (lineList[i].te[j].style[TEXTEMPHASISPOSITION_PROP] &&
-                    lineList[i].te[j].style[TEXTEMPHASISPOSITION_PROP] !== "none")
-                    continue;
+            /* skip if position already set */
 
-                var pos;
+            if (lineList[i].te[j].style[TEXTEMPHASISPOSITION_PROP] &&
+                lineList[i].te[j].style[TEXTEMPHASISPOSITION_PROP] !== "none")
+                continue;
 
-                if (context.bpd === "tb") {
+            var pos;
 
-                    pos = (i === 0) ? "left over" : "left under";
+            if (context.bpd === "tb") {
 
+                pos = (i === 0) ? "left over" : "left under";
 
-                } else {
 
-                    if (context.bpd === "rl") {
+            } else {
 
-                        pos = (i === 0) ? "right under" : "left under";
+                if (context.bpd === "rl") {
 
-                    } else {
+                    pos = (i === 0) ? "right under" : "left under";
 
-                        pos = (i === 0) ? "left under" : "right under";
+                } else {
 
-                    }
+                    pos = (i === 0) ? "left under" : "right under";
 
                 }
 
-                lineList[i].te[j].style[TEXTEMPHASISPOSITION_PROP] = pos;
-
             }
 
+            lineList[i].te[j].style[TEXTEMPHASISPOSITION_PROP] = pos;
+
         }
 
     }
 
-    function applyRubyPosition(lineList, context) {
+}
 
-        for (var i = 0; i < lineList.length; i++) {
+function applyRubyPosition(lineList, context) {
 
-            for (var j = 0; j < lineList[i].rbc.length; j++) {
+    for (var i = 0; i < lineList.length; i++) {
 
-                /* skip if ruby-position already set */
+        for (var j = 0; j < lineList[i].rbc.length; j++) {
 
-                if (lineList[i].rbc[j].style[RUBYPOSITION_PROP])
-                    continue;
+            /* skip if ruby-position already set */
 
-                var pos;
+            if (lineList[i].rbc[j].style[RUBYPOSITION_PROP])
+                continue;
 
-                if (RUBYPOSITION_ISWK) {
+            var pos;
 
-                    /* WebKit exception */
+            if (RUBYPOSITION_ISWK) {
 
-                    pos = (i === 0) ? "before" : "after";
+                /* WebKit exception */
 
-                } else if (context.bpd === "tb") {
+                pos = (i === 0) ? "before" : "after";
 
-                    pos = (i === 0) ? "over" : "under";
+            } else if (context.bpd === "tb") {
 
+                pos = (i === 0) ? "over" : "under";
 
-                } else {
 
-                    if (context.bpd === "rl") {
+            } else {
 
-                        pos = (i === 0) ? "over" : "under";
+                if (context.bpd === "rl") {
 
-                    } else {
+                    pos = (i === 0) ? "over" : "under";
 
-                        pos = (i === 0) ? "under" : "over";
+                } else {
 
-                    }
+                    pos = (i === 0) ? "under" : "over";
 
                 }
 
-                lineList[i].rbc[j].style[RUBYPOSITION_PROP] = pos;
-
             }
 
+            lineList[i].rbc[j].style[RUBYPOSITION_PROP] = pos;
+
         }
 
     }
 
-    function applyRubyReserve(lineList, context) {
+}
 
-        for (var i = 0; i < lineList.length; i++) {
+function applyRubyReserve(lineList, context) {
 
-            var ruby = document.createElement("ruby");
+    for (var i = 0; i < lineList.length; i++) {
 
-            var rb = document.createElement("span");  // rb element is deprecated in HTML
-            rb.textContent = "\u200B";
+        var ruby = document.createElement("ruby");
 
-            ruby.appendChild(rb);
+        var rb = document.createElement("span");  // rb element is deprecated in HTML
+        rb.textContent = "\u200B";
 
-            var rt1;
-            var rt2;
+        ruby.appendChild(rb);
 
-            var fs = context.rubyReserve[1].toUsedLength(context.w, context.h) + "px";
+        var rt1;
+        var rt2;
 
-            if (context.rubyReserve[0] === "both" || (context.rubyReserve[0] === "outside" && lineList.length == 1)) {
+        var fs = context.rubyReserve[1].toUsedLength(context.w, context.h) + "px";
 
-                rt1 = document.createElement("rtc");
-                rt1.style[RUBYPOSITION_PROP] = RUBYPOSITION_ISWK ? "after" : "under";
-                rt1.textContent = "\u200B";
-                rt1.style.fontSize = fs;
+        if (context.rubyReserve[0] === "both" || (context.rubyReserve[0] === "outside" && lineList.length == 1)) {
 
-                rt2 = document.createElement("rtc");
-                rt2.style[RUBYPOSITION_PROP] = RUBYPOSITION_ISWK ? "before" : "over";
-                rt2.textContent = "\u200B";
-                rt2.style.fontSize = fs;
+            rt1 = document.createElement("rtc");
+            rt1.style[RUBYPOSITION_PROP] = RUBYPOSITION_ISWK ? "after" : "under";
+            rt1.textContent = "\u200B";
+            rt1.style.fontSize = fs;
 
-                ruby.appendChild(rt1);
-                ruby.appendChild(rt2);
+            rt2 = document.createElement("rtc");
+            rt2.style[RUBYPOSITION_PROP] = RUBYPOSITION_ISWK ? "before" : "over";
+            rt2.textContent = "\u200B";
+            rt2.style.fontSize = fs;
 
-            } else {
+            ruby.appendChild(rt1);
+            ruby.appendChild(rt2);
 
-                rt1 = document.createElement("rtc");
-                rt1.textContent = "\u200B";
-                rt1.style.fontSize = fs;
+        } else {
 
-                var pos;
+            rt1 = document.createElement("rtc");
+            rt1.textContent = "\u200B";
+            rt1.style.fontSize = fs;
 
-                if (context.rubyReserve[0] === "after" || (context.rubyReserve[0] === "outside" && i > 0)) {
+            var pos;
 
-                    pos = RUBYPOSITION_ISWK ? "after" : ((context.bpd === "tb" || context.bpd === "rl") ? "under" : "over");
+            if (context.rubyReserve[0] === "after" || (context.rubyReserve[0] === "outside" && i > 0)) {
 
-                } else {
+                pos = RUBYPOSITION_ISWK ? "after" : ((context.bpd === "tb" || context.bpd === "rl") ? "under" : "over");
 
-                    pos = RUBYPOSITION_ISWK ? "before" : ((context.bpd === "tb" || context.bpd === "rl") ? "over" : "under");
+            } else {
 
-                }
+                pos = RUBYPOSITION_ISWK ? "before" : ((context.bpd === "tb" || context.bpd === "rl") ? "over" : "under");
 
-                rt1.style[RUBYPOSITION_PROP] = pos;
+            }
 
-                ruby.appendChild(rt1);
+            rt1.style[RUBYPOSITION_PROP] = pos;
 
-            }
+            ruby.appendChild(rt1);
+
+        }
 
-            /* add in front of the first ruby element of the line, if it exists */
+        /* add in front of the first ruby element of the line, if it exists */
 
-            var sib = null;
+        var sib = null;
 
-            for (var j = 0; j < lineList[i].rbc.length; j++) {
+        for (var j = 0; j < lineList[i].rbc.length; j++) {
 
-                if (lineList[i].rbc[j].localName === 'ruby') {
+            if (lineList[i].rbc[j].localName === 'ruby') {
 
-                    sib = lineList[i].rbc[j];
+                sib = lineList[i].rbc[j];
 
-                    /* copy specified style properties from the sibling ruby container */
-                    
-                    for (var k = 0; k < sib.style.length; k++) {
+                /* copy specified style properties from the sibling ruby container */
 
-                        ruby.style.setProperty(sib.style.item(k), sib.style.getPropertyValue(sib.style.item(k)));
+                for (var k = 0; k < sib.style.length; k++) {
 
-                    }
+                    ruby.style.setProperty(sib.style.item(k), sib.style.getPropertyValue(sib.style.item(k)));
 
-                    break;
                 }
 
+                break;
             }
 
-            /* otherwise add before first span */
+        }
 
-            sib = sib || lineList[i].elements[0].node;
+        /* otherwise add before first span */
 
-            sib.parentElement.insertBefore(ruby, sib);
+        sib = sib || lineList[i].elements[0].node;
 
-        }
+        sib.parentElement.insertBefore(ruby, sib);
 
     }
 
-    function applyFillLineGap(lineList, par_before, par_after, context, element) {
+}
 
-        /* positive for BPD = lr and tb, negative for BPD = rl */
-        var s = Math.sign(par_after - par_before);
+function applyFillLineGap(lineList, par_before, par_after, context, element) {
 
-        for (var i = 0; i <= lineList.length; i++) {
+    /* positive for BPD = lr and tb, negative for BPD = rl */
+    var s = Math.sign(par_after - par_before);
 
-            /* compute frontier between lines */
+    for (var i = 0; i <= lineList.length; i++) {
 
-            var frontier;
+        /* compute frontier between lines */
 
-            if (i === 0) {
+        var frontier;
 
-                frontier = Math.round(par_before);
+        if (i === 0) {
 
-            } else if (i === lineList.length) {
+            frontier = Math.round(par_before);
 
-                frontier = Math.round(par_after);
+        } else if (i === lineList.length) {
 
-            } else {
+            frontier = Math.round(par_after);
 
-                frontier = Math.round((lineList[i - 1].after + lineList[i].before) / 2);
+        } else {
 
-            }
+            frontier = Math.round((lineList[i - 1].after + lineList[i].before) / 2);
 
-            var padding;
-            var l,thisNode;
+        }
 
-            /* before line */
-            if (i > 0) {
+        var padding;
+        var l, thisNode;
 
-                if (lineList[i-1]) {
+        /* before line */
+        if (i > 0) {
 
-                    for (l = 0; l < lineList[i - 1].elements.length; l++) {
+            if (lineList[i - 1]) {
 
-                        thisNode=lineList[i - 1].elements[l];
-                        padding = s*(frontier-thisNode.after) + "px";
+                for (l = 0; l < lineList[i - 1].elements.length; l++) {
 
-                        if (context.bpd === "lr") {
+                    thisNode = lineList[i - 1].elements[l];
+                    padding = s * (frontier - thisNode.after) + "px";
 
-                            thisNode.node.style.paddingRight = padding;
+                    if (context.bpd === "lr") {
 
-                        } else if (context.bpd === "rl") {
+                        thisNode.node.style.paddingRight = padding;
 
-                            thisNode.node.style.paddingLeft = padding;
+                    } else if (context.bpd === "rl") {
 
-                        } else if (context.bpd === "tb") {
+                        thisNode.node.style.paddingLeft = padding;
 
-                            thisNode.node.style.paddingBottom = padding;
+                    } else if (context.bpd === "tb") {
 
-                        }
+                        thisNode.node.style.paddingBottom = padding;
 
                     }
 
@@ -1035,831 +1034,823 @@ var browserIsFirefox = /firefox/i.test(navigator.userAgent);
 
             }
 
-            /* after line */
-            if (i < lineList.length) {
+        }
 
-                for (l = 0; l < lineList[i].elements.length; l++) {
+        /* after line */
+        if (i < lineList.length) {
 
-                    thisNode = lineList[i].elements[l];
-                    padding = s * (thisNode.before - frontier) + "px";
+            for (l = 0; l < lineList[i].elements.length; l++) {
 
-                    if (context.bpd === "lr") {
+                thisNode = lineList[i].elements[l];
+                padding = s * (thisNode.before - frontier) + "px";
 
-                        thisNode.node.style.paddingLeft = padding;
+                if (context.bpd === "lr") {
 
-                    } else if (context.bpd === "rl") {
+                    thisNode.node.style.paddingLeft = padding;
 
-                        thisNode.node.style.paddingRight = padding;
+                } else if (context.bpd === "rl") {
 
-                    } else if (context.bpd === "tb") {
+                    thisNode.node.style.paddingRight = padding;
 
-                        thisNode.node.style.paddingTop = padding;
+                } else if (context.bpd === "tb") {
 
-                    }
-                }
+                    thisNode.node.style.paddingTop = padding;
 
+                }
             }
 
         }
 
     }
 
-    function RegionPBuffer(id, lineList) {
+}
+
+class RegionPBuffer {
+    constructor(id, lineList) {
 
         this.id = id;
 
         this.plist = lineList;
 
     }
+}
 
-    function rect2edges(rect, context) {
-
-        var edges = {before: null, after: null, start: null, end: null};
+function rect2edges(rect, context) {
 
-        if (context.bpd === "tb") {
-
-            edges.before = rect.top;
-            edges.after = rect.bottom;
+    var edges = { before: null, after: null, start: null, end: null };
 
-            if (context.ipd === "lr") {
+    if (context.bpd === "tb") {
 
-                edges.start = rect.left;
-                edges.end = rect.right;
+        edges.before = rect.top;
+        edges.after = rect.bottom;
 
-            } else {
+        if (context.ipd === "lr") {
 
-                edges.start = rect.right;
-                edges.end = rect.left;
-            }
+            edges.start = rect.left;
+            edges.end = rect.right;
 
-        } else if (context.bpd === "lr") {
+        } else {
 
-            edges.before = rect.left;
-            edges.after = rect.right;
-            edges.start = rect.top;
-            edges.end = rect.bottom;
+            edges.start = rect.right;
+            edges.end = rect.left;
+        }
 
-        } else if (context.bpd === "rl") {
+    } else if (context.bpd === "lr") {
 
-            edges.before = rect.right;
-            edges.after = rect.left;
-            edges.start = rect.top;
-            edges.end = rect.bottom;
+        edges.before = rect.left;
+        edges.after = rect.right;
+        edges.start = rect.top;
+        edges.end = rect.bottom;
 
-        }
+    } else if (context.bpd === "rl") {
 
-        return edges;
+        edges.before = rect.right;
+        edges.after = rect.left;
+        edges.start = rect.top;
+        edges.end = rect.bottom;
 
     }
 
-    function constructLineList(context, element, llist, bgcolor) {
+    return edges;
 
-        if (element.localName === "rt" || element.localName === "rtc") {
+}
 
-            /* skip ruby annotations */
+function constructLineList(context, element, llist, bgcolor) {
 
-            return;
+    if (element.localName === "rt" || element.localName === "rtc") {
 
-        }
+        /* skip ruby annotations */
 
-        var curbgcolor = element.style.backgroundColor || bgcolor;
+        return;
 
-        if (element.childElementCount === 0) {
+    }
 
-            if (element.localName === 'span' || element.localName === 'rb') {
+    var curbgcolor = element.style.backgroundColor || bgcolor;
 
-                var r = element.getBoundingClientRect();
+    if (element.childElementCount === 0) {
 
-                var edges = rect2edges(r, context);
+        if (element.localName === 'span' || element.localName === 'rb') {
 
-                if (llist.length === 0 ||
-                        (!isSameLine(edges.before, edges.after, llist[llist.length - 1].before, llist[llist.length - 1].after))
-                        ) {
-                    llist.push({
-                        before: edges.before,
-                        after: edges.after,
-                        start: edges.start,
-                        end: edges.end,
-                        start_elem: 0,
-                        end_elem: 0,
-                        elements: [],
-                        rbc: [],
-                        te: [],
-                        text: "",
-                        br: false
-                    });
+            var r = element.getBoundingClientRect();
 
-                } else {
+            var edges = rect2edges(r, context);
 
-                    /* positive for BPD = lr and tb, negative for BPD = rl */
-                    var bpd_dir = Math.sign(edges.after - edges.before);
+            if (llist.length === 0 ||
+                (!isSameLine(edges.before, edges.after, llist[llist.length - 1].before, llist[llist.length - 1].after))
+            ) {
+                llist.push({
+                    before: edges.before,
+                    after: edges.after,
+                    start: edges.start,
+                    end: edges.end,
+                    start_elem: 0,
+                    end_elem: 0,
+                    elements: [],
+                    rbc: [],
+                    te: [],
+                    text: "",
+                    br: false
+                });
 
-                    /* positive for IPD = lr and tb, negative for IPD = rl */
-                    var ipd_dir = Math.sign(edges.end - edges.start);
+            } else {
 
-                    /* check if the line height has increased */
+                /* positive for BPD = lr and tb, negative for BPD = rl */
+                var bpd_dir = Math.sign(edges.after - edges.before);
 
-                    if (bpd_dir * (edges.before - llist[llist.length - 1].before) < 0) {
-                        llist[llist.length - 1].before = edges.before;
-                    }
+                /* positive for IPD = lr and tb, negative for IPD = rl */
+                var ipd_dir = Math.sign(edges.end - edges.start);
 
-                    if (bpd_dir * (edges.after - llist[llist.length - 1].after) > 0) {
-                        llist[llist.length - 1].after = edges.after;
-                    }
+                /* check if the line height has increased */
 
-                    if (ipd_dir * (edges.start - llist[llist.length - 1].start) < 0) {
-                        llist[llist.length - 1].start = edges.start;
-                        llist[llist.length - 1].start_elem = llist[llist.length - 1].elements.length;
-                    }
+                if (bpd_dir * (edges.before - llist[llist.length - 1].before) < 0) {
+                    llist[llist.length - 1].before = edges.before;
+                }
 
-                    if (ipd_dir * (edges.end - llist[llist.length - 1].end) > 0) {
-                        llist[llist.length - 1].end = edges.end;
-                        llist[llist.length - 1].end_elem = llist[llist.length - 1].elements.length;
-                    }
+                if (bpd_dir * (edges.after - llist[llist.length - 1].after) > 0) {
+                    llist[llist.length - 1].after = edges.after;
+                }
 
+                if (ipd_dir * (edges.start - llist[llist.length - 1].start) < 0) {
+                    llist[llist.length - 1].start = edges.start;
+                    llist[llist.length - 1].start_elem = llist[llist.length - 1].elements.length;
                 }
 
-                llist[llist.length - 1].text += element.textContent;
+                if (ipd_dir * (edges.end - llist[llist.length - 1].end) > 0) {
+                    llist[llist.length - 1].end = edges.end;
+                    llist[llist.length - 1].end_elem = llist[llist.length - 1].elements.length;
+                }
 
-                llist[llist.length - 1].elements.push(
-                        {
-                            node: element,
-                            bgcolor: curbgcolor,
-                            before: edges.before,
-                            after: edges.after
-                        }
-                );
+            }
 
-            } else if (element.localName === 'br' && llist.length !== 0) {
+            llist[llist.length - 1].text += element.textContent;
 
-                llist[llist.length - 1].br = true;
+            llist[llist.length - 1].elements.push(
+                {
+                    node: element,
+                    bgcolor: curbgcolor,
+                    before: edges.before,
+                    after: edges.after
+                }
+            );
 
-            }
+        } else if (element.localName === 'br' && llist.length !== 0) {
 
-        } else {
+            llist[llist.length - 1].br = true;
 
-            var child = element.firstChild;
+        }
 
-            while (child) {
+    } else {
 
-                if (child.nodeType === Node.ELEMENT_NODE) {
+        var child = element.firstChild;
 
-                    constructLineList(context, child, llist, curbgcolor);
+        while (child) {
 
-                    if (child.localName === 'ruby' || child.localName === 'rtc') {
+            if (child.nodeType === Node.ELEMENT_NODE) {
 
-                        /* remember non-empty ruby and rtc elements so that tts:rubyPosition can be applied */
+                constructLineList(context, child, llist, curbgcolor);
 
-                        if (llist.length > 0) {
+                if (child.localName === 'ruby' || child.localName === 'rtc') {
 
-                            llist[llist.length - 1].rbc.push(child);
+                    /* remember non-empty ruby and rtc elements so that tts:rubyPosition can be applied */
 
-                        }
+                    if (llist.length > 0) {
 
-                    } else if (child.localName === 'span' &&
-                            child.style[TEXTEMPHASISSTYLE_PROP] &&
-                            child.style[TEXTEMPHASISSTYLE_PROP] !== "none") {
+                        llist[llist.length - 1].rbc.push(child);
+
+                    }
 
-                        /* remember non-empty span elements with textEmphasis */
+                } else if (child.localName === 'span' &&
+                    child.style[TEXTEMPHASISSTYLE_PROP] &&
+                    child.style[TEXTEMPHASISSTYLE_PROP] !== "none") {
 
-                        if (llist.length > 0) {
+                    /* remember non-empty span elements with textEmphasis */
 
-                            llist[llist.length - 1].te.push(child);
+                    if (llist.length > 0) {
 
-                        }
+                        llist[llist.length - 1].te.push(child);
 
                     }
-                    
 
                 }
 
-                child = child.nextSibling;
+
             }
-        }
 
+            child = child.nextSibling;
+        }
     }
 
-    function isSameLine(before1, after1, before2, after2) {
+}
 
-        return ((after1 < after2) && (before1 > before2)) || ((after2 <= after1) && (before2 >= before1));
+function isSameLine(before1, after1, before2, after2) {
 
-    }
+    return ((after1 < after2) && (before1 > before2)) || ((after2 <= after1) && (before2 >= before1));
 
-    function applyTextEmphasis(context, dom_element, isd_element, attr) {
+}
 
-        /* ignore color (not used in IMSC 1.1) */
+function applyTextEmphasis(context, dom_element, isd_element, attr) {
 
-        if (attr.style === "none") {
+    /* ignore color (not used in IMSC 1.1) */
 
-            /* text-emphasis is not inherited and the default is none, so nothing to do */
-            
-            return;
-        
-        } else if (attr.style === "auto") {
+    if (attr.style === "none") {
 
-            dom_element.style[TEXTEMPHASISSTYLE_PROP] = "filled";
-        
-        } else {
+        /* text-emphasis is not inherited and the default is none, so nothing to do */
 
-            dom_element.style[TEXTEMPHASISSTYLE_PROP] =  attr.style + " " + attr.symbol;
-        }
+        return;
 
-        /* ignore "outside" position (set in postprocessing) */
+    } else if (attr.style === "auto") {
 
-        if (attr.position === "before" || attr.position === "after") {
+        dom_element.style[TEXTEMPHASISSTYLE_PROP] = "filled";
 
-            var pos;
+    } else {
 
-            if (context.bpd === "tb") {
+        dom_element.style[TEXTEMPHASISSTYLE_PROP] = attr.style + " " + attr.symbol;
+    }
 
-                pos = (attr.position === "before") ? "left over" : "left under";
+    /* ignore "outside" position (set in postprocessing) */
 
+    if (attr.position === "before" || attr.position === "after") {
 
-            } else {
+        var pos;
 
-                if (context.bpd === "rl") {
+        if (context.bpd === "tb") {
 
-                    pos = (attr.position === "before") ? "right under" : "left under";
+            pos = (attr.position === "before") ? "left over" : "left under";
 
-                } else {
 
-                    pos = (attr.position === "before") ? "left under" : "right under";
+        } else {
 
-                }
+            if (context.bpd === "rl") {
+
+                pos = (attr.position === "before") ? "right under" : "left under";
+
+            } else {
+
+                pos = (attr.position === "before") ? "left under" : "right under";
 
             }
 
-            dom_element.style[TEXTEMPHASISPOSITION_PROP] = pos;
         }
+
+        dom_element.style[TEXTEMPHASISPOSITION_PROP] = pos;
     }
+}
 
-    function HTMLStylingMapDefinition(qName, mapFunc) {
+class HTMLStylingMapDefinition {
+    constructor(qName, mapFunc) {
         this.qname = qName;
         this.map = mapFunc;
     }
+}
 
-    var STYLING_MAP_DEFS = [
-
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling backgroundColor",
-                function (context, dom_element, isd_element, attr) {
+var STYLING_MAP_DEFS = [
 
-                    /* skip if transparent */
-                    if (attr[3] === 0)
-                        return;
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling backgroundColor",
+        function (context, dom_element, isd_element, attr) {
 
-                    dom_element.style.backgroundColor = "rgba(" +
-                            attr[0].toString() + "," +
-                            attr[1].toString() + "," +
-                            attr[2].toString() + "," +
-                            (attr[3] / 255).toString() +
-                            ")";
-                }
-        ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling color",
-                function (context, dom_element, isd_element, attr) {
-                    dom_element.style.color = "rgba(" +
-                            attr[0].toString() + "," +
-                            attr[1].toString() + "," +
-                            attr[2].toString() + "," +
-                            (attr[3] / 255).toString() +
-                            ")";
-                }
-        ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling direction",
-                function (context, dom_element, isd_element, attr) {
+            /* skip if transparent */
+            if (attr[3] === 0)
+                return;
 
-                    dom_element.style.direction = attr;
+            dom_element.style.backgroundColor = "rgba(" +
+                attr[0].toString() + "," +
+                attr[1].toString() + "," +
+                attr[2].toString() + "," +
+                (attr[3] / 255).toString() +
+                ")";
+        }
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling color",
+        function (context, dom_element, isd_element, attr) {
+            dom_element.style.color = "rgba(" +
+                attr[0].toString() + "," +
+                attr[1].toString() + "," +
+                attr[2].toString() + "," +
+                (attr[3] / 255).toString() +
+                ")";
+        }
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling direction",
+        function (context, dom_element, isd_element, attr) {
 
-                }
-        ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling display",
-                function (context, dom_element, isd_element, attr) {}
-        ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling displayAlign",
-                function (context, dom_element, isd_element, attr) {
+            dom_element.style.direction = attr;
 
-                    /* see https://css-tricks.com/snippets/css/a-guide-to-flexbox/ */
+        }
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling display",
+        function (context, dom_element, isd_element, attr) { }
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling displayAlign",
+        function (context, dom_element, isd_element, attr) {
 
-                    /* TODO: is this affected by writing direction? */
+            /* see https://css-tricks.com/snippets/css/a-guide-to-flexbox/ */
 
-                    dom_element.style.display = "flex";
-                    dom_element.style.flexDirection = "column";
+            /* TODO: is this affected by writing direction? */
 
+            dom_element.style.display = "flex";
+            dom_element.style.flexDirection = "column";
 
-                    if (attr === "before") {
 
-                        dom_element.style.justifyContent = "flex-start";
+            if (attr === "before") {
 
-                    } else if (attr === "center") {
+                dom_element.style.justifyContent = "flex-start";
 
-                        dom_element.style.justifyContent = "center";
+            } else if (attr === "center") {
 
-                    } else if (attr === "after") {
+                dom_element.style.justifyContent = "center";
 
-                        dom_element.style.justifyContent = "flex-end";
-                    }
+            } else if (attr === "after") {
 
-                }
-        ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling extent",
-                function (context, dom_element, isd_element, attr) {
-                    /* TODO: this is super ugly */
+                dom_element.style.justifyContent = "flex-end";
+            }
 
-                    context.regionH = attr.h.toUsedLength(context.w, context.h);
-                    context.regionW = attr.w.toUsedLength(context.w, context.h);
+        }
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling extent",
+        function (context, dom_element, isd_element, attr) {
+            /* TODO: this is super ugly */
 
-                    /* 
-                     * CSS height/width are measured against the content rectangle,
-                     * whereas TTML height/width include padding
-                     */
+            context.regionH = attr.h.toUsedLength(context.w, context.h);
+            context.regionW = attr.w.toUsedLength(context.w, context.h);
 
-                    var hdelta = 0;
-                    var wdelta = 0;
+            /* 
+             * CSS height/width are measured against the content rectangle,
+             * whereas TTML height/width include padding
+             */
 
-                    var p = isd_element.styleAttrs["http://www.w3.org/ns/ttml#styling padding"];
+            var hdelta = 0;
+            var wdelta = 0;
 
-                    if (!p) {
+            var p = isd_element.styleAttrs["http://www.w3.org/ns/ttml#styling padding"];
 
-                        /* error */
+            if (!p) {
 
-                    } else {
+                /* error */
 
-                        hdelta = p[0].toUsedLength(context.w, context.h) + p[2].toUsedLength(context.w, context.h);
-                        wdelta = p[1].toUsedLength(context.w, context.h) + p[3].toUsedLength(context.w, context.h);
+            } else {
 
-                    }
+                hdelta = p[0].toUsedLength(context.w, context.h) + p[2].toUsedLength(context.w, context.h);
+                wdelta = p[1].toUsedLength(context.w, context.h) + p[3].toUsedLength(context.w, context.h);
 
-                    dom_element.style.height = (context.regionH - hdelta) + "px";
-                    dom_element.style.width = (context.regionW - wdelta) + "px";
+            }
 
-                }
-        ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling fontFamily",
-                function (context, dom_element, isd_element, attr) {
+            dom_element.style.height = (context.regionH - hdelta) + "px";
+            dom_element.style.width = (context.regionW - wdelta) + "px";
 
-                    var rslt = [];
+        }
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling fontFamily",
+        function (context, dom_element, isd_element, attr) {
 
-                    /* per IMSC1 */
+            var rslt = [];
 
-                    for (var i = 0; i < attr.length; i++) {
-                        attr[i] = attr[i].trim();
+            /* per IMSC1 */
 
-                        if (attr[i] === "monospaceSerif") {
+            for (var i = 0; i < attr.length; i++) {
+                attr[i] = attr[i].trim();
 
-                            rslt.push("Courier New");
-                            rslt.push('"Liberation Mono"');
-                            rslt.push("Courier");
-                            rslt.push("monospace");
+                if (attr[i] === "monospaceSerif") {
 
-                        } else if (attr[i] === "proportionalSansSerif") {
+                    rslt.push("Courier New");
+                    rslt.push('"Liberation Mono"');
+                    rslt.push("Courier");
+                    rslt.push("monospace");
 
-                            rslt.push("Arial");
-                            rslt.push("Helvetica");
-                            rslt.push('"Liberation Sans"');
-                            rslt.push("sans-serif");
+                } else if (attr[i] === "proportionalSansSerif") {
 
-                        } else if (attr[i] === "monospace") {
+                    rslt.push("Arial");
+                    rslt.push("Helvetica");
+                    rslt.push('"Liberation Sans"');
+                    rslt.push("sans-serif");
 
-                            rslt.push("monospace");
+                } else if (attr[i] === "monospace") {
 
-                        } else if (attr[i] === "sansSerif") {
+                    rslt.push("monospace");
 
-                            rslt.push("sans-serif");
+                } else if (attr[i] === "sansSerif") {
 
-                        } else if (attr[i] === "serif") {
+                    rslt.push("sans-serif");
 
-                            rslt.push("serif");
+                } else if (attr[i] === "serif") {
 
-                        } else if (attr[i] === "monospaceSansSerif") {
+                    rslt.push("serif");
 
-                            rslt.push("Consolas");
-                            rslt.push("monospace");
+                } else if (attr[i] === "monospaceSansSerif") {
 
-                        } else if (attr[i] === "proportionalSerif") {
+                    rslt.push("Consolas");
+                    rslt.push("monospace");
 
-                            rslt.push("serif");
+                } else if (attr[i] === "proportionalSerif") {
 
-                        } else {
+                    rslt.push("serif");
 
-                            rslt.push(attr[i]);
+                } else {
 
-                        }
+                    rslt.push(attr[i]);
 
-                    }
+                }
 
-                    // prune later duplicates we may have inserted 
-                    if (rslt.length > 0) {
+            }
 
-                        var unique=[rslt[0]];
+            // prune later duplicates we may have inserted 
+            if (rslt.length > 0) {
 
-                        for (var fi = 1; fi < rslt.length; fi++) {
+                var unique = [rslt[0]];
 
-                            if (unique.indexOf(rslt[fi]) == -1) {
+                for (var fi = 1; fi < rslt.length; fi++) {
 
-                                unique.push(rslt[fi]);
+                    if (unique.indexOf(rslt[fi]) == -1) {
 
-                            }
-                        }
+                        unique.push(rslt[fi]);
 
-                        rslt = unique;
                     }
-
-                    dom_element.style.fontFamily = rslt.join(",");
                 }
-        ),
 
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling shear",
-                function (context, dom_element, isd_element, attr) {
+                rslt = unique;
+            }
 
-                    /* return immediately if tts:shear is 0% since CSS transforms are not inherited*/
+            dom_element.style.fontFamily = rslt.join(",");
+        }
+    ),
 
-                    if (attr === 0)
-                        return;
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling shear",
+        function (context, dom_element, isd_element, attr) {
 
-                    var angle = attr * -0.9;
+            /* return immediately if tts:shear is 0% since CSS transforms are not inherited*/
 
-                    /* context.bpd is needed since writing mode is not inherited and sets the inline progression */
+            if (attr === 0)
+                return;
 
-                    if (context.bpd === "tb") {
+            var angle = attr * -0.9;
 
-                        dom_element.style.transform = "skewX(" + angle + "deg)";
+            /* context.bpd is needed since writing mode is not inherited and sets the inline progression */
 
-                    } else {
+            if (context.bpd === "tb") {
 
-                        dom_element.style.transform = "skewY(" + angle + "deg)";
+                dom_element.style.transform = "skewX(" + angle + "deg)";
 
-                    }
+            } else {
 
-                }
-        ),
+                dom_element.style.transform = "skewY(" + angle + "deg)";
 
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling fontSize",
-                function (context, dom_element, isd_element, attr) {
-                    dom_element.style.fontSize = attr.toUsedLength(context.w, context.h) + "px";
-                }
-        ),
+            }
 
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling fontStyle",
-                function (context, dom_element, isd_element, attr) {
-                    dom_element.style.fontStyle = attr;
-                }
-        ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling fontWeight",
-                function (context, dom_element, isd_element, attr) {
-                    dom_element.style.fontWeight = attr;
-                }
-        ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling lineHeight",
-                function (context, dom_element, isd_element, attr) {
-                    if (attr === "normal") {
+        }
+    ),
 
-                        dom_element.style.lineHeight = "normal";
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling fontSize",
+        function (context, dom_element, isd_element, attr) {
+            dom_element.style.fontSize = attr.toUsedLength(context.w, context.h) + "px";
+        }
+    ),
 
-                    } else {
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling fontStyle",
+        function (context, dom_element, isd_element, attr) {
+            dom_element.style.fontStyle = attr;
+        }
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling fontWeight",
+        function (context, dom_element, isd_element, attr) {
+            dom_element.style.fontWeight = attr;
+        }
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling lineHeight",
+        function (context, dom_element, isd_element, attr) {
+            if (attr === "normal") {
 
-                        dom_element.style.lineHeight = attr.toUsedLength(context.w, context.h) + "px";
-                    }
-                }
-        ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling opacity",
-                function (context, dom_element, isd_element, attr) {
-                    dom_element.style.opacity = attr;
-                }
-        ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling origin",
-                function (context, dom_element, isd_element, attr) {
-                    dom_element.style.top = attr.h.toUsedLength(context.w, context.h) + "px";
-                    dom_element.style.left = attr.w.toUsedLength(context.w, context.h) + "px";
-                }
-        ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling overflow",
-                function (context, dom_element, isd_element, attr) {
-                    dom_element.style.overflow = attr;
-                }
-        ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling padding",
-                function (context, dom_element, isd_element, attr) {
+                dom_element.style.lineHeight = "normal";
 
-                    /* attr: top,left,bottom,right*/
+            } else {
 
-                    /* style: top right bottom left*/
+                dom_element.style.lineHeight = attr.toUsedLength(context.w, context.h) + "px";
+            }
+        }
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling opacity",
+        function (context, dom_element, isd_element, attr) {
+            dom_element.style.opacity = attr;
+        }
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling origin",
+        function (context, dom_element, isd_element, attr) {
+            dom_element.style.top = attr.h.toUsedLength(context.w, context.h) + "px";
+            dom_element.style.left = attr.w.toUsedLength(context.w, context.h) + "px";
+        }
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling overflow",
+        function (context, dom_element, isd_element, attr) {
+            dom_element.style.overflow = attr;
+        }
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling padding",
+        function (context, dom_element, isd_element, attr) {
 
-                    var rslt = [];
+            /* attr: top,left,bottom,right*/
 
-                    rslt[0] = attr[0].toUsedLength(context.w, context.h) + "px";
-                    rslt[1] = attr[3].toUsedLength(context.w, context.h) + "px";
-                    rslt[2] = attr[2].toUsedLength(context.w, context.h) + "px";
-                    rslt[3] = attr[1].toUsedLength(context.w, context.h) + "px";
+            /* style: top right bottom left*/
 
-                    dom_element.style.padding = rslt.join(" ");
-                }
-        ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling position",
-                function (context, dom_element, isd_element, attr) {
-                    dom_element.style.top = attr.h.toUsedLength(context.w, context.h) + "px";
-                    dom_element.style.left = attr.w.toUsedLength(context.w, context.h) + "px";
-                }
-        ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling rubyAlign",
-                function (context, dom_element, isd_element, attr) {
-                    dom_element.style.rubyAlign = attr === "spaceAround" ? "space-around" : "center";
-                }
-        ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling rubyPosition",
-                function (context, dom_element, isd_element, attr) {
+            var rslt = [];
 
-                    /* skip if "outside", which is handled by applyRubyPosition() */
+            rslt[0] = attr[0].toUsedLength(context.w, context.h) + "px";
+            rslt[1] = attr[3].toUsedLength(context.w, context.h) + "px";
+            rslt[2] = attr[2].toUsedLength(context.w, context.h) + "px";
+            rslt[3] = attr[1].toUsedLength(context.w, context.h) + "px";
 
-                    if (attr === "before" || attr === "after") {
+            dom_element.style.padding = rslt.join(" ");
+        }
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling position",
+        function (context, dom_element, isd_element, attr) {
+            dom_element.style.top = attr.h.toUsedLength(context.w, context.h) + "px";
+            dom_element.style.left = attr.w.toUsedLength(context.w, context.h) + "px";
+        }
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling rubyAlign",
+        function (context, dom_element, isd_element, attr) {
+            dom_element.style.rubyAlign = attr === "spaceAround" ? "space-around" : "center";
+        }
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling rubyPosition",
+        function (context, dom_element, isd_element, attr) {
 
-                        var pos;
+            /* skip if "outside", which is handled by applyRubyPosition() */
 
-                        if (RUBYPOSITION_ISWK) {
+            if (attr === "before" || attr === "after") {
 
-                            /* WebKit exception */
-        
-                            pos = attr;
-        
-                        } else if (context.bpd === "tb") {
+                var pos;
 
-                            pos = (attr === "before") ? "over" : "under";
+                if (RUBYPOSITION_ISWK) {
 
+                    /* WebKit exception */
 
-                        } else {
+                    pos = attr;
 
-                            if (context.bpd === "rl") {
+                } else if (context.bpd === "tb") {
 
-                                pos = (attr === "before") ? "over" : "under";
+                    pos = (attr === "before") ? "over" : "under";
 
-                            } else {
 
-                                pos = (attr === "before") ? "under" : "over";
+                } else {
 
-                            }
+                    if (context.bpd === "rl") {
+
+                        pos = (attr === "before") ? "over" : "under";
 
-                        }
+                    } else {
 
-                        /* apply position to the parent dom_element, i.e. ruby or rtc */
+                        pos = (attr === "before") ? "under" : "over";
 
-                        dom_element.parentElement.style[RUBYPOSITION_PROP] = pos;
                     }
-                }
-        ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling showBackground",
-                null
-                ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling textAlign",
-                function (context, dom_element, isd_element, attr) {
 
-                    var ta;
+                }
 
-                    /* handle UAs that do not understand start or end */
+                /* apply position to the parent dom_element, i.e. ruby or rtc */
 
-                    if (attr === "start") {
+                dom_element.parentElement.style[RUBYPOSITION_PROP] = pos;
+            }
+        }
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling showBackground",
+        null
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling textAlign",
+        function (context, dom_element, isd_element, attr) {
 
-                        ta = (context.ipd === "rl") ? "right" : "left";
+            var ta;
 
-                    } else if (attr === "end") {
+            /* handle UAs that do not understand start or end */
 
-                        ta = (context.ipd === "rl") ? "left" : "right";
+            if (attr === "start") {
 
-                    } else {
+                ta = (context.ipd === "rl") ? "right" : "left";
 
-                        ta = attr;
+            } else if (attr === "end") {
 
-                    }
+                ta = (context.ipd === "rl") ? "left" : "right";
 
-                    dom_element.style.textAlign = ta;
+            } else {
 
-                }
-        ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling textDecoration",
-                function (context, dom_element, isd_element, attr) {
-                    dom_element.style.textDecoration = attr.join(" ").replace("lineThrough", "line-through");
-                }
-        ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling textOutline",
-                function (context, dom_element, isd_element, attr) {
+                ta = attr;
 
-                    /* defer to tts:textShadow */
-                }
-        ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling textShadow",
-                function (context, dom_element, isd_element, attr) {
+            }
 
-                    var txto = isd_element.styleAttrs[imscStyles.byName.textOutline.qname];
+            dom_element.style.textAlign = ta;
 
-                    if (attr === "none" && txto === "none") {
+        }
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling textDecoration",
+        function (context, dom_element, isd_element, attr) {
+            dom_element.style.textDecoration = attr.join(" ").replace("lineThrough", "line-through");
+        }
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling textOutline",
+        function (context, dom_element, isd_element, attr) {
 
-                        dom_element.style.textShadow = "";
+            /* defer to tts:textShadow */
+        }
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling textShadow",
+        function (context, dom_element, isd_element, attr) {
 
-                    } else {
+            var txto = isd_element.styleAttrs[byName.textOutline.qname];
 
-                        var s = [];
+            if (attr === "none" && txto === "none") {
 
-                        if (txto !== "none") {
+                dom_element.style.textShadow = "";
 
-                            /* emulate text outline */
+            } else {
 
-                            var to_color = "rgba(" +
-                                                txto.color[0].toString() + "," +
-                                                txto.color[1].toString() + "," +
-                                                txto.color[2].toString() + "," +
-                                                (txto.color[3] / 255).toString() +
-                                                ")";
+                var s = [];
 
-                            s.push(  "1px 1px 1px " + to_color);
-                            s.push(  "-1px 1px 1px " + to_color);
-                            s.push(  "1px -1px 1px " + to_color);
-                            s.push(  "-1px -1px 1px " + to_color);
+                if (txto !== "none") {
 
-                        }
+                    /* emulate text outline */
 
-                        /* add text shadow */
+                    var to_color = "rgba(" +
+                        txto.color[0].toString() + "," +
+                        txto.color[1].toString() + "," +
+                        txto.color[2].toString() + "," +
+                        (txto.color[3] / 255).toString() +
+                        ")";
 
-                        if (attr !== "none") {
+                    s.push("1px 1px 1px " + to_color);
+                    s.push("-1px 1px 1px " + to_color);
+                    s.push("1px -1px 1px " + to_color);
+                    s.push("-1px -1px 1px " + to_color);
 
-                            for (var i = 0; i < attr.length; i++) {
+                }
 
+                /* add text shadow */
 
-                                s.push(attr[i].x_off.toUsedLength(context.w, context.h) + "px " +
-                                        attr[i].y_off.toUsedLength(context.w, context.h) + "px " +
-                                        attr[i].b_radius.toUsedLength(context.w, context.h) + "px " +
-                                        "rgba(" +
-                                        attr[i].color[0].toString() + "," +
-                                        attr[i].color[1].toString() + "," +
-                                        attr[i].color[2].toString() + "," +
-                                        (attr[i].color[3] / 255).toString() +
-                                        ")"
-                                        );
+                if (attr !== "none") {
 
-                            }
+                    for (var i = 0; i < attr.length; i++) {
 
-                        }
 
-                        dom_element.style.textShadow = s.join(",");
+                        s.push(attr[i].x_off.toUsedLength(context.w, context.h) + "px " +
+                            attr[i].y_off.toUsedLength(context.w, context.h) + "px " +
+                            attr[i].b_radius.toUsedLength(context.w, context.h) + "px " +
+                            "rgba(" +
+                            attr[i].color[0].toString() + "," +
+                            attr[i].color[1].toString() + "," +
+                            attr[i].color[2].toString() + "," +
+                            (attr[i].color[3] / 255).toString() +
+                            ")"
+                        );
 
                     }
-                }
-        ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling textCombine",
-                function (context, dom_element, isd_element, attr) {
-
-                    dom_element.style.textCombineUpright = attr;
 
                 }
-        ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling textEmphasis",
-                function (context, dom_element, isd_element, attr) {
-
-                    /* applied as part of HTML document construction */
 
-                }
-        ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling unicodeBidi",
-                function (context, dom_element, isd_element, attr) {
+                dom_element.style.textShadow = s.join(",");
 
-                    var ub;
-
-                    if (attr === 'bidiOverride') {
-                        ub = "bidi-override";
-                    } else {
-                        ub = attr;
-                    }
+            }
+        }
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling textCombine",
+        function (context, dom_element, isd_element, attr) {
 
-                    dom_element.style.unicodeBidi = ub;
-                }
-        ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling visibility",
-                function (context, dom_element, isd_element, attr) {
-                    dom_element.style.visibility = attr;
-                }
-        ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling wrapOption",
-                function (context, dom_element, isd_element, attr) {
+            dom_element.style.textCombineUpright = attr;
 
-                    if (attr === "wrap") {
+        }
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling textEmphasis",
+        function (context, dom_element, isd_element, attr) {
 
-                        if (isd_element.space === "preserve") {
-                            dom_element.style.whiteSpace = "pre-wrap";
-                        } else {
-                            dom_element.style.whiteSpace = "normal";
-                        }
+            /* applied as part of HTML document construction */
 
-                    } else {
+        }
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling unicodeBidi",
+        function (context, dom_element, isd_element, attr) {
 
-                        if (isd_element.space === "preserve") {
+            var ub;
 
-                            dom_element.style.whiteSpace = "pre";
+            if (attr === 'bidiOverride') {
+                ub = "bidi-override";
+            } else {
+                ub = attr;
+            }
 
-                        } else {
-                            dom_element.style.whiteSpace = "noWrap";
-                        }
+            dom_element.style.unicodeBidi = ub;
+        }
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling visibility",
+        function (context, dom_element, isd_element, attr) {
+            dom_element.style.visibility = attr;
+        }
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling wrapOption",
+        function (context, dom_element, isd_element, attr) {
 
-                    }
+            if (attr === "wrap") {
 
+                if (isd_element.space === "preserve") {
+                    dom_element.style.whiteSpace = "pre-wrap";
+                } else {
+                    dom_element.style.whiteSpace = "normal";
                 }
-        ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling writingMode",
-                function (context, dom_element, isd_element, attr) {
 
-                    var wm;
+            } else {
 
-                    if (attr === "lrtb" || attr === "lr") {
+                if (isd_element.space === "preserve") {
 
-                        dom_element.style.writingMode = "horizontal-tb";
+                    dom_element.style.whiteSpace = "pre";
 
-                    } else if (attr === "rltb" || attr === "rl") {
+                } else {
+                    dom_element.style.whiteSpace = "noWrap";
+                }
 
-                        dom_element.style.writingMode = "horizontal-tb";
+            }
 
-                    } else if (attr === "tblr") {
+        }
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling writingMode",
+        function (context, dom_element, isd_element, attr) {
 
-                        dom_element.style.writingMode = "vertical-lr";
+            var wm;
 
-                    } else if (attr === "tbrl" || attr === "tb") {
+            if (attr === "lrtb" || attr === "lr") {
 
-                        dom_element.style.writingMode = "vertical-rl";
+                dom_element.style.writingMode = "horizontal-tb";
 
-                    }
+            } else if (attr === "rltb" || attr === "rl") {
 
-                }
-        ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml#styling zIndex",
-                function (context, dom_element, isd_element, attr) {
-                    dom_element.style.zIndex = attr;
-                }
-        ),
-        new HTMLStylingMapDefinition(
-                "http://www.w3.org/ns/ttml/profile/imsc1#styling forcedDisplay",
-                function (context, dom_element, isd_element, attr) {
+                dom_element.style.writingMode = "horizontal-tb";
 
-                    if (context.displayForcedOnlyMode && attr === false) {
-                        dom_element.style.visibility = "hidden";
-                    }
+            } else if (attr === "tblr") {
 
-                }
-        )
-    ];
+                dom_element.style.writingMode = "vertical-lr";
 
-    var STYLMAP_BY_QNAME = {};
+            } else if (attr === "tbrl" || attr === "tb") {
 
-    for (var i = 0; i < STYLING_MAP_DEFS.length; i++) {
+                dom_element.style.writingMode = "vertical-rl";
 
-        STYLMAP_BY_QNAME[STYLING_MAP_DEFS[i].qname] = STYLING_MAP_DEFS[i];
-    }
+            }
 
-    /* CSS property names */
+        }
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml#styling zIndex",
+        function (context, dom_element, isd_element, attr) {
+            dom_element.style.zIndex = attr;
+        }
+    ),
+    new HTMLStylingMapDefinition(
+        "http://www.w3.org/ns/ttml/profile/imsc1#styling forcedDisplay",
+        function (context, dom_element, isd_element, attr) {
 
-    var RUBYPOSITION_ISWK = "webkitRubyPosition" in window.getComputedStyle(document.documentElement);
+            if (context.displayForcedOnlyMode && attr === false) {
+                dom_element.style.visibility = "hidden";
+            }
 
-    var RUBYPOSITION_PROP = RUBYPOSITION_ISWK ? "webkitRubyPosition" : "rubyPosition";
+        }
+    )
+];
 
-    var TEXTEMPHASISSTYLE_PROP = "webkitTextEmphasisStyle" in window.getComputedStyle(document.documentElement) ? "webkitTextEmphasisStyle" : "textEmphasisStyle";
+var STYLMAP_BY_QNAME = {};
 
-    var TEXTEMPHASISPOSITION_PROP = "webkitTextEmphasisPosition" in window.getComputedStyle(document.documentElement) ? "webkitTextEmphasisPosition" : "textEmphasisPosition";
+for (var i = 0; i < STYLING_MAP_DEFS.length; i++) {
 
-    /* error utilities */
+    STYLMAP_BY_QNAME[STYLING_MAP_DEFS[i].qname] = STYLING_MAP_DEFS[i];
+}
 
-    function reportError(errorHandler, msg) {
+/* CSS property names */
 
-        if (errorHandler && errorHandler.error && errorHandler.error(msg))
-            throw msg;
+var RUBYPOSITION_ISWK = "webkitRubyPosition" in window.getComputedStyle(document.documentElement);
 
-    }
+var RUBYPOSITION_PROP = RUBYPOSITION_ISWK ? "webkitRubyPosition" : "rubyPosition";
+
+var TEXTEMPHASISSTYLE_PROP = "webkitTextEmphasisStyle" in window.getComputedStyle(document.documentElement) ? "webkitTextEmphasisStyle" : "textEmphasisStyle";
 
-})(typeof exports === 'undefined' ? this.imscHTML = {} : exports,
-        typeof imscNames === 'undefined' ? require("./names") : imscNames,
-        typeof imscStyles === 'undefined' ? require("./styles") : imscStyles,
-        typeof imscUtils === 'undefined' ? require("./utils") : imscUtils);
+var TEXTEMPHASISPOSITION_PROP = "webkitTextEmphasisPosition" in window.getComputedStyle(document.documentElement) ? "webkitTextEmphasisPosition" : "textEmphasisPosition";
diff --git a/src/main/js/isd.js b/src/main/js/isd.js
index f36ed954..b2b766e0 100644
--- a/src/main/js/isd.js
+++ b/src/main/js/isd.js
@@ -24,709 +24,709 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
+import { reportError } from './error.js';
+
 /**
  * @module imscISD
  */
 
+/** 
+ * Creates a canonical representation of an IMSC1 document returned by <pre>imscDoc.fromXML()</pre>
+ * at a given absolute offset in seconds. This offset does not have to be one of the values returned
+ * by <pre>getMediaTimeEvents()</pre>.
+ * 
+ * @param {Object} tt IMSC1 document
+ * @param {number} offset Absolute offset (in seconds)
+ * @param {?module:imscUtils.ErrorHandler} errorHandler Error callback
+ * @returns {Object} Opaque in-memory representation of an ISD
+ */
 
-;
-(function (imscISD, imscNames, imscStyles, imscUtils) { // wrapper for non-node envs
-
-    /** 
-     * Creates a canonical representation of an IMSC1 document returned by <pre>imscDoc.fromXML()</pre>
-     * at a given absolute offset in seconds. This offset does not have to be one of the values returned
-     * by <pre>getMediaTimeEvents()</pre>.
-     * 
-     * @param {Object} tt IMSC1 document
-     * @param {number} offset Absolute offset (in seconds)
-     * @param {?module:imscUtils.ErrorHandler} errorHandler Error callback
-     * @returns {Object} Opaque in-memory representation of an ISD
-     */
-
-    imscISD.generateISD = function (tt, offset, errorHandler) {
+export function generateISD(tt, offset, errorHandler) {
 
-        /* TODO check for tt and offset validity */
+    /* TODO check for tt and offset validity */
 
-        /* create the ISD object from the IMSC1 doc */
+    /* create the ISD object from the IMSC1 doc */
 
-        var isd = new ISD(tt);
+    var isd = new ISD(tt);
 
-        /* context */
+    /* context */
 
-        var context = {
+    var context = {
 
-            /*rubyfs: []*/ /* font size of the nearest textContainer or container */
+        /*rubyfs: []*/ /* font size of the nearest textContainer or container */
 
-        };
+    };
 
-        /* Filter body contents - Only process what we need within the offset and discard regions not applicable to the content */
-        var body = {};
-        var activeRegions = {};
-
-        /* gather any regions that might have showBackground="always" and show a background */
-        var initialShowBackground = tt.head.styling.initials[imscStyles.byName.showBackground.qname];
-        var initialbackgroundColor = tt.head.styling.initials[imscStyles.byName.backgroundColor.qname];
-        for (var layout_child in tt.head.layout.regions)
-        {
-            if (tt.head.layout.regions.hasOwnProperty(layout_child)) {
-                var region = tt.head.layout.regions[layout_child];
-                var showBackground = region.styleAttrs[imscStyles.byName.showBackground.qname] || initialShowBackground;
-                var backgroundColor = region.styleAttrs[imscStyles.byName.backgroundColor.qname] || initialbackgroundColor;
-                activeRegions[region.id] = (
-                    (showBackground === 'always' || showBackground === undefined) &&
-                    backgroundColor !== undefined &&
-                    !(offset < region.begin || offset >= region.end)
-                    );
-            }
+    /* Filter body contents - Only process what we need within the offset and discard regions not applicable to the content */
+    var body = {};
+    var activeRegions = {};
+
+    /* gather any regions that might have showBackground="always" and show a background */
+    var initialShowBackground = tt.head.styling.initials[imscStyles.byName.showBackground.qname];
+    var initialbackgroundColor = tt.head.styling.initials[imscStyles.byName.backgroundColor.qname];
+    for (var layout_child in tt.head.layout.regions) {
+        if (tt.head.layout.regions.hasOwnProperty(layout_child)) {
+            var region = tt.head.layout.regions[layout_child];
+            var showBackground = region.styleAttrs[imscStyles.byName.showBackground.qname] || initialShowBackground;
+            var backgroundColor = region.styleAttrs[imscStyles.byName.backgroundColor.qname] || initialbackgroundColor;
+            activeRegions[region.id] = (
+                (showBackground === 'always' || showBackground === undefined) &&
+                backgroundColor !== undefined &&
+                !(offset < region.begin || offset >= region.end)
+            );
         }
+    }
 
-        /* If the body specifies a region, catch it, since no filtered content will */
-        /* likely specify the region. */
-        if (tt.body && tt.body.regionID) {
-            activeRegions[tt.body.regionID] = true;
+    /* If the body specifies a region, catch it, since no filtered content will */
+    /* likely specify the region. */
+    if (tt.body && tt.body.regionID) {
+        activeRegions[tt.body.regionID] = true;
+    }
+
+    function filter(offset, element) {
+        function offsetFilter(element) {
+            return !(offset < element.begin || offset >= element.end);
         }
 
-        function filter(offset, element) {
-            function offsetFilter(element) {
-                return !(offset < element.begin || offset >= element.end);    
-            }    
-        
-            if (element.contents) {
-                var clone = {};
-                for (var prop in element) {
-                    if (element.hasOwnProperty(prop)) {
-                        clone[prop] = element[prop];
-                    }
+        if (element.contents) {
+            var clone = {};
+            for (var prop in element) {
+                if (element.hasOwnProperty(prop)) {
+                    clone[prop] = element[prop];
                 }
-                clone.contents = [];
-
-                element.contents.filter(offsetFilter).forEach(function (el) {
-                    var filteredElement = filter(offset, el);
-                    if (filteredElement.regionID) {
-                        activeRegions[filteredElement.regionID] = true;
-                    }
-        
-                    if (filteredElement !== null) {
-                        clone.contents.push(filteredElement);
-                    }
-                });
-                return clone;
-            } else {
-                return element;
             }
-        }
+            clone.contents = [];
 
-        if (tt.body !== null) {
-            body = filter(offset, tt.body);
+            element.contents.filter(offsetFilter).forEach(function (el) {
+                var filteredElement = filter(offset, el);
+                if (filteredElement.regionID) {
+                    activeRegions[filteredElement.regionID] = true;
+                }
+
+                if (filteredElement !== null) {
+                    clone.contents.push(filteredElement);
+                }
+            });
+            return clone;
         } else {
-            body = null;
+            return element;
         }
+    }
 
-        /* rewritten TTML will always have a default - this covers it. because the region is defaulted to "" */
-        if (activeRegions[""] !== undefined) {
-            activeRegions[""] = true;
-        }
+    if (tt.body !== null) {
+        body = filter(offset, tt.body);
+    } else {
+        body = null;
+    }
 
-        /* process regions */      
-        for (var regionID in activeRegions) {
-            if (activeRegions[regionID]) {
-                /* post-order traversal of the body tree per [construct intermediate document] */
+    /* rewritten TTML will always have a default - this covers it. because the region is defaulted to "" */
+    if (activeRegions[""] !== undefined) {
+        activeRegions[""] = true;
+    }
 
-                var c = isdProcessContentElement(tt, offset, tt.head.layout.regions[regionID], body, null, '', tt.head.layout.regions[regionID], errorHandler, context);
+    /* process regions */
+    for (var regionID in activeRegions) {
+        if (activeRegions[regionID]) {
+            /* post-order traversal of the body tree per [construct intermediate document] */
 
-                if (c !== null) {
+            var c = isdProcessContentElement(tt, offset, tt.head.layout.regions[regionID], body, null, '', tt.head.layout.regions[regionID], errorHandler, context);
 
-                    /* add the region to the ISD */
+            if (c !== null) {
 
-                    isd.contents.push(c.element);
-                }
+                /* add the region to the ISD */
+
+                isd.contents.push(c.element);
             }
         }
+    }
 
-        return isd;
-    };
+    return isd;
+};
 
-    /* set of styles not applicable to ruby container spans */
+/* set of styles not applicable to ruby container spans */
 
-    var _rcs_na_styles = [
-        imscStyles.byName.color.qname,
-        imscStyles.byName.textCombine.qname,
-        imscStyles.byName.textDecoration.qname,
-        imscStyles.byName.textEmphasis.qname,
-        imscStyles.byName.textOutline.qname,
-        imscStyles.byName.textShadow.qname
-    ];
+var _rcs_na_styles = [
+    imscStyles.byName.color.qname,
+    imscStyles.byName.textCombine.qname,
+    imscStyles.byName.textDecoration.qname,
+    imscStyles.byName.textEmphasis.qname,
+    imscStyles.byName.textOutline.qname,
+    imscStyles.byName.textShadow.qname
+];
 
-    function isdProcessContentElement(doc, offset, region, body, parent, inherited_region_id, elem, errorHandler, context) {
+function isdProcessContentElement(doc, offset, region, body, parent, inherited_region_id, elem, errorHandler, context) {
 
-        /* prune if temporally inactive */
+    /* prune if temporally inactive */
 
-        if (offset < elem.begin || offset >= elem.end) {
-            return null;
-        }
+    if (offset < elem.begin || offset >= elem.end) {
+        return null;
+    }
 
-        /* 
-         * set the associated region as specified by the regionID attribute, or the 
-         * inherited associated region otherwise
-         */
+    /* 
+     * set the associated region as specified by the regionID attribute, or the 
+     * inherited associated region otherwise
+     */
 
-        var associated_region_id = 'regionID' in elem && elem.regionID !== '' ? elem.regionID : inherited_region_id;
+    var associated_region_id = 'regionID' in elem && elem.regionID !== '' ? elem.regionID : inherited_region_id;
 
-        /* prune the element if either:
-         * - the element is not terminal and the associated region is neither the default
-         *   region nor the parent region (this allows children to be associated with a 
-         *   region later on)
-         * - the element is terminal and the associated region is not the parent region
-         */
+    /* prune the element if either:
+     * - the element is not terminal and the associated region is neither the default
+     *   region nor the parent region (this allows children to be associated with a 
+     *   region later on)
+     * - the element is terminal and the associated region is not the parent region
+     */
 
-        /* TODO: improve detection of terminal elements since <region> has no contents */
+    /* TODO: improve detection of terminal elements since <region> has no contents */
 
-        if (parent !== null /* are we in the region element */ &&
-            associated_region_id !== region.id &&
-            (
-                (!('contents' in elem)) ||
-                ('contents' in elem && elem.contents.length === 0) ||
-                associated_region_id !== ''
-                )
-            )
-            return null;
+    if (parent !== null /* are we in the region element */ &&
+        associated_region_id !== region.id &&
+        (
+            (!('contents' in elem)) ||
+            ('contents' in elem && elem.contents.length === 0) ||
+            associated_region_id !== ''
+        )
+    )
+        return null;
 
-        /* create an ISD element, including applying specified styles */
+    /* create an ISD element, including applying specified styles */
 
-        var isd_element = new ISDContentElement(elem);
+    var isd_element = new ISDContentElement(elem);
 
-        /* apply set (animation) styling */
+    /* apply set (animation) styling */
 
-        if ("sets" in elem) {
-            for (var i = 0; i < elem.sets.length; i++) {
+    if ("sets" in elem) {
+        for (var i = 0; i < elem.sets.length; i++) {
 
-                if (offset < elem.sets[i].begin || offset >= elem.sets[i].end)
-                    continue;
+            if (offset < elem.sets[i].begin || offset >= elem.sets[i].end)
+                continue;
 
-                isd_element.styleAttrs[elem.sets[i].qname] = elem.sets[i].value;
+            isd_element.styleAttrs[elem.sets[i].qname] = elem.sets[i].value;
 
-            }
         }
+    }
 
-        /* 
-         * keep track of specified styling attributes so that we
-         * can compute them later
-         */
-
-        var spec_attr = {};
+    /* 
+     * keep track of specified styling attributes so that we
+     * can compute them later
+     */
 
-        for (var qname in isd_element.styleAttrs) {
+    var spec_attr = {};
 
-            if (! isd_element.styleAttrs.hasOwnProperty(qname)) continue;
+    for (var qname in isd_element.styleAttrs) {
 
-            spec_attr[qname] = true;
+        if (!isd_element.styleAttrs.hasOwnProperty(qname)) continue;
 
-            /* special rule for tts:writingMode (section 7.29.1 of XSL)
-             * direction is set consistently with writingMode only
-             * if writingMode sets inline-direction to LTR or RTL  
-             */
+        spec_attr[qname] = true;
 
-            if (isd_element.kind === 'region' &&
-                qname === imscStyles.byName.writingMode.qname &&
-                !(imscStyles.byName.direction.qname in isd_element.styleAttrs)) {
+        /* special rule for tts:writingMode (section 7.29.1 of XSL)
+         * direction is set consistently with writingMode only
+         * if writingMode sets inline-direction to LTR or RTL  
+         */
 
-                var wm = isd_element.styleAttrs[qname];
+        if (isd_element.kind === 'region' &&
+            qname === imscStyles.byName.writingMode.qname &&
+            !(imscStyles.byName.direction.qname in isd_element.styleAttrs)) {
 
-                if (wm === "lrtb" || wm === "lr") {
+            var wm = isd_element.styleAttrs[qname];
 
-                    isd_element.styleAttrs[imscStyles.byName.direction.qname] = "ltr";
+            if (wm === "lrtb" || wm === "lr") {
 
-                } else if (wm === "rltb" || wm === "rl") {
+                isd_element.styleAttrs[imscStyles.byName.direction.qname] = "ltr";
 
-                    isd_element.styleAttrs[imscStyles.byName.direction.qname] = "rtl";
+            } else if (wm === "rltb" || wm === "rl") {
 
-                }
+                isd_element.styleAttrs[imscStyles.byName.direction.qname] = "rtl";
 
             }
+
         }
+    }
 
-        /* inherited styling */
+    /* inherited styling */
 
-        if (parent !== null) {
+    if (parent !== null) {
 
-            for (var j = 0; j < imscStyles.all.length; j++) {
+        for (var j = 0; j < imscStyles.all.length; j++) {
 
-                var sa = imscStyles.all[j];
+            var sa = imscStyles.all[j];
 
-                /* textDecoration has special inheritance rules */
+            /* textDecoration has special inheritance rules */
 
-                if (sa.qname === imscStyles.byName.textDecoration.qname) {
+            if (sa.qname === imscStyles.byName.textDecoration.qname) {
 
-                    /* handle both textDecoration inheritance and specification */
+                /* handle both textDecoration inheritance and specification */
 
-                    var ps = parent.styleAttrs[sa.qname];
-                    var es = isd_element.styleAttrs[sa.qname];
-                    var outs = [];
+                var ps = parent.styleAttrs[sa.qname];
+                var es = isd_element.styleAttrs[sa.qname];
+                var outs = [];
 
-                    if (es === undefined) {
+                if (es === undefined) {
 
-                        outs = ps;
+                    outs = ps;
 
-                    } else if (es.indexOf("none") === -1) {
+                } else if (es.indexOf("none") === -1) {
 
-                        if ((es.indexOf("noUnderline") === -1 &&
-                            ps.indexOf("underline") !== -1) ||
-                            es.indexOf("underline") !== -1) {
+                    if ((es.indexOf("noUnderline") === -1 &&
+                        ps.indexOf("underline") !== -1) ||
+                        es.indexOf("underline") !== -1) {
 
-                            outs.push("underline");
+                        outs.push("underline");
 
-                        }
+                    }
 
-                        if ((es.indexOf("noLineThrough") === -1 &&
-                            ps.indexOf("lineThrough") !== -1) ||
-                            es.indexOf("lineThrough") !== -1) {
+                    if ((es.indexOf("noLineThrough") === -1 &&
+                        ps.indexOf("lineThrough") !== -1) ||
+                        es.indexOf("lineThrough") !== -1) {
 
-                            outs.push("lineThrough");
+                        outs.push("lineThrough");
 
-                        }
+                    }
 
-                        if ((es.indexOf("noOverline") === -1 &&
-                            ps.indexOf("overline") !== -1) ||
-                            es.indexOf("overline") !== -1) {
+                    if ((es.indexOf("noOverline") === -1 &&
+                        ps.indexOf("overline") !== -1) ||
+                        es.indexOf("overline") !== -1) {
 
-                            outs.push("overline");
+                        outs.push("overline");
 
-                        }
+                    }
 
-                    } else {
+                } else {
 
-                        outs.push("none");
+                    outs.push("none");
 
-                    }
+                }
 
-                    isd_element.styleAttrs[sa.qname] = outs;
+                isd_element.styleAttrs[sa.qname] = outs;
 
-                } else if (sa.qname === imscStyles.byName.fontSize.qname &&
-                    !(sa.qname in isd_element.styleAttrs) &&
-                    isd_element.kind === 'span' &&
-                    isd_element.styleAttrs[imscStyles.byName.ruby.qname] === "textContainer") {
-                    
-                    /* special inheritance rule for ruby text container font size */
-                    
-                    var ruby_fs = parent.styleAttrs[imscStyles.byName.fontSize.qname];
+            } else if (sa.qname === imscStyles.byName.fontSize.qname &&
+                !(sa.qname in isd_element.styleAttrs) &&
+                isd_element.kind === 'span' &&
+                isd_element.styleAttrs[imscStyles.byName.ruby.qname] === "textContainer") {
 
-                    isd_element.styleAttrs[sa.qname] = new imscUtils.ComputedLength(
-                        0.5 * ruby_fs.rw,
-                        0.5 * ruby_fs.rh);
-
-                } else if (sa.qname === imscStyles.byName.fontSize.qname &&
-                    !(sa.qname in isd_element.styleAttrs) &&
-                    isd_element.kind === 'span' &&
-                    isd_element.styleAttrs[imscStyles.byName.ruby.qname] === "text") {
-                    
-                    /* special inheritance rule for ruby text font size */
-                    
-                    var parent_fs = parent.styleAttrs[imscStyles.byName.fontSize.qname];
-                    
-                    if (parent.styleAttrs[imscStyles.byName.ruby.qname] === "textContainer") {
-                        
-                        isd_element.styleAttrs[sa.qname] = parent_fs;
-                        
-                    } else {
-                        
-                        isd_element.styleAttrs[sa.qname] = new imscUtils.ComputedLength(
-                            0.5 * parent_fs.rw,
-                            0.5 * parent_fs.rh);
-                    }
-                    
-                } else if (sa.inherit &&
-                    (sa.qname in parent.styleAttrs) &&
-                    !(sa.qname in isd_element.styleAttrs)) {
+                /* special inheritance rule for ruby text container font size */
+
+                var ruby_fs = parent.styleAttrs[imscStyles.byName.fontSize.qname];
+
+                isd_element.styleAttrs[sa.qname] = new imscUtils.ComputedLength(
+                    0.5 * ruby_fs.rw,
+                    0.5 * ruby_fs.rh);
+
+            } else if (sa.qname === imscStyles.byName.fontSize.qname &&
+                !(sa.qname in isd_element.styleAttrs) &&
+                isd_element.kind === 'span' &&
+                isd_element.styleAttrs[imscStyles.byName.ruby.qname] === "text") {
+
+                /* special inheritance rule for ruby text font size */
+
+                var parent_fs = parent.styleAttrs[imscStyles.byName.fontSize.qname];
 
-                    isd_element.styleAttrs[sa.qname] = parent.styleAttrs[sa.qname];
+                if (parent.styleAttrs[imscStyles.byName.ruby.qname] === "textContainer") {
 
+                    isd_element.styleAttrs[sa.qname] = parent_fs;
+
+                } else {
+
+                    isd_element.styleAttrs[sa.qname] = new imscUtils.ComputedLength(
+                        0.5 * parent_fs.rw,
+                        0.5 * parent_fs.rh);
                 }
 
+            } else if (sa.inherit &&
+                (sa.qname in parent.styleAttrs) &&
+                !(sa.qname in isd_element.styleAttrs)) {
+
+                isd_element.styleAttrs[sa.qname] = parent.styleAttrs[sa.qname];
+
             }
 
         }
 
-        /* initial value styling */
+    }
 
-        for (var k = 0; k < imscStyles.all.length; k++) {
-            
-            var ivs = imscStyles.all[k];
+    /* initial value styling */
 
-            /* skip if value is already specified */
+    for (var k = 0; k < imscStyles.all.length; k++) {
 
-            if (ivs.qname in isd_element.styleAttrs) continue;
+        var ivs = imscStyles.all[k];
 
-            /* skip tts:position if tts:origin is specified */
+        /* skip if value is already specified */
 
-            if (ivs.qname === imscStyles.byName.position.qname &&
-                imscStyles.byName.origin.qname in isd_element.styleAttrs)
-                continue;
+        if (ivs.qname in isd_element.styleAttrs) continue;
 
-            /* skip tts:origin if tts:position is specified */
+        /* skip tts:position if tts:origin is specified */
 
-            if (ivs.qname === imscStyles.byName.origin.qname &&
-                imscStyles.byName.position.qname in isd_element.styleAttrs)
-                continue;
-            
-            /* determine initial value */
-            
-            var iv = doc.head.styling.initials[ivs.qname] || ivs.initial;
+        if (ivs.qname === imscStyles.byName.position.qname &&
+            imscStyles.byName.origin.qname in isd_element.styleAttrs)
+            continue;
 
-            if (iv === null) {
-                /* skip processing if no initial value defined */
+        /* skip tts:origin if tts:position is specified */
 
-                continue;
-            }
+        if (ivs.qname === imscStyles.byName.origin.qname &&
+            imscStyles.byName.position.qname in isd_element.styleAttrs)
+            continue;
 
-            /* apply initial value to elements other than region only if non-inherited */
+        /* determine initial value */
 
-            if (isd_element.kind === 'region' || (ivs.inherit === false && iv !== null)) {
+        var iv = doc.head.styling.initials[ivs.qname] || ivs.initial;
 
-                var piv = ivs.parse(iv);
+        if (iv === null) {
+            /* skip processing if no initial value defined */
 
-                if (piv !== null) {
+            continue;
+        }
 
-                    isd_element.styleAttrs[ivs.qname] = piv;
+        /* apply initial value to elements other than region only if non-inherited */
 
-                    /* keep track of the style as specified */
+        if (isd_element.kind === 'region' || (ivs.inherit === false && iv !== null)) {
 
-                    spec_attr[ivs.qname] = true;
+            var piv = ivs.parse(iv);
 
-                } else {
+            if (piv !== null) {
 
-                    reportError(errorHandler, "Invalid initial value for '" + ivs.qname + "' on element '" + isd_element.kind);
+                isd_element.styleAttrs[ivs.qname] = piv;
 
-                }
+                /* keep track of the style as specified */
+
+                spec_attr[ivs.qname] = true;
+
+            } else {
+
+                reportError(errorHandler, "Invalid initial value for '" + ivs.qname + "' on element '" + isd_element.kind);
 
             }
 
         }
 
-        /* compute styles (only for non-inherited styles) */
-        /* TODO: get rid of spec_attr */
+    }
+
+    /* compute styles (only for non-inherited styles) */
+    /* TODO: get rid of spec_attr */
+
+    for (var z = 0; z < imscStyles.all.length; z++) {
+
+        var cs = imscStyles.all[z];
 
-        for (var z = 0; z < imscStyles.all.length; z++) {
-            
-            var cs = imscStyles.all[z];
+        if (!(cs.qname in spec_attr)) continue;
 
-            if (!(cs.qname in spec_attr)) continue;
+        if (cs.compute !== null) {
 
-            if (cs.compute !== null) {
+            var cstyle = cs.compute(
+                /*doc, parent, element, attr, context*/
+                doc,
+                parent,
+                isd_element,
+                isd_element.styleAttrs[cs.qname],
+                context
+            );
 
-                var cstyle = cs.compute(
+            if (cstyle !== null) {
+
+                isd_element.styleAttrs[cs.qname] = cstyle;
+
+            } else {
+                /* if the style cannot be computed, replace it by its initial value */
+
+                isd_element.styleAttrs[cs.qname] = cs.compute(
                     /*doc, parent, element, attr, context*/
                     doc,
                     parent,
                     isd_element,
-                    isd_element.styleAttrs[cs.qname],
+                    cs.parse(cs.initial),
                     context
-                    );
-
-                if (cstyle !== null) {
+                );
 
-                    isd_element.styleAttrs[cs.qname] = cstyle;
-                    
-                } else {
-                    /* if the style cannot be computed, replace it by its initial value */
-
-                    isd_element.styleAttrs[cs.qname] = cs.compute(
-                        /*doc, parent, element, attr, context*/
-                        doc,
-                        parent,
-                        isd_element,
-                        cs.parse(cs.initial),
-                        context
-                    );
-
-                    reportError(errorHandler, "Style '" + cs.qname + "' on element '" + isd_element.kind + "' cannot be computed");
-                }
+                reportError(errorHandler, "Style '" + cs.qname + "' on element '" + isd_element.kind + "' cannot be computed");
             }
-
         }
 
-        /* prune if tts:display is none */
+    }
 
-        if (isd_element.styleAttrs[imscStyles.byName.display.qname] === "none")
-            return null;
+    /* prune if tts:display is none */
 
-        /* process contents of the element */
+    if (isd_element.styleAttrs[imscStyles.byName.display.qname] === "none")
+        return null;
 
-        var contents = null;
+    /* process contents of the element */
 
-        if (parent === null) {
+    var contents = null;
 
-            /* we are processing the region */
+    if (parent === null) {
 
-            if (body === null) {
+        /* we are processing the region */
 
-                /* if there is no body, still process the region but with empty content */
+        if (body === null) {
 
-                contents = [];
+            /* if there is no body, still process the region but with empty content */
 
-            } else {
+            contents = [];
 
-                /*use the body element as contents */
+        } else {
 
-                contents = [body];
+            /*use the body element as contents */
 
-            }
+            contents = [body];
 
-        } else if ('contents' in elem) {
+        }
 
-            contents = elem.contents;
+    } else if ('contents' in elem) {
 
-        }
+        contents = elem.contents;
 
-        for (var x = 0; contents !== null && x < contents.length; x++) {
+    }
 
-            var c = isdProcessContentElement(doc, offset, region, body, isd_element, associated_region_id, contents[x], errorHandler, context);
+    for (var x = 0; contents !== null && x < contents.length; x++) {
 
-            /* 
-             * keep child element only if they are non-null and their region match 
-             * the region of this element
-             */
+        var c = isdProcessContentElement(doc, offset, region, body, isd_element, associated_region_id, contents[x], errorHandler, context);
 
-            if (c !== null) {
+        /* 
+         * keep child element only if they are non-null and their region match 
+         * the region of this element
+         */
 
-                isd_element.contents.push(c.element);
+        if (c !== null) {
 
-            }
+            isd_element.contents.push(c.element);
 
         }
 
-        /* remove styles that are not applicable */
+    }
 
-        for (var qnameb in isd_element.styleAttrs) {
-            if (!isd_element.styleAttrs.hasOwnProperty(qnameb)) continue;
+    /* remove styles that are not applicable */
 
-            /* true if not applicable */
+    for (var qnameb in isd_element.styleAttrs) {
+        if (!isd_element.styleAttrs.hasOwnProperty(qnameb)) continue;
 
-            var na = false;
+        /* true if not applicable */
 
-            /* special applicability of certain style properties to ruby container spans */
-            /* TODO: in the future ruby elements should be translated to elements instead of kept as spans */
+        var na = false;
 
-            if (isd_element.kind === 'span') {
+        /* special applicability of certain style properties to ruby container spans */
+        /* TODO: in the future ruby elements should be translated to elements instead of kept as spans */
 
-                var rsp = isd_element.styleAttrs[imscStyles.byName.ruby.qname];
+        if (isd_element.kind === 'span') {
 
-                na = ( rsp === 'container' || rsp === 'textContainer' || rsp === 'baseContainer' ) && 
-                    _rcs_na_styles.indexOf(qnameb) !== -1;
+            var rsp = isd_element.styleAttrs[imscStyles.byName.ruby.qname];
 
-                if (! na) {
+            na = (rsp === 'container' || rsp === 'textContainer' || rsp === 'baseContainer') &&
+                _rcs_na_styles.indexOf(qnameb) !== -1;
 
-                    na = rsp !== 'container' &&
-                        qnameb === imscStyles.byName.rubyAlign.qname;
+            if (!na) {
 
-                }
+                na = rsp !== 'container' &&
+                    qnameb === imscStyles.byName.rubyAlign.qname;
 
-                if (! na) {
+            }
 
-                    na =  (! (rsp === 'textContainer' || rsp === 'text')) &&
-                        qnameb === imscStyles.byName.rubyPosition.qname;
+            if (!na) {
 
-                }
+                na = (!(rsp === 'textContainer' || rsp === 'text')) &&
+                    qnameb === imscStyles.byName.rubyPosition.qname;
 
             }
 
-            /* normal applicability */
-            
-            if (! na) {
+        }
 
-                var da = imscStyles.byQName[qnameb];
+        /* normal applicability */
 
-                if ("applies" in da){
+        if (!na) {
 
-                    na = da.applies.indexOf(isd_element.kind) === -1;
+            var da = imscStyles.byQName[qnameb];
 
-                }
+            if ("applies" in da) {
+
+                na = da.applies.indexOf(isd_element.kind) === -1;
 
             }
 
+        }
 
-            if (na) {
-                delete isd_element.styleAttrs[qnameb];
-            }
 
+        if (na) {
+            delete isd_element.styleAttrs[qnameb];
         }
 
-        /* trim whitespace around explicit line breaks */
+    }
 
-        var ruby = isd_element.styleAttrs[imscStyles.byName.ruby.qname];
+    /* trim whitespace around explicit line breaks */
 
-        if (isd_element.kind === 'p' ||
-            (isd_element.kind === 'span' && (ruby === "textContainer" || ruby === "text"))
-            ) {
+    var ruby = isd_element.styleAttrs[imscStyles.byName.ruby.qname];
 
-            var elist = [];
+    if (isd_element.kind === 'p' ||
+        (isd_element.kind === 'span' && (ruby === "textContainer" || ruby === "text"))
+    ) {
 
-            constructSpanList(isd_element, elist);
+        var elist = [];
 
-            collapseLWSP(elist);
+        constructSpanList(isd_element, elist);
 
-            pruneEmptySpans(isd_element);
+        collapseLWSP(elist);
 
-        }
+        pruneEmptySpans(isd_element);
 
-        /* keep element if:
-         * * contains a background image
-         * * <br/>
-         * * if there are children
-         * * if it is an image
-         * * if <span> and has text
-         * * if region and showBackground = always
-         */
+    }
 
-        if ((isd_element.kind === 'div' && imscStyles.byName.backgroundImage.qname in isd_element.styleAttrs) ||
-            isd_element.kind === 'br' ||
-            isd_element.kind === 'image' ||
-            ('contents' in isd_element && isd_element.contents.length > 0) ||
-            (isd_element.kind === 'span' && isd_element.text !== null) ||
-            (isd_element.kind === 'region' &&
-                isd_element.styleAttrs[imscStyles.byName.showBackground.qname] === 'always')) {
-
-            return {
-                region_id: associated_region_id,
-                element: isd_element
-            };
-        }
+    /* keep element if:
+     * * contains a background image
+     * * <br/>
+     * * if there are children
+     * * if it is an image
+     * * if <span> and has text
+     * * if region and showBackground = always
+     */
 
-        return null;
+    if ((isd_element.kind === 'div' && imscStyles.byName.backgroundImage.qname in isd_element.styleAttrs) ||
+        isd_element.kind === 'br' ||
+        isd_element.kind === 'image' ||
+        ('contents' in isd_element && isd_element.contents.length > 0) ||
+        (isd_element.kind === 'span' && isd_element.text !== null) ||
+        (isd_element.kind === 'region' &&
+            isd_element.styleAttrs[imscStyles.byName.showBackground.qname] === 'always')) {
+
+        return {
+            region_id: associated_region_id,
+            element: isd_element
+        };
     }
 
-    function collapseLWSP(elist) {
+    return null;
+}
 
-        function isPrevCharLWSP(prev_element) {
-            return prev_element.kind === 'br' || /[\r\n\t ]$/.test(prev_element.text);
-        }
+function collapseLWSP(elist) {
 
-        function isNextCharLWSP(next_element) {
-            return next_element.kind === 'br' || (next_element.space === "preserve" && /^[\r\n]/.test(next_element.text));
-        }
+    function isPrevCharLWSP(prev_element) {
+        return prev_element.kind === 'br' || /[\r\n\t ]$/.test(prev_element.text);
+    }
 
-        /* collapse spaces and remove leading LWSPs */
+    function isNextCharLWSP(next_element) {
+        return next_element.kind === 'br' || (next_element.space === "preserve" && /^[\r\n]/.test(next_element.text));
+    }
 
-        var element;
+    /* collapse spaces and remove leading LWSPs */
 
-        for (var i = 0; i < elist.length;) {
+    var element;
 
-            element = elist[i];
+    for (var i = 0; i < elist.length;) {
 
-            if (element.kind === "br" || element.space === "preserve") {
-                i++;
-                continue;
-            }
+        element = elist[i];
 
-            var trimmed_text = element.text.replace(/[\t\r\n ]+/g, ' ');
+        if (element.kind === "br" || element.space === "preserve") {
+            i++;
+            continue;
+        }
 
-            if (/^[ ]/.test(trimmed_text)) {
+        var trimmed_text = element.text.replace(/[\t\r\n ]+/g, ' ');
 
-                if (i === 0 || isPrevCharLWSP(elist[i - 1])) {
-                    trimmed_text = trimmed_text.substring(1);
-                }
+        if (/^[ ]/.test(trimmed_text)) {
 
+            if (i === 0 || isPrevCharLWSP(elist[i - 1])) {
+                trimmed_text = trimmed_text.substring(1);
             }
 
-            element.text = trimmed_text;
+        }
 
-            if (trimmed_text.length === 0) {
-                elist.splice(i, 1);
-            } else {
-                i++;
-            }
+        element.text = trimmed_text;
 
+        if (trimmed_text.length === 0) {
+            elist.splice(i, 1);
+        } else {
+            i++;
         }
 
-        /* remove trailing LWSPs */
+    }
 
-        for (i = 0; i < elist.length; i++) {
+    /* remove trailing LWSPs */
 
-            element = elist[i];
+    for (i = 0; i < elist.length; i++) {
 
-            if (element.kind === "br" || element.space === "preserve") {
-                i++;
-                continue;
-            }
+        element = elist[i];
 
-            if (/[ ]$/.test(element.text)) {
+        if (element.kind === "br" || element.space === "preserve") {
+            i++;
+            continue;
+        }
 
-                if (i === (elist.length - 1) || isNextCharLWSP(elist[i + 1])) {
-                    element.text = element.text.slice(0, -1);
-                }
+        if (/[ ]$/.test(element.text)) {
 
+            if (i === (elist.length - 1) || isNextCharLWSP(elist[i + 1])) {
+                element.text = element.text.slice(0, -1);
             }
 
         }
 
     }
 
-    function constructSpanList(element, elist) {
+}
 
-        if (! ("contents" in element)) {
-            return;
-        }
+function constructSpanList(element, elist) {
 
-        for (var i = 0; i < element.contents.length; i++) {
+    if (!("contents" in element)) {
+        return;
+    }
 
-            var child = element.contents[i];
-            var ruby = child.styleAttrs[imscStyles.byName.ruby.qname];
+    for (var i = 0; i < element.contents.length; i++) {
 
-            if (child.kind === 'span' && (ruby === "textContainer" || ruby === "text")) {
+        var child = element.contents[i];
+        var ruby = child.styleAttrs[imscStyles.byName.ruby.qname];
 
-                /* skip ruby text and text containers, which are handled on their own */
-            
-                continue;
+        if (child.kind === 'span' && (ruby === "textContainer" || ruby === "text")) {
 
-            } else if ('contents' in child) {
-    
-                constructSpanList(child, elist);
-    
-            } else if ((child.kind === 'span' && child.text.length !== 0) || child.kind === 'br') {
+            /* skip ruby text and text containers, which are handled on their own */
 
-                /* skip empty spans */
+            continue;
 
-                elist.push(child);
+        } else if ('contents' in child) {
 
-            }
+            constructSpanList(child, elist);
+
+        } else if ((child.kind === 'span' && child.text.length !== 0) || child.kind === 'br') {
+
+            /* skip empty spans */
+
+            elist.push(child);
 
         }
 
     }
 
-    function pruneEmptySpans(element) {
+}
 
-        if (element.kind === 'br') {
+function pruneEmptySpans(element) {
 
-            return false;
+    if (element.kind === 'br') {
 
-        } else if ('text' in element) {
+        return false;
 
-            return  element.text.length === 0;
+    } else if ('text' in element) {
 
-        } else if ('contents' in element) {
+        return element.text.length === 0;
 
-            var i = element.contents.length;
+    } else if ('contents' in element) {
 
-            while (i--) {
+        var i = element.contents.length;
 
-                if (pruneEmptySpans(element.contents[i])) {
-                    element.contents.splice(i, 1);
-                }
+        while (i--) {
 
+            if (pruneEmptySpans(element.contents[i])) {
+                element.contents.splice(i, 1);
             }
 
-            return element.contents.length === 0;
-
         }
+
+        return element.contents.length === 0;
+
     }
+}
 
-    function ISD(tt) {
+class ISD {
+    constructor(tt) {
         this.contents = [];
         this.aspectRatio = tt.aspectRatio;
         this.lang = tt.lang;
     }
+}
 
-    function ISDContentElement(ttelem) {
+class ISDContentElement {
+    constructor(ttelem) {
 
         /* assume the element is a region if it does not have a kind */
 
@@ -747,24 +747,24 @@
 
         for (var sname in ttelem.styleAttrs) {
 
-            if (! ttelem.styleAttrs.hasOwnProperty(sname)) continue;
+            if (!ttelem.styleAttrs.hasOwnProperty(sname)) continue;
 
             this.styleAttrs[sname] =
                 ttelem.styleAttrs[sname];
         }
-        
+
         /* copy src and type if image */
-        
+
         if ('src' in ttelem) {
-            
+
             this.src = ttelem.src;
-            
+
         }
-        
-         if ('type' in ttelem) {
-            
+
+        if ('type' in ttelem) {
+
             this.type = ttelem.type;
-            
+
         }
 
         /* TODO: clean this! 
@@ -784,46 +784,4 @@
             this.space = ttelem.space;
         }
     }
-
-
-    /*
-     * ERROR HANDLING UTILITY FUNCTIONS
-     * 
-     */
-
-    function reportInfo(errorHandler, msg) {
-
-        if (errorHandler && errorHandler.info && errorHandler.info(msg))
-            throw msg;
-
-    }
-
-    function reportWarning(errorHandler, msg) {
-
-        if (errorHandler && errorHandler.warn && errorHandler.warn(msg))
-            throw msg;
-
-    }
-
-    function reportError(errorHandler, msg) {
-
-        if (errorHandler && errorHandler.error && errorHandler.error(msg))
-            throw msg;
-
-    }
-
-    function reportFatal(errorHandler, msg) {
-
-        if (errorHandler && errorHandler.fatal)
-            errorHandler.fatal(msg);
-
-        throw msg;
-
-    }
-
-
-})(typeof exports === 'undefined' ? this.imscISD = {} : exports,
-    typeof imscNames === 'undefined' ? require("./names") : imscNames,
-    typeof imscStyles === 'undefined' ? require("./styles") : imscStyles,
-    typeof imscUtils === 'undefined' ? require("./utils") : imscUtils
-    );
+}
diff --git a/src/main/js/main.js b/src/main/js/main.js
index 14d07be9..b7f2c0f1 100644
--- a/src/main/js/main.js
+++ b/src/main/js/main.js
@@ -24,6 +24,6 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-exports.generateISD = require('./isd').generateISD;
-exports.fromXML = require('./doc').fromXML;
-exports.renderHTML = require('./html').render;
\ No newline at end of file
+export { fromXML } from './doc.js';
+export { renderHTML } from "./html.js";
+export { generateISD } from './isd.js';
diff --git a/src/main/js/names.js b/src/main/js/names.js
index 9bab50a7..e68c492a 100644
--- a/src/main/js/names.js
+++ b/src/main/js/names.js
@@ -28,20 +28,11 @@
  * @module imscNames
  */
 
-;
-(function (imscNames) { // wrapper for non-node envs
-
-    imscNames.ns_tt = "http://www.w3.org/ns/ttml";
-    imscNames.ns_tts = "http://www.w3.org/ns/ttml#styling";
-    imscNames.ns_ttp = "http://www.w3.org/ns/ttml#parameter";
-    imscNames.ns_xml = "http://www.w3.org/XML/1998/namespace";
-    imscNames.ns_itts = "http://www.w3.org/ns/ttml/profile/imsc1#styling";
-    imscNames.ns_ittp = "http://www.w3.org/ns/ttml/profile/imsc1#parameter";
-    imscNames.ns_smpte = "http://www.smpte-ra.org/schemas/2052-1/2010/smpte-tt";
-    imscNames.ns_ebutts = "urn:ebu:tt:style";
-    
-})(typeof exports === 'undefined' ? this.imscNames = {} : exports);
-
-
-
-
+export const ns_tt = "http://www.w3.org/ns/ttml";
+export const ns_tts = "http://www.w3.org/ns/ttml#styling";
+export const ns_ttp = "http://www.w3.org/ns/ttml#parameter";
+export const ns_xml = "http://www.w3.org/XML/1998/namespace";
+export const ns_itts = "http://www.w3.org/ns/ttml/profile/imsc1#styling";
+export const ns_ittp = "http://www.w3.org/ns/ttml/profile/imsc1#parameter";
+export const ns_smpte = "http://www.smpte-ra.org/schemas/2052-1/2010/smpte-tt";
+export const ns_ebutts = "urn:ebu:tt:style";
diff --git a/src/main/js/styles.js b/src/main/js/styles.js
index 2d96c757..6de1a660 100644
--- a/src/main/js/styles.js
+++ b/src/main/js/styles.js
@@ -24,14 +24,15 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
+import { ns_ebutts, ns_itts, ns_smpte, ns_tts } from './names.js';
+import { ComputedLength, parseColor, parseFloat, parseInt, parseLength, parsePosition, parseTextShadow, toComputedLength } from './utils.js';
+
 /**
  * @module imscStyles
  */
 
-;
-(function (imscStyles, imscNames, imscUtils) { // wrapper for non-node envs
-
-    function StylingAttributeDefinition(ns, name, initialValue, appliesTo, isInherit, isAnimatable, parseFunc, computeFunc) {
+class StylingAttributeDefinition {
+    constructor(ns, name, initialValue, appliesTo, isInherit, isAnimatable, parseFunc, computeFunc) {
         this.name = name;
         this.ns = ns;
         this.qname = ns + " " + name;
@@ -42,172 +43,167 @@
         this.parse = parseFunc;
         this.compute = computeFunc;
     }
+}
+
+export const all = [
+
+    new StylingAttributeDefinition(
+        ns_tts,
+        "backgroundColor",
+        "transparent",
+        ['body', 'div', 'p', 'region', 'span'],
+        false,
+        true,
+        parseColor,
+        null
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "color",
+        "white",
+        ['span'],
+        true,
+        true,
+        parseColor,
+        null
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "direction",
+        "ltr",
+        ['p', 'span'],
+        true,
+        true,
+        function (str) {
+            return str;
+        },
+        null
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "display",
+        "auto",
+        ['body', 'div', 'p', 'region', 'span'],
+        false,
+        true,
+        function (str) {
+            return str;
+        },
+        null
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "displayAlign",
+        "before",
+        ['region'],
+        false,
+        true,
+        function (str) {
+            return str;
+        },
+        null
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "extent",
+        "auto",
+        ['tt', 'region'],
+        false,
+        true,
+        function (str) {
+
+            if (str === "auto") {
 
-    imscStyles.all = [
-
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "backgroundColor",
-            "transparent",
-            ['body', 'div', 'p', 'region', 'span'],
-            false,
-            true,
-            imscUtils.parseColor,
-            null
-            ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "color",
-            "white",
-            ['span'],
-            true,
-            true,
-            imscUtils.parseColor,
-            null
-            ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "direction",
-            "ltr",
-            ['p', 'span'],
-            true,
-            true,
-            function (str) {
-                return str;
-            },
-            null
-            ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "display",
-            "auto",
-            ['body', 'div', 'p', 'region', 'span'],
-            false,
-            true,
-            function (str) {
-                return str;
-            },
-            null
-            ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "displayAlign",
-            "before",
-            ['region'],
-            false,
-            true,
-            function (str) {
                 return str;
-            },
-            null
-            ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "extent",
-            "auto",
-            ['tt', 'region'],
-            false,
-            true,
-            function (str) {
-
-                if (str === "auto") {
-
-                    return str;
 
-                } else {
+            } else {
 
-                    var s = str.split(" ");
-                    if (s.length !== 2)
-                        return null;
-                    var w = imscUtils.parseLength(s[0]);
-                    var h = imscUtils.parseLength(s[1]);
-                    if (!h || !w)
-                        return null;
-                    return {'h': h, 'w': w};
-                }
+                var s = str.split(" ");
+                if (s.length !== 2)
+                    return null;
+                var w = parseLength(s[0]);
+                var h = parseLength(s[1]);
+                if (!h || !w)
+                    return null;
+                return { 'h': h, 'w': w };
+            }
 
-            },
-            function (doc, parent, element, attr, context) {
+        },
+        function (doc, parent, element, attr, context) {
 
-                var h;
-                var w;
+            var h;
+            var w;
 
-                if (attr === "auto") {
+            if (attr === "auto") {
 
-                    h = new imscUtils.ComputedLength(0, 1);
+                h = new ComputedLength(0, 1);
 
-                } else {
+            } else {
 
-                    h = imscUtils.toComputedLength(
-                        attr.h.value,
-                        attr.h.unit,
-                        null,
-                        doc.dimensions.h,
-                        null,
-                        doc.pxLength.h
-                        );
+                h = toComputedLength(
+                    attr.h.value,
+                    attr.h.unit,
+                    null,
+                    doc.dimensions.h,
+                    null,
+                    doc.pxLength.h
+                );
 
 
-                    if (h === null) {
+                if (h === null) {
 
-                        return null;
+                    return null;
 
-                    }
                 }
+            }
 
-                if (attr === "auto") {
-
-                    w = new imscUtils.ComputedLength(1, 0);
+            if (attr === "auto") {
 
-                } else {
+                w = new ComputedLength(1, 0);
 
-                    w = imscUtils.toComputedLength(
-                        attr.w.value,
-                        attr.w.unit,
-                        null,
-                        doc.dimensions.w,
-                        null,
-                        doc.pxLength.w
-                        );
+            } else {
 
-                    if (w === null) {
+                w = toComputedLength(
+                    attr.w.value,
+                    attr.w.unit,
+                    null,
+                    doc.dimensions.w,
+                    null,
+                    doc.pxLength.w
+                );
 
-                        return null;
+                if (w === null) {
 
-                    }
+                    return null;
 
                 }
 
-                return {'h': h, 'w': w};
             }
-        ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "fontFamily",
-            "default",
-            ['span', 'p'],
-            true,
-            true,
-            function (str) {
-                var ffs = str.split(",");
-                var rslt = [];
-
-                for (var i = 0; i < ffs.length; i++) {
-                    ffs[i] = ffs[i].trim();
 
-                    if (ffs[i].charAt(0) !== "'" && ffs[i].charAt(0) !== '"') {
+            return { 'h': h, 'w': w };
+        }
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "fontFamily",
+        "default",
+        ['span', 'p'],
+        true,
+        true,
+        function (str) {
+            var ffs = str.split(",");
+            var rslt = [];
 
-                        if (ffs[i] === "default") {
+            for (var i = 0; i < ffs.length; i++) {
+                ffs[i] = ffs[i].trim();
 
-                            /* per IMSC1 */
+                if (ffs[i].charAt(0) !== "'" && ffs[i].charAt(0) !== '"') {
 
-                            rslt.push("monospaceSerif");
+                    if (ffs[i] === "default") {
 
-                        } else {
+                        /* per IMSC1 */
 
-                            rslt.push(ffs[i]);
-
-                        }
+                        rslt.push("monospaceSerif");
 
                     } else {
 
@@ -215,1002 +211,1003 @@
 
                     }
 
-                }
+                } else {
 
-                return rslt;
-            },
-            null
-            ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "shear",
-            "0%",
-            ['p'],
-            true,
-            true,
-            imscUtils.parseLength,
-            function (doc, parent, element, attr) {
+                    rslt.push(ffs[i]);
 
-                var fs;
+                }
 
-                if (attr.unit === "%") {
+            }
 
-                    fs = Math.abs(attr.value) > 100 ? Math.sign(attr.value) * 100 : attr.value;
+            return rslt;
+        },
+        null
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "shear",
+        "0%",
+        ['p'],
+        true,
+        true,
+        parseLength,
+        function (doc, parent, element, attr) {
 
-                } else {
+            var fs;
 
-                    return null;
+            if (attr.unit === "%") {
 
-                }
+                fs = Math.abs(attr.value) > 100 ? Math.sign(attr.value) * 100 : attr.value;
 
-                return fs;
-            }
-        ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "fontSize",
-            "1c",
-            ['span', 'p'],
-            true,
-            true,
-            imscUtils.parseLength,
-            function (doc, parent, element, attr, context) {
-
-                var fs;
-
-                fs = imscUtils.toComputedLength(
-                    attr.value,
-                    attr.unit,
-                    parent !== null ? parent.styleAttrs[imscStyles.byName.fontSize.qname] : doc.cellLength.h,
-                    parent !== null ? parent.styleAttrs[imscStyles.byName.fontSize.qname] : doc.cellLength.h,
-                    doc.cellLength.h,
-                    doc.pxLength.h
-                    );
+            } else {
 
-                return fs;
-            }
-        ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "fontStyle",
-            "normal",
-            ['span', 'p'],
-            true,
-            true,
-            function (str) {
-                /* TODO: handle font style */
+                return null;
 
-                return str;
-            },
-            null
-            ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "fontWeight",
-            "normal",
-            ['span', 'p'],
-            true,
-            true,
-            function (str) {
-                /* TODO: handle font weight */
+            }
 
+            return fs;
+        }
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "fontSize",
+        "1c",
+        ['span', 'p'],
+        true,
+        true,
+        parseLength,
+        function (doc, parent, element, attr, context) {
+
+            var fs;
+
+            fs = toComputedLength(
+                attr.value,
+                attr.unit,
+                parent !== null ? parent.styleAttrs[byName.fontSize.qname] : doc.cellLength.h,
+                parent !== null ? parent.styleAttrs[byName.fontSize.qname] : doc.cellLength.h,
+                doc.cellLength.h,
+                doc.pxLength.h
+            );
+
+            return fs;
+        }
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "fontStyle",
+        "normal",
+        ['span', 'p'],
+        true,
+        true,
+        function (str) {
+            /* TODO: handle font style */
+
+            return str;
+        },
+        null
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "fontWeight",
+        "normal",
+        ['span', 'p'],
+        true,
+        true,
+        function (str) {
+            /* TODO: handle font weight */
+
+            return str;
+        },
+        null
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "lineHeight",
+        "normal",
+        ['p'],
+        true,
+        true,
+        function (str) {
+            if (str === "normal") {
                 return str;
-            },
-            null
-            ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "lineHeight",
-            "normal",
-            ['p'],
-            true,
-            true,
-            function (str) {
-                if (str === "normal") {
-                    return str;
-                } else {
-                    return imscUtils.parseLength(str);
-                }
-            },
-            function (doc, parent, element, attr, context) {
+            } else {
+                return parseLength(str);
+            }
+        },
+        function (doc, parent, element, attr, context) {
 
-                var lh;
+            var lh;
 
-                if (attr === "normal") {
+            if (attr === "normal") {
 
-                    /* inherit normal per https://github.com/w3c/ttml1/issues/220 */
+                /* inherit normal per https://github.com/w3c/ttml1/issues/220 */
 
-                    lh = attr;
+                lh = attr;
 
-                } else {
+            } else {
 
-                    lh = imscUtils.toComputedLength(
-                        attr.value,
-                        attr.unit,
-                        element.styleAttrs[imscStyles.byName.fontSize.qname],
-                        element.styleAttrs[imscStyles.byName.fontSize.qname],
-                        doc.cellLength.h,
-                        doc.pxLength.h
-                        );
-
-                    if (lh === null) {
+                lh = toComputedLength(
+                    attr.value,
+                    attr.unit,
+                    element.styleAttrs[byName.fontSize.qname],
+                    element.styleAttrs[byName.fontSize.qname],
+                    doc.cellLength.h,
+                    doc.pxLength.h
+                );
 
-                        return null;
+                if (lh === null) {
 
-                    }
+                    return null;
 
                 }
 
-                /* TODO: create a Length constructor */
-
-                return lh;
             }
-        ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "opacity",
-            1.0,
-            ['region'],
-            false,
-            true,
-            parseFloat,
-            null
-            ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "origin",
-            "auto",
-            ['region'],
-            false,
-            true,
-            function (str) {
-
-                if (str === "auto") {
-
-                    return str;
 
-                } else {
+            /* TODO: create a Length constructor */
+
+            return lh;
+        }
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "opacity",
+        1.0,
+        ['region'],
+        false,
+        true,
+        parseFloat,
+        null
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "origin",
+        "auto",
+        ['region'],
+        false,
+        true,
+        function (str) {
+
+            if (str === "auto") {
 
-                    var s = str.split(" ");
-                    if (s.length !== 2)
-                        return null;
-                    var w = imscUtils.parseLength(s[0]);
-                    var h = imscUtils.parseLength(s[1]);
-                    if (!h || !w)
-                        return null;
-                    return {'h': h, 'w': w};
-                }
+                return str;
 
-            },
-            function (doc, parent, element, attr, context) {
+            } else {
 
-                var h;
-                var w;
+                var s = str.split(" ");
+                if (s.length !== 2)
+                    return null;
+                var w = parseLength(s[0]);
+                var h = parseLength(s[1]);
+                if (!h || !w)
+                    return null;
+                return { 'h': h, 'w': w };
+            }
 
-                if (attr === "auto") {
+        },
+        function (doc, parent, element, attr, context) {
 
-                    h = new imscUtils.ComputedLength(0,0);
+            var h;
+            var w;
 
-                } else {
+            if (attr === "auto") {
 
-                    h = imscUtils.toComputedLength(
-                        attr.h.value,
-                        attr.h.unit,
-                        null,
-                        doc.dimensions.h,
-                        null,
-                        doc.pxLength.h
-                        );
+                h = new ComputedLength(0, 0);
 
-                    if (h === null) {
+            } else {
 
-                        return null;
+                h = toComputedLength(
+                    attr.h.value,
+                    attr.h.unit,
+                    null,
+                    doc.dimensions.h,
+                    null,
+                    doc.pxLength.h
+                );
 
-                    }
+                if (h === null) {
+
+                    return null;
 
                 }
 
-                if (attr === "auto") {
+            }
 
-                    w = new imscUtils.ComputedLength(0,0);
+            if (attr === "auto") {
 
-                } else {
+                w = new ComputedLength(0, 0);
 
-                    w = imscUtils.toComputedLength(
-                        attr.w.value,
-                        attr.w.unit,
-                        null,
-                        doc.dimensions.w,
-                        null,
-                        doc.pxLength.w
-                        );
+            } else {
 
-                    if (w === null) {
+                w = toComputedLength(
+                    attr.w.value,
+                    attr.w.unit,
+                    null,
+                    doc.dimensions.w,
+                    null,
+                    doc.pxLength.w
+                );
 
-                        return null;
+                if (w === null) {
 
-                    }
+                    return null;
 
                 }
 
-                return {'h': h, 'w': w};
             }
-        ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "overflow",
-            "hidden",
-            ['region'],
-            false,
-            true,
-            function (str) {
-                return str;
-            },
-            null
-            ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "padding",
-            "0px",
-            ['region'],
-            false,
-            true,
-            function (str) {
 
-                var s = str.split(" ");
-                if (s.length > 4)
+            return { 'h': h, 'w': w };
+        }
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "overflow",
+        "hidden",
+        ['region'],
+        false,
+        true,
+        function (str) {
+            return str;
+        },
+        null
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "padding",
+        "0px",
+        ['region'],
+        false,
+        true,
+        function (str) {
+
+            var s = str.split(" ");
+            if (s.length > 4)
+                return null;
+            var r = [];
+            for (var i = 0; i < s.length; i++) {
+
+                var l = parseLength(s[i]);
+                if (!l)
                     return null;
-                var r = [];
-                for (var i = 0; i < s.length; i++) {
+                r.push(l);
+            }
 
-                    var l = imscUtils.parseLength(s[i]);
-                    if (!l)
-                        return null;
-                    r.push(l);
-                }
+            return r;
+        },
+        function (doc, parent, element, attr, context) {
 
-                return r;
-            },
-            function (doc, parent, element, attr, context) {
+            var padding;
 
-                var padding;
+            /* TODO: make sure we are in region */
 
-                /* TODO: make sure we are in region */
+            /*
+             * expand padding shortcuts to 
+             * [before, end, after, start]
+             * 
+             */
 
-                /*
-                 * expand padding shortcuts to 
-                 * [before, end, after, start]
-                 * 
-                 */
+            if (attr.length === 1) {
 
-                if (attr.length === 1) {
+                padding = [attr[0], attr[0], attr[0], attr[0]];
 
-                    padding = [attr[0], attr[0], attr[0], attr[0]];
+            } else if (attr.length === 2) {
 
-                } else if (attr.length === 2) {
+                padding = [attr[0], attr[1], attr[0], attr[1]];
 
-                    padding = [attr[0], attr[1], attr[0], attr[1]];
+            } else if (attr.length === 3) {
 
-                } else if (attr.length === 3) {
+                padding = [attr[0], attr[1], attr[2], attr[1]];
 
-                    padding = [attr[0], attr[1], attr[2], attr[1]];
+            } else if (attr.length === 4) {
 
-                } else if (attr.length === 4) {
+                padding = [attr[0], attr[1], attr[2], attr[3]];
 
-                    padding = [attr[0], attr[1], attr[2], attr[3]];
+            } else {
 
-                } else {
+                return null;
 
-                    return null;
+            }
 
-                }
+            /* TODO: take into account tts:direction */
 
-                /* TODO: take into account tts:direction */
+            /* 
+             * transform [before, end, after, start] according to writingMode to 
+             * [top,left,bottom,right]
+             * 
+             */
 
-                /* 
-                 * transform [before, end, after, start] according to writingMode to 
-                 * [top,left,bottom,right]
-                 * 
-                 */
+            var dir = element.styleAttrs[byName.writingMode.qname];
 
-                var dir = element.styleAttrs[imscStyles.byName.writingMode.qname];
+            if (dir === "lrtb" || dir === "lr") {
 
-                if (dir === "lrtb" || dir === "lr") {
+                padding = [padding[0], padding[3], padding[2], padding[1]];
 
-                    padding = [padding[0], padding[3], padding[2], padding[1]];
+            } else if (dir === "rltb" || dir === "rl") {
 
-                } else if (dir === "rltb" || dir === "rl") {
+                padding = [padding[0], padding[1], padding[2], padding[3]];
 
-                    padding = [padding[0], padding[1], padding[2], padding[3]];
+            } else if (dir === "tblr") {
 
-                } else if (dir === "tblr") {
+                padding = [padding[3], padding[0], padding[1], padding[2]];
 
-                    padding = [padding[3], padding[0], padding[1], padding[2]];
+            } else if (dir === "tbrl" || dir === "tb") {
 
-                } else if (dir === "tbrl" || dir === "tb") {
+                padding = [padding[3], padding[2], padding[1], padding[0]];
 
-                    padding = [padding[3], padding[2], padding[1], padding[0]];
+            } else {
 
-                } else {
-
-                    return null;
+                return null;
 
-                }
+            }
 
-                var out = [];
+            var out = [];
 
-                for (var i = 0 ; i < padding.length; i++) {
+            for (var i = 0; i < padding.length; i++) {
 
-                    if (padding[i].value === 0) {
+                if (padding[i].value === 0) {
 
-                        out[i] = new imscUtils.ComputedLength(0,0);
+                    out[i] = new ComputedLength(0, 0);
 
-                    } else {
+                } else {
 
-                        out[i] = imscUtils.toComputedLength(
-                            padding[i].value,
-                            padding[i].unit,
-                            element.styleAttrs[imscStyles.byName.fontSize.qname],
-                            i === 0 || i === 2 ? element.styleAttrs[imscStyles.byName.extent.qname].h : element.styleAttrs[imscStyles.byName.extent.qname].w,
-                            i === 0 || i === 2 ? doc.cellLength.h : doc.cellLength.w,
-                            i === 0 || i === 2 ? doc.pxLength.h: doc.pxLength.w
-                            );
+                    out[i] = toComputedLength(
+                        padding[i].value,
+                        padding[i].unit,
+                        element.styleAttrs[byName.fontSize.qname],
+                        i === 0 || i === 2 ? element.styleAttrs[byName.extent.qname].h : element.styleAttrs[byName.extent.qname].w,
+                        i === 0 || i === 2 ? doc.cellLength.h : doc.cellLength.w,
+                        i === 0 || i === 2 ? doc.pxLength.h : doc.pxLength.w
+                    );
 
-                        if (out[i] === null) return null;
+                    if (out[i] === null) return null;
 
-                    }
                 }
-
-
-                return out;
             }
-        ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "position",
-            "top left",
-            ['region'],
-            false,
-            true,
-            function (str) {
-
-                return imscUtils.parsePosition(str);
-
-            },
-            function (doc, parent, element, attr) {
-                var h;
-                var w;
-                
-                h = imscUtils.toComputedLength(
-                    attr.v.offset.value,
-                    attr.v.offset.unit,
-                    null,
-                    new imscUtils.ComputedLength(
-                        - element.styleAttrs[imscStyles.byName.extent.qname].h.rw,
-                        doc.dimensions.h.rh - element.styleAttrs[imscStyles.byName.extent.qname].h.rh 
-                    ),
-                    null,
-                    doc.pxLength.h
-                    );
 
-                if (h === null) return null;
 
+            return out;
+        }
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "position",
+        "top left",
+        ['region'],
+        false,
+        true,
+        function (str) {
 
-                if (attr.v.edge === "bottom") {
+            return parsePosition(str);
 
-                    h = new imscUtils.ComputedLength(
-                        - h.rw - element.styleAttrs[imscStyles.byName.extent.qname].h.rw,
-                        doc.dimensions.h.rh - h.rh - element.styleAttrs[imscStyles.byName.extent.qname].h.rh
-                    );
-            
-                }
+        },
+        function (doc, parent, element, attr) {
+            var h;
+            var w;
 
-                w = imscUtils.toComputedLength(
-                    attr.h.offset.value,
-                    attr.h.offset.unit,
-                    null,
-                    new imscUtils.ComputedLength(
-                        doc.dimensions.w.rw - element.styleAttrs[imscStyles.byName.extent.qname].w.rw,
-                        - element.styleAttrs[imscStyles.byName.extent.qname].w.rh
-                    ),
-                    null,
-                    doc.pxLength.w
-                    );
+            h = toComputedLength(
+                attr.v.offset.value,
+                attr.v.offset.unit,
+                null,
+                new ComputedLength(
+                    - element.styleAttrs[byName.extent.qname].h.rw,
+                    doc.dimensions.h.rh - element.styleAttrs[byName.extent.qname].h.rh
+                ),
+                null,
+                doc.pxLength.h
+            );
 
-                if (h === null) return null;
+            if (h === null) return null;
 
-                if (attr.h.edge === "right") {
-                    
-                    w = new imscUtils.ComputedLength(
-                        doc.dimensions.w.rw - w.rw - element.styleAttrs[imscStyles.byName.extent.qname].w.rw,
-                        - w.rh - element.styleAttrs[imscStyles.byName.extent.qname].w.rh
-                    );
 
-                }
+            if (attr.v.edge === "bottom") {
 
-                return {'h': h, 'w': w};
-            }
-        ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "ruby",
-            "none",
-            ['span'],
-            false,
-            true,
-            function (str) {
-                return str;
-            },
-            null
-            ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "rubyAlign",
-            "center",
-            ['span'],
-            true,
-            true,
-            function (str) {
-                
-                if (! (str === "center" || str === "spaceAround")) {
-                    return null;
-                }
-                
-                return str;
-            },
-            null
-            ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "rubyPosition",
-            "outside",
-            ['span'],
-            true,
-            true,
-            function (str) {
-                return str;
-            },
-            null
-            ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "rubyReserve",
-            "none",
-            ['p'],
-            true,
-            true,
-            function (str) {
-                var s = str.split(" ");
+                h = new ComputedLength(
+                    - h.rw - element.styleAttrs[byName.extent.qname].h.rw,
+                    doc.dimensions.h.rh - h.rh - element.styleAttrs[byName.extent.qname].h.rh
+                );
 
-                var r = [null, null];
+            }
 
-                if (s.length === 0 || s.length > 2)
-                    return null;
+            w = toComputedLength(
+                attr.h.offset.value,
+                attr.h.offset.unit,
+                null,
+                new ComputedLength(
+                    doc.dimensions.w.rw - element.styleAttrs[byName.extent.qname].w.rw,
+                    - element.styleAttrs[byName.extent.qname].w.rh
+                ),
+                null,
+                doc.pxLength.w
+            );
 
-                if (s[0] === "none" ||
-                    s[0] === "both" ||
-                    s[0] === "after" ||
-                    s[0] === "before" ||
-                    s[0] === "outside") {
+            if (h === null) return null;
 
-                    r[0] = s[0];
+            if (attr.h.edge === "right") {
 
-                } else {
+                w = new ComputedLength(
+                    doc.dimensions.w.rw - w.rw - element.styleAttrs[byName.extent.qname].w.rw,
+                    - w.rh - element.styleAttrs[byName.extent.qname].w.rh
+                );
 
-                    return null;
+            }
 
-                }
+            return { 'h': h, 'w': w };
+        }
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "ruby",
+        "none",
+        ['span'],
+        false,
+        true,
+        function (str) {
+            return str;
+        },
+        null
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "rubyAlign",
+        "center",
+        ['span'],
+        true,
+        true,
+        function (str) {
+
+            if (!(str === "center" || str === "spaceAround")) {
+                return null;
+            }
 
-                if (s.length === 2 && s[0] !== "none") {
+            return str;
+        },
+        null
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "rubyPosition",
+        "outside",
+        ['span'],
+        true,
+        true,
+        function (str) {
+            return str;
+        },
+        null
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "rubyReserve",
+        "none",
+        ['p'],
+        true,
+        true,
+        function (str) {
+            var s = str.split(" ");
+
+            var r = [null, null];
+
+            if (s.length === 0 || s.length > 2)
+                return null;
 
-                    var l = imscUtils.parseLength(s[1]);
+            if (s[0] === "none" ||
+                s[0] === "both" ||
+                s[0] === "after" ||
+                s[0] === "before" ||
+                s[0] === "outside") {
 
-                    if (l) {
+                r[0] = s[0];
 
-                        r[1] = l;
+            } else {
 
-                    } else {
+                return null;
 
-                        return null;
+            }
 
-                    }
+            if (s.length === 2 && s[0] !== "none") {
 
-                }
+                var l = parseLength(s[1]);
 
+                if (l) {
 
-                return r;
-            },
-            function (doc, parent, element, attr, context) {
+                    r[1] = l;
 
-                if (attr[0] === "none") {
+                } else {
 
-                    return attr;
+                    return null;
 
                 }
 
-                var fs = null;
-
-                if (attr[1] === null) {
+            }
 
-                    fs = new imscUtils.ComputedLength(
-                            element.styleAttrs[imscStyles.byName.fontSize.qname].rw * 0.5,
-                            element.styleAttrs[imscStyles.byName.fontSize.qname].rh * 0.5
-                    );
 
-                } else {
+            return r;
+        },
+        function (doc, parent, element, attr, context) {
 
-                    fs = imscUtils.toComputedLength(attr[1].value,
-                        attr[1].unit,
-                        element.styleAttrs[imscStyles.byName.fontSize.qname],
-                        element.styleAttrs[imscStyles.byName.fontSize.qname],
-                        doc.cellLength.h,
-                        doc.pxLength.h
-                        );
-                
-                }
+            if (attr[0] === "none") {
 
-                if (fs === null) return null;
+                return attr;
 
-                return [attr[0], fs];
             }
-        ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "showBackground",
-            "always",
-            ['region'],
-            false,
-            true,
-            function (str) {
-                return str;
-            },
-            null
-            ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "textAlign",
-            "start",
-            ['p'],
-            true,
-            true,
-            function (str) {
-                return str;
-            },
-            function (doc, parent, element, attr, context) {
-                /* Section 7.16.9 of XSL */
 
-                if (attr === "left") {
+            var fs = null;
 
-                    return "start";
+            if (attr[1] === null) {
 
-                } else if (attr === "right") {
+                fs = new ComputedLength(
+                    element.styleAttrs[byName.fontSize.qname].rw * 0.5,
+                    element.styleAttrs[byName.fontSize.qname].rh * 0.5
+                );
 
-                    return "end";
-
-                } else {
+            } else {
 
-                    return attr;
+                fs = toComputedLength(attr[1].value,
+                    attr[1].unit,
+                    element.styleAttrs[byName.fontSize.qname],
+                    element.styleAttrs[byName.fontSize.qname],
+                    doc.cellLength.h,
+                    doc.pxLength.h
+                );
 
-                }
             }
-        ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "textCombine",
-            "none",
-            ['span'],
-            true,
-            true,
-            function (str) {
-                if (str === "none" || str === "all") {
-
-                    return str;
-                }
 
-                return null;
-            },
-            null
-            ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "textDecoration",
-            "none",
-            ['span'],
-            true,
-            true,
-            function (str) {
-                return str.split(" ");
-            },
-            null
-            ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "textEmphasis",
-            "none",
-            ['span'],
-            true,
-            true,
-            function (str) {
-                var e = str.split(" ");
-
-                var rslt = {style: null, symbol: null, color: null, position: null};
+            if (fs === null) return null;
+
+            return [attr[0], fs];
+        }
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "showBackground",
+        "always",
+        ['region'],
+        false,
+        true,
+        function (str) {
+            return str;
+        },
+        null
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "textAlign",
+        "start",
+        ['p'],
+        true,
+        true,
+        function (str) {
+            return str;
+        },
+        function (doc, parent, element, attr, context) {
+            /* Section 7.16.9 of XSL */
+
+            if (attr === "left") {
+
+                return "start";
+
+            } else if (attr === "right") {
+
+                return "end";
+
+            } else {
+
+                return attr;
 
-                for (var i = 0; i < e.length; i++) {
+            }
+        }
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "textCombine",
+        "none",
+        ['span'],
+        true,
+        true,
+        function (str) {
+            if (str === "none" || str === "all") {
 
-                    if (e[i] === "none" || e[i] === "auto") {
+                return str;
+            }
 
-                        rslt.style = e[i];
+            return null;
+        },
+        null
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "textDecoration",
+        "none",
+        ['span'],
+        true,
+        true,
+        function (str) {
+            return str.split(" ");
+        },
+        null
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "textEmphasis",
+        "none",
+        ['span'],
+        true,
+        true,
+        function (str) {
+            var e = str.split(" ");
 
-                    } else if (e[i] === "filled" ||
-                        e[i] === "open") {
+            var rslt = { style: null, symbol: null, color: null, position: null };
 
-                        rslt.style = e[i];
+            for (var i = 0; i < e.length; i++) {
 
-                    } else if (e[i] === "circle" ||
-                        e[i] === "dot" ||
-                        e[i] === "sesame") {
+                if (e[i] === "none" || e[i] === "auto") {
 
-                        rslt.symbol = e[i];
+                    rslt.style = e[i];
 
-                    } else if (e[i] === "current") {
+                } else if (e[i] === "filled" ||
+                    e[i] === "open") {
 
-                        rslt.color = e[i];
+                    rslt.style = e[i];
 
-                    } else if (e[i] === "outside" || e[i] === "before" || e[i] === "after") {
+                } else if (e[i] === "circle" ||
+                    e[i] === "dot" ||
+                    e[i] === "sesame") {
 
-                        rslt.position = e[i];
+                    rslt.symbol = e[i];
 
-                    } else {
+                } else if (e[i] === "current") {
 
-                        rslt.color = imscUtils.parseColor(e[i]);
+                    rslt.color = e[i];
 
-                        if (rslt.color === null)
-                            return null;
+                } else if (e[i] === "outside" || e[i] === "before" || e[i] === "after") {
 
-                    }
-                }
-
-                if (rslt.style == null && rslt.symbol == null) {
-
-                    rslt.style = "auto";
+                    rslt.position = e[i];
 
                 } else {
 
-                    rslt.symbol = rslt.symbol || "circle";
-                    rslt.style = rslt.style || "filled";
+                    rslt.color = parseColor(e[i]);
 
-                }
+                    if (rslt.color === null)
+                        return null;
 
-                rslt.position = rslt.position || "outside";
-                rslt.color = rslt.color || "current";
+                }
+            }
 
-                return rslt;
-            },
-            null
-            ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "textOutline",
-            "none",
-            ['span'],
-            true,
-            true,
-            function (str) {
+            if (rslt.style == null && rslt.symbol == null) {
 
-                /*
-                 * returns {c: <color>?, thichness: <length>} | "none"
-                 * 
-                 */
+                rslt.style = "auto";
 
-                if (str === "none") {
+            } else {
 
-                    return str;
+                rslt.symbol = rslt.symbol || "circle";
+                rslt.style = rslt.style || "filled";
 
-                } else {
+            }
 
-                    var r = {};
-                    var s = str.split(" ");
-                    if (s.length === 0 || s.length > 2)
-                        return null;
-                    var c = imscUtils.parseColor(s[0]);
+            rslt.position = rslt.position || "outside";
+            rslt.color = rslt.color || "current";
+
+            return rslt;
+        },
+        null
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "textOutline",
+        "none",
+        ['span'],
+        true,
+        true,
+        function (str) {
+
+            /*
+             * returns {c: <color>?, thichness: <length>} | "none"
+             * 
+             */
+
+            if (str === "none") {
 
-                    r.color = c;
+                return str;
 
-                    if (c !== null)
-                        s.shift();
+            } else {
 
-                    if (s.length !== 1)
-                        return null;
+                var r = {};
+                var s = str.split(" ");
+                if (s.length === 0 || s.length > 2)
+                    return null;
+                var c = parseColor(s[0]);
 
-                    var l = imscUtils.parseLength(s[0]);
+                r.color = c;
 
-                    if (!l)
-                        return null;
+                if (c !== null)
+                    s.shift();
 
-                    r.thickness = l;
+                if (s.length !== 1)
+                    return null;
 
-                    return r;
-                }
+                var l = parseLength(s[0]);
 
-            },
-            function (doc, parent, element, attr, context) {
+                if (!l)
+                    return null;
 
-                /*
-                 * returns {color: <color>, thickness: <norm length>}
-                 * 
-                 */
+                r.thickness = l;
 
-                if (attr === "none")
-                    return attr;
+                return r;
+            }
 
-                var rslt = {};
+        },
+        function (doc, parent, element, attr, context) {
 
-                if (attr.color === null) {
+            /*
+             * returns {color: <color>, thickness: <norm length>}
+             * 
+             */
 
-                    rslt.color = element.styleAttrs[imscStyles.byName.color.qname];
+            if (attr === "none")
+                return attr;
 
-                } else {
+            var rslt = {};
 
-                    rslt.color = attr.color;
+            if (attr.color === null) {
 
-                }
+                rslt.color = element.styleAttrs[byName.color.qname];
 
-                rslt.thickness = imscUtils.toComputedLength(
-                    attr.thickness.value,
-                    attr.thickness.unit,
-                    element.styleAttrs[imscStyles.byName.fontSize.qname],
-                    element.styleAttrs[imscStyles.byName.fontSize.qname],
-                    doc.cellLength.h,
-                    doc.pxLength.h
-                    );
+            } else {
 
-                if (rslt.thickness === null)
-                    return null;
+                rslt.color = attr.color;
 
-                return rslt;
             }
-        ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "textShadow",
-            "none",
-            ['span'],
-            true,
-            true,
-            imscUtils.parseTextShadow,
-            function (doc, parent, element, attr) {
-
-                /*
-                 * returns [{x_off: <length>, y_off: <length>, b_radius: <length>, color: <color>}*] or "none"
-                 * 
-                 */
-
-                if (attr === "none")
-                    return attr;
-
-                var r = [];
-
-                for (var i = 0; i < attr.length; i++) {
-
-                    var shadow = {};
-
-                    shadow.x_off = imscUtils.toComputedLength(
-                        attr[i][0].value,
-                        attr[i][0].unit,
-                        null,
-                        element.styleAttrs[imscStyles.byName.fontSize.qname],
-                        null,
-                        doc.pxLength.w
-                        );
 
-                    if (shadow.x_off === null)
-                        return null;
+            rslt.thickness = toComputedLength(
+                attr.thickness.value,
+                attr.thickness.unit,
+                element.styleAttrs[byName.fontSize.qname],
+                element.styleAttrs[byName.fontSize.qname],
+                doc.cellLength.h,
+                doc.pxLength.h
+            );
 
-                    shadow.y_off = imscUtils.toComputedLength(
-                        attr[i][1].value,
-                        attr[i][1].unit,
-                        null,
-                        element.styleAttrs[imscStyles.byName.fontSize.qname],
-                        null,
-                        doc.pxLength.h
-                        );
+            if (rslt.thickness === null)
+                return null;
 
-                    if (shadow.y_off === null)
-                        return null;
+            return rslt;
+        }
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "textShadow",
+        "none",
+        ['span'],
+        true,
+        true,
+        parseTextShadow,
+        function (doc, parent, element, attr) {
 
-                    if (attr[i][2] === null) {
+            /*
+             * returns [{x_off: <length>, y_off: <length>, b_radius: <length>, color: <color>}*] or "none"
+             * 
+             */
 
-                        shadow.b_radius = 0;
+            if (attr === "none")
+                return attr;
 
-                    } else {
+            var r = [];
 
-                        shadow.b_radius = imscUtils.toComputedLength(
-                            attr[i][2].value,
-                            attr[i][2].unit,
-                            null,
-                            element.styleAttrs[imscStyles.byName.fontSize.qname],
-                            null,
-                            doc.pxLength.h
-                            );
+            for (var i = 0; i < attr.length; i++) {
 
-                        if (shadow.b_radius === null)
-                            return null;
+                var shadow = {};
 
-                    }
+                shadow.x_off = toComputedLength(
+                    attr[i][0].value,
+                    attr[i][0].unit,
+                    null,
+                    element.styleAttrs[byName.fontSize.qname],
+                    null,
+                    doc.pxLength.w
+                );
 
-                    if (attr[i][3] === null) {
+                if (shadow.x_off === null)
+                    return null;
 
-                        shadow.color = element.styleAttrs[imscStyles.byName.color.qname];
+                shadow.y_off = toComputedLength(
+                    attr[i][1].value,
+                    attr[i][1].unit,
+                    null,
+                    element.styleAttrs[byName.fontSize.qname],
+                    null,
+                    doc.pxLength.h
+                );
 
-                    } else {
+                if (shadow.y_off === null)
+                    return null;
 
-                        shadow.color = attr[i][3];
+                if (attr[i][2] === null) {
 
-                    }
+                    shadow.b_radius = 0;
 
-                    r.push(shadow);
+                } else {
 
-                }
+                    shadow.b_radius = toComputedLength(
+                        attr[i][2].value,
+                        attr[i][2].unit,
+                        null,
+                        element.styleAttrs[byName.fontSize.qname],
+                        null,
+                        doc.pxLength.h
+                    );
 
-                return r;
-            }
-        ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "unicodeBidi",
-            "normal",
-            ['span', 'p'],
-            false,
-            true,
-            function (str) {
-                return str;
-            },
-            null
-            ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "visibility",
-            "visible",
-            ['body', 'div', 'p', 'region', 'span'],
-            true,
-            true,
-            function (str) {
-                return str;
-            },
-            null
-            ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "wrapOption",
-            "wrap",
-            ['span'],
-            true,
-            true,
-            function (str) {
-                return str;
-            },
-            null
-            ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "writingMode",
-            "lrtb",
-            ['region'],
-            false,
-            true,
-            function (str) {
-                return str;
-            },
-            null
-            ),
-        new StylingAttributeDefinition(
-            imscNames.ns_tts,
-            "zIndex",
-            "auto",
-            ['region'],
-            false,
-            true,
-            function (str) {
+                    if (shadow.b_radius === null)
+                        return null;
 
-                var rslt;
+                }
 
-                if (str === 'auto') {
+                if (attr[i][3] === null) {
 
-                    rslt = str;
+                    shadow.color = element.styleAttrs[byName.color.qname];
 
                 } else {
 
-                    rslt = parseInt(str);
-
-                    if (isNaN(rslt)) {
-                        rslt = null;
-                    }
+                    shadow.color = attr[i][3];
 
                 }
 
-                return rslt;
-            },
-            null
-            ),
-        new StylingAttributeDefinition(
-            imscNames.ns_ebutts,
-            "linePadding",
-            "0c",
-            ['p'],
-            true,
-            false,
-            imscUtils.parseLength,
-            function (doc, parent, element, attr, context) {
-
-                return imscUtils.toComputedLength(attr.value, attr.unit, null, null, doc.cellLength.w, null);
+                r.push(shadow);
 
             }
-        ),
-        new StylingAttributeDefinition(
-            imscNames.ns_ebutts,
-            "multiRowAlign",
-            "auto",
-            ['p'],
-            true,
-            false,
-            function (str) {
-                return str;
-            },
-            null
-            ),
-        new StylingAttributeDefinition(
-            imscNames.ns_smpte,
-            "backgroundImage",
-            null,
-            ['div'],
-            false,
-            false,
-            function (str) {
-                return str;
-            },
-            null
-            ),
-        new StylingAttributeDefinition(
-            imscNames.ns_itts,
-            "forcedDisplay",
-            "false",
-            ['body', 'div', 'p', 'region', 'span'],
-            true,
-            true,
-            function (str) {
-                return str === 'true' ? true : false;
-            },
-            null
-            ),
-        new StylingAttributeDefinition(
-            imscNames.ns_itts,
-            "fillLineGap",
-            "false",
-            ['p'],
-            true,
-            true,
-            function (str) {
-                return str === 'true' ? true : false;
-            },
-            null
-            )
-    ];
-
-    /* TODO: allow null parse function */
-
-    imscStyles.byQName = {};
-    for (var i in imscStyles.all) {
-
-        imscStyles.byQName[imscStyles.all[i].qname] = imscStyles.all[i];
-    }
-
-    imscStyles.byName = {};
-    for (var j in imscStyles.all) {
 
-        imscStyles.byName[imscStyles.all[j].name] = imscStyles.all[j];
-    }
+            return r;
+        }
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "unicodeBidi",
+        "normal",
+        ['span', 'p'],
+        false,
+        true,
+        function (str) {
+            return str;
+        },
+        null
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "visibility",
+        "visible",
+        ['body', 'div', 'p', 'region', 'span'],
+        true,
+        true,
+        function (str) {
+            return str;
+        },
+        null
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "wrapOption",
+        "wrap",
+        ['span'],
+        true,
+        true,
+        function (str) {
+            return str;
+        },
+        null
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "writingMode",
+        "lrtb",
+        ['region'],
+        false,
+        true,
+        function (str) {
+            return str;
+        },
+        null
+    ),
+    new StylingAttributeDefinition(
+        ns_tts,
+        "zIndex",
+        "auto",
+        ['region'],
+        false,
+        true,
+        function (str) {
+
+            var rslt;
+
+            if (str === 'auto') {
+
+                rslt = str;
+
+            } else {
+
+                rslt = parseInt(str);
+
+                if (isNaN(rslt)) {
+                    rslt = null;
+                }
 
+            }
 
-})(typeof exports === 'undefined' ? this.imscStyles = {} : exports,
-    typeof imscNames === 'undefined' ? require("./names") : imscNames,
-    typeof imscUtils === 'undefined' ? require("./utils") : imscUtils);
+            return rslt;
+        },
+        null
+    ),
+    new StylingAttributeDefinition(
+        ns_ebutts,
+        "linePadding",
+        "0c",
+        ['p'],
+        true,
+        false,
+        parseLength,
+        function (doc, parent, element, attr, context) {
+
+            return toComputedLength(attr.value, attr.unit, null, null, doc.cellLength.w, null);
+
+        }
+    ),
+    new StylingAttributeDefinition(
+        ns_ebutts,
+        "multiRowAlign",
+        "auto",
+        ['p'],
+        true,
+        false,
+        function (str) {
+            return str;
+        },
+        null
+    ),
+    new StylingAttributeDefinition(
+        ns_smpte,
+        "backgroundImage",
+        null,
+        ['div'],
+        false,
+        false,
+        function (str) {
+            return str;
+        },
+        null
+    ),
+    new StylingAttributeDefinition(
+        ns_itts,
+        "forcedDisplay",
+        "false",
+        ['body', 'div', 'p', 'region', 'span'],
+        true,
+        true,
+        function (str) {
+            return str === 'true' ? true : false;
+        },
+        null
+    ),
+    new StylingAttributeDefinition(
+        ns_itts,
+        "fillLineGap",
+        "false",
+        ['p'],
+        true,
+        true,
+        function (str) {
+            return str === 'true' ? true : false;
+        },
+        null
+    )
+];
+
+/* TODO: allow null parse function */
+
+export const byQName = {};
+for (var i in all) {
+
+    byQName[all[i].qname] = all[i];
+}
+
+export const byName = {};
+for (var j in all) {
+
+    byName[all[j].name] = all[j];
+}
diff --git a/src/main/js/utils.js b/src/main/js/utils.js
index 90956bf7..cd4cc34c 100644
--- a/src/main/js/utils.js
+++ b/src/main/js/utils.js
@@ -28,391 +28,388 @@
  * @module imscUtils
  */
 
-;
-(function (imscUtils) { // wrapper for non-node envs
-
-    /* Documents the error handler interface */
-
-    /**
-     * @classdesc Generic interface for handling events. The interface exposes four
-     * methods:
-     * * <pre>info</pre>: unusual event that does not result in an inconsistent state
-     * * <pre>warn</pre>: unexpected event that should not result in an inconsistent state
-     * * <pre>error</pre>: unexpected event that may result in an inconsistent state
-     * * <pre>fatal</pre>: unexpected event that results in an inconsistent state
-     *   and termination of processing
-     * Each method takes a single <pre>string</pre> describing the event as argument,
-     * and returns a single <pre>boolean</pre>, which terminates processing if <pre>true</pre>.
-     *
-     * @name ErrorHandler
-     * @class
-     */
-
-
-    /*
-     * Parses a TTML color expression
-     * 
-     */
-
-    var HEX_COLOR_RE = /#([0-9a-fA-F]{2})([0-9a-fA-F]{2})([0-9a-fA-F]{2})([0-9a-fA-F]{2})?/;
-    var DEC_COLOR_RE = /rgb\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)/;
-    var DEC_COLORA_RE = /rgba\(\s*(\d+),\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)/;
-    var NAMED_COLOR = {
-        transparent: [0, 0, 0, 0],
-        black: [0, 0, 0, 255],
-        silver: [192, 192, 192, 255],
-        gray: [128, 128, 128, 255],
-        white: [255, 255, 255, 255],
-        maroon: [128, 0, 0, 255],
-        red: [255, 0, 0, 255],
-        purple: [128, 0, 128, 255],
-        fuchsia: [255, 0, 255, 255],
-        magenta: [255, 0, 255, 255],
-        green: [0, 128, 0, 255],
-        lime: [0, 255, 0, 255],
-        olive: [128, 128, 0, 255],
-        yellow: [255, 255, 0, 255],
-        navy: [0, 0, 128, 255],
-        blue: [0, 0, 255, 255],
-        teal: [0, 128, 128, 255],
-        aqua: [0, 255, 255, 255],
-        cyan: [0, 255, 255, 255]
-    };
 
-    imscUtils.parseColor = function (str) {
-
-        var m;
-        
-        var r = null;
-        
-        var nc = NAMED_COLOR[str.toLowerCase()];
-        
-        if (nc !== undefined) {
-
-            r = nc;
-
-        } else if ((m = HEX_COLOR_RE.exec(str)) !== null) {
-
-            r = [parseInt(m[1], 16),
-                parseInt(m[2], 16),
-                parseInt(m[3], 16),
-                (m[4] !== undefined ? parseInt(m[4], 16) : 255)];
-            
-        } else if ((m = DEC_COLOR_RE.exec(str)) !== null) {
-
-            r = [parseInt(m[1]),
-                parseInt(m[2]),
-                parseInt(m[3]),
-                255];
-            
-        } else if ((m = DEC_COLORA_RE.exec(str)) !== null) {
-
-            r = [parseInt(m[1]),
-                parseInt(m[2]),
-                parseInt(m[3]),
-                parseInt(m[4])];
-            
-        }
+/* Documents the error handler interface */
 
-        return r;
-    };
+/**
+ * @classdesc Generic interface for handling events. The interface exposes four
+ * methods:
+ * * <pre>info</pre>: unusual event that does not result in an inconsistent state
+ * * <pre>warn</pre>: unexpected event that should not result in an inconsistent state
+ * * <pre>error</pre>: unexpected event that may result in an inconsistent state
+ * * <pre>fatal</pre>: unexpected event that results in an inconsistent state
+ *   and termination of processing
+ * Each method takes a single <pre>string</pre> describing the event as argument,
+ * and returns a single <pre>boolean</pre>, which terminates processing if <pre>true</pre>.
+ *
+ * @name ErrorHandler
+ * @class
+ */
 
-    var LENGTH_RE = /^((?:\+|\-)?\d*(?:\.\d+)?)(px|em|c|%|rh|rw)$/;
 
-    imscUtils.parseLength = function (str) {
+/*
+ * Parses a TTML color expression
+ * 
+ */
 
-        var m;
+var HEX_COLOR_RE = /#([0-9a-fA-F]{2})([0-9a-fA-F]{2})([0-9a-fA-F]{2})([0-9a-fA-F]{2})?/;
+var DEC_COLOR_RE = /rgb\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)/;
+var DEC_COLORA_RE = /rgba\(\s*(\d+),\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)/;
+var NAMED_COLOR = {
+    transparent: [0, 0, 0, 0],
+    black: [0, 0, 0, 255],
+    silver: [192, 192, 192, 255],
+    gray: [128, 128, 128, 255],
+    white: [255, 255, 255, 255],
+    maroon: [128, 0, 0, 255],
+    red: [255, 0, 0, 255],
+    purple: [128, 0, 128, 255],
+    fuchsia: [255, 0, 255, 255],
+    magenta: [255, 0, 255, 255],
+    green: [0, 128, 0, 255],
+    lime: [0, 255, 0, 255],
+    olive: [128, 128, 0, 255],
+    yellow: [255, 255, 0, 255],
+    navy: [0, 0, 128, 255],
+    blue: [0, 0, 255, 255],
+    teal: [0, 128, 128, 255],
+    aqua: [0, 255, 255, 255],
+    cyan: [0, 255, 255, 255]
+};
 
-        var r = null;
+export function parseColor(str) {
 
-        if ((m = LENGTH_RE.exec(str)) !== null) {
+    var m;
 
-            r = {value: parseFloat(m[1]), unit: m[2]};
-        }
+    var r = null;
 
-        return r;
-    };
+    var nc = NAMED_COLOR[str.toLowerCase()];
+
+    if (nc !== undefined) {
+
+        r = nc;
+
+    } else if ((m = HEX_COLOR_RE.exec(str)) !== null) {
+
+        r = [parseInt(m[1], 16),
+        parseInt(m[2], 16),
+        parseInt(m[3], 16),
+        (m[4] !== undefined ? parseInt(m[4], 16) : 255)];
+
+    } else if ((m = DEC_COLOR_RE.exec(str)) !== null) {
+
+        r = [parseInt(m[1]),
+        parseInt(m[2]),
+        parseInt(m[3]),
+            255];
 
-    imscUtils.parseTextShadow = function (str) {
+    } else if ((m = DEC_COLORA_RE.exec(str)) !== null) {
 
-        var shadows = str.match(/([^\(,\)]|\([^\)]+\))+/g);
-        
-        var r = [];
+        r = [parseInt(m[1]),
+        parseInt(m[2]),
+        parseInt(m[3]),
+        parseInt(m[4])];
 
-        for (var i = 0; i < shadows.length; i++) {
+    }
 
-            var shadow = shadows[i].split(" ");
+    return r;
+};
 
-            if (shadow.length === 1 && shadow[0] === "none") {
+var LENGTH_RE = /^((?:\+|\-)?\d*(?:\.\d+)?)(px|em|c|%|rh|rw)$/;
 
-                return "none";
+export function parseLength(str) {
 
-            } else if (shadow.length > 1 && shadow.length < 5) {
+    var m;
 
-                var out_shadow = [null, null, null, null];
+    var r = null;
 
-                /* x offset */
+    if ((m = LENGTH_RE.exec(str)) !== null) {
 
-                var l = imscUtils.parseLength(shadow.shift());
+        r = { value: parseFloat(m[1]), unit: m[2] };
+    }
 
-                if (l === null)
-                    return null;
+    return r;
+};
 
-                out_shadow[0] = l;
+export function parseTextShadow(str) {
 
-                /* y offset */
+    var shadows = str.match(/([^\(,\)]|\([^\)]+\))+/g);
 
-                l = imscUtils.parseLength(shadow.shift());
+    var r = [];
 
-                if (l === null)
-                    return null;
+    for (var i = 0; i < shadows.length; i++) {
 
-                out_shadow[1] = l;
+        var shadow = shadows[i].split(" ");
 
-                /* is there a third component */
+        if (shadow.length === 1 && shadow[0] === "none") {
 
-                if (shadow.length === 0) {
-                    r.push(out_shadow);
-                    continue;
-                }
+            return "none";
 
-                l = imscUtils.parseLength(shadow[0]);
+        } else if (shadow.length > 1 && shadow.length < 5) {
 
-                if (l !== null) {
+            var out_shadow = [null, null, null, null];
 
-                    out_shadow[2] = l;
+            /* x offset */
 
-                    shadow.shift();
+            var l = parseLength(shadow.shift());
 
-                }
+            if (l === null)
+                return null;
+
+            out_shadow[0] = l;
 
-                if (shadow.length === 0) {
-                    r.push(out_shadow);
-                    continue;
-                }
+            /* y offset */
 
-                var c = imscUtils.parseColor(shadow[0]);
+            l = parseLength(shadow.shift());
+
+            if (l === null)
+                return null;
 
-                if (c === null)
-                    return null;
+            out_shadow[1] = l;
 
-                out_shadow[3] = c;
+            /* is there a third component */
 
+            if (shadow.length === 0) {
                 r.push(out_shadow);
+                continue;
             }
 
-        }
+            l = parseLength(shadow[0]);
 
-        return r;
-    };
+            if (l !== null) {
 
+                out_shadow[2] = l;
 
-    imscUtils.parsePosition = function (str) {
+                shadow.shift();
 
-        /* see https://www.w3.org/TR/ttml2/#style-value-position */
+            }
 
-        var s = str.split(" ");
+            if (shadow.length === 0) {
+                r.push(out_shadow);
+                continue;
+            }
 
-        var isKeyword = function (str) {
+            var c = parseColor(shadow[0]);
 
-            return str === "center" ||
-                    str === "left" ||
-                    str === "top" ||
-                    str === "bottom" ||
-                    str === "right";
+            if (c === null)
+                return null;
 
-        };
+            out_shadow[3] = c;
 
-        if (s.length > 4) {
+            r.push(out_shadow);
+        }
 
-            return null;
+    }
 
-        }
+    return r;
+};
 
-        /* initial clean-up pass */
 
-        for (var j = 0 ; j < s.length; j++) {
+export function parsePosition(str) {
 
-            if (!isKeyword(s[j])) {
+    /* see https://www.w3.org/TR/ttml2/#style-value-position */
 
-                var l = imscUtils.parseLength(s[j]);
+    var s = str.split(" ");
 
-                if (l === null)
-                    return null;
+    var isKeyword = function (str) {
 
-                s[j] = l;
-            }
+        return str === "center" ||
+            str === "left" ||
+            str === "top" ||
+            str === "bottom" ||
+            str === "right";
 
-        }
+    };
+
+    if (s.length > 4) {
 
-        /* position default */
+        return null;
 
-        var pos = {
-            h: {edge: "left", offset: {value: 50, unit: "%"}},
-            v: {edge: "top", offset: {value: 50, unit: "%"}}
-        };
+    }
 
-        /* update position */
+    /* initial clean-up pass */
 
-        for (var i = 0; i < s.length; ) {
+    for (var j = 0; j < s.length; j++) {
 
-            /* extract the current component */
+        if (!isKeyword(s[j])) {
 
-            var comp = s[i++];
+            var l = parseLength(s[j]);
+
+            if (l === null)
+                return null;
 
-            if (isKeyword(comp)) {
+            s[j] = l;
+        }
 
-                /* we have a keyword */
+    }
 
-                var offset = {value: 0, unit: "%"};
+    /* position default */
 
-                /* peek at the next component */
+    var pos = {
+        h: { edge: "left", offset: { value: 50, unit: "%" } },
+        v: { edge: "top", offset: { value: 50, unit: "%" } }
+    };
 
-                if (s.length !== 2 && i < s.length && (!isKeyword(s[i]))) {
+    /* update position */
 
-                    /* followed by an offset */
+    for (var i = 0; i < s.length;) {
 
-                    offset = s[i++];
+        /* extract the current component */
 
-                }
+        var comp = s[i++];
 
-                /* skip if center */
+        if (isKeyword(comp)) {
 
-                if (comp === "right") {
+            /* we have a keyword */
 
-                    pos.h.edge = comp;
+            var offset = { value: 0, unit: "%" };
 
-                    pos.h.offset = offset;
+            /* peek at the next component */
 
-                } else if (comp === "bottom") {
+            if (s.length !== 2 && i < s.length && (!isKeyword(s[i]))) {
 
-                    pos.v.edge = comp;
+                /* followed by an offset */
 
+                offset = s[i++];
 
-                    pos.v.offset = offset;
+            }
 
+            /* skip if center */
 
-                } else if (comp === "left") {
+            if (comp === "right") {
 
-                    pos.h.offset = offset;
+                pos.h.edge = comp;
 
+                pos.h.offset = offset;
 
-                } else if (comp === "top") {
+            } else if (comp === "bottom") {
 
-                    pos.v.offset = offset;
+                pos.v.edge = comp;
 
 
-                }
+                pos.v.offset = offset;
 
-            } else if (s.length === 1 || s.length === 2) {
 
-                /* we have a bare value */
+            } else if (comp === "left") {
 
-                if (i === 1) {
+                pos.h.offset = offset;
 
-                    /* assign it to left edge if first bare value */
 
-                    pos.h.offset = comp;
+            } else if (comp === "top") {
 
-                } else {
+                pos.v.offset = offset;
 
-                    /* assign it to top edge if second bare value */
 
-                    pos.v.offset = comp;
+            }
 
-                }
+        } else if (s.length === 1 || s.length === 2) {
+
+            /* we have a bare value */
+
+            if (i === 1) {
+
+                /* assign it to left edge if first bare value */
+
+                pos.h.offset = comp;
 
             } else {
 
-                /* error condition */
+                /* assign it to top edge if second bare value */
 
-                return null;
+                pos.v.offset = comp;
 
             }
 
+        } else {
+
+            /* error condition */
+
+            return null;
+
         }
 
-        return pos;
-    };
+    }
 
+    return pos;
+};
 
-    imscUtils.ComputedLength = function (rw, rh) {
+
+export class ComputedLength {
+    constructor(rw, rh) {
         this.rw = rw;
         this.rh = rh;
-    };
+    }
 
-    imscUtils.ComputedLength.prototype.toUsedLength = function (width, height) {
+    toUsedLength(width, height) {
         return width * this.rw + height * this.rh;
     };
 
-    imscUtils.ComputedLength.prototype.isZero = function () {
+    isZero() {
         return this.rw === 0 && this.rh === 0;
     };
 
-    /**
-     * Computes a specified length to a root container relative length
-     * 
-     * @param {number} lengthVal Length value to be computed
-     * @param {string} lengthUnit Units of the length value
-     * @param {number} emScale length of 1em, or null if em is not allowed
-     * @param {number} percentScale length to which , or null if perecentage is not allowed
-     * @param {number} cellScale length of 1c, or null if c is not allowed
-     * @param {number} pxScale length of 1px, or null if px is not allowed
-     * @param {number} direction 0 if the length is computed in the horizontal direction, 1 if the length is computed in the vertical direction
-     * @return {number} Computed length
-     */
-    imscUtils.toComputedLength = function(lengthVal, lengthUnit, emLength, percentLength, cellLength, pxLength) {
-
-        if (lengthUnit === "%" && percentLength) {
+}
 
-            return new imscUtils.ComputedLength(
-                    percentLength.rw * lengthVal / 100,
-                    percentLength.rh * lengthVal / 100
-                    );
+/**
+ * Computes a specified length to a root container relative length
+ * 
+ * @param {number} lengthVal Length value to be computed
+ * @param {string} lengthUnit Units of the length value
+ * @param {number} emScale length of 1em, or null if em is not allowed
+ * @param {number} percentScale length to which , or null if perecentage is not allowed
+ * @param {number} cellScale length of 1c, or null if c is not allowed
+ * @param {number} pxScale length of 1px, or null if px is not allowed
+ * @param {number} direction 0 if the length is computed in the horizontal direction, 1 if the length is computed in the vertical direction
+ * @return {number} Computed length
+ */
+export function toComputedLength(lengthVal, lengthUnit, emLength, percentLength, cellLength, pxLength) {
 
-        } else if (lengthUnit === "em" && emLength) {
+    if (lengthUnit === "%" && percentLength) {
 
-            return new imscUtils.ComputedLength(
-                    emLength.rw * lengthVal,
-                    emLength.rh * lengthVal
-                    );
+        return new ComputedLength(
+            percentLength.rw * lengthVal / 100,
+            percentLength.rh * lengthVal / 100
+        );
 
-        } else if (lengthUnit === "c" && cellLength) {
+    } else if (lengthUnit === "em" && emLength) {
 
-            return new imscUtils.ComputedLength(
-                    lengthVal * cellLength.rw,
-                    lengthVal * cellLength.rh
-                    );
+        return new ComputedLength(
+            emLength.rw * lengthVal,
+            emLength.rh * lengthVal
+        );
 
-        } else if (lengthUnit === "px" && pxLength) {
+    } else if (lengthUnit === "c" && cellLength) {
 
-            return new imscUtils.ComputedLength(
-                    lengthVal * pxLength.rw,
-                    lengthVal * pxLength.rh
-                    );
+        return new ComputedLength(
+            lengthVal * cellLength.rw,
+            lengthVal * cellLength.rh
+        );
 
-        } else if (lengthUnit === "rh") {
+    } else if (lengthUnit === "px" && pxLength) {
 
-            return new imscUtils.ComputedLength(
-                    0,
-                    lengthVal / 100
-                    );
+        return new ComputedLength(
+            lengthVal * pxLength.rw,
+            lengthVal * pxLength.rh
+        );
 
-        } else if (lengthUnit === "rw") {
+    } else if (lengthUnit === "rh") {
 
-            return new imscUtils.ComputedLength(
-                    lengthVal / 100,
-                    0                    
-                    );
+        return new ComputedLength(
+            0,
+            lengthVal / 100
+        );
 
-        } else {
+    } else if (lengthUnit === "rw") {
 
-            return null;
+        return new ComputedLength(
+            lengthVal / 100,
+            0
+        );
 
-        }
-
-    };
+    } else {
 
+        return null;
 
+    }
 
-})(typeof exports === 'undefined' ? this.imscUtils = {} : exports);
+};

From 00d8dee68e2f39fdc6672d7f6dbe0d3ad1658829 Mon Sep 17 00:00:00 2001
From: Casey Occhialini <1508707+littlespex@users.noreply.github.com>
Date: Fri, 26 Apr 2024 22:46:43 -0700
Subject: [PATCH 02/21] fix: convert to ES6 let/const

---
 src/main/js/doc.js                 | 413 +++++++-------
 src/main/js/error.js               |   2 +-
 src/main/js/html.js                | 860 ++++++++++++++---------------
 src/main/js/isd.js                 | 283 +++++-----
 src/main/js/main.js                |   4 +-
 src/main/js/names.js               |  18 +-
 src/main/js/styles.js              | 491 ++++++++--------
 src/main/js/utils.js               | 122 ++--
 src/test/js/ParseColor.js          |  77 ++-
 src/test/js/ParsePositionTest.js   | 149 +++--
 src/test/js/ParseTextShadowTest.js |  31 +-
 11 files changed, 1201 insertions(+), 1249 deletions(-)

diff --git a/src/main/js/doc.js b/src/main/js/doc.js
index d2c76270..df585195 100644
--- a/src/main/js/doc.js
+++ b/src/main/js/doc.js
@@ -1,4 +1,4 @@
-/* 
+/*
  * Copyright (c) 2016, Pierre-Anthony Lemieux <pal@sandflow.com>
  * All rights reserved.
  *
@@ -26,15 +26,14 @@
 
 import sax from 'sax';
 import { reportError, reportFatal, reportWarning } from './error.js';
-import { ns_ebutts, ns_ittp, ns_itts, ns_tt, ns_ttp } from './names.js';
+import { ns_ebutts, ns_ittp, ns_itts, ns_tt, ns_ttp, ns_tts } from './names.js';
 import { byName, byQName } from './styles.js';
-import { ComputedLength, parseLength } from './utils.js';
+import { ComputedLength, hasOwnProperty, parseLength } from './utils.js';
 
 /**
  * @module imscDoc
  */
 
-
 /**
  * Allows a client to provide callbacks to handle children of the <metadata> element
  * @typedef {Object} MetadataHandler
@@ -68,24 +67,23 @@ import { ComputedLength, parseLength } from './utils.js';
  * a single method <pre>getMediaTimeEvents()</pre> that returns a list of time
  * offsets (in seconds) of the ISD, i.e. the points in time where the visual
  * representation of the document change. `metadataHandler` allows the caller to
- * be called back when nodes are present in <metadata> elements. 
- * 
+ * be called back when nodes are present in <metadata> elements.
+ *
  * @param {string} xmlstring XML document
  * @param {?module:imscUtils.ErrorHandler} errorHandler Error callback
  * @param {?MetadataHandler} metadataHandler Callback for <Metadata> elements
  * @returns {Object} Opaque in-memory representation of an IMSC1 document
  */
 
-export function fromXM(xmlstring, errorHandler, metadataHandler) {
-    var p = sax.parser(true, { xmlns: true });
-    var estack = [];
-    var xmllangstack = [];
-    var xmlspacestack = [];
-    var metadata_depth = 0;
-    var doc = null;
-
-    p.onclosetag = function (node) {
+export function fromXML(xmlstring, errorHandler, metadataHandler) {
+    const p = sax.parser(true, { xmlns: true });
+    const estack = [];
+    const xmllangstack = [];
+    const xmlspacestack = [];
+    let metadata_depth = 0;
+    let doc = null;
 
+    p.onclosetag = function () {
 
         if (estack[0] instanceof Region) {
 
@@ -101,9 +99,9 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
 
             /* flatten chained referential styling */
 
-            for (var sid in estack[0].styles) {
+            for (const sid in estack[0].styles) {
 
-                if (!estack[0].styles.hasOwnProperty(sid)) continue;
+                if (!hasOwnProperty(estack[0].styles, sid)) continue;
 
                 mergeChainedStyles(estack[0], estack[0].styles[sid], errorHandler);
 
@@ -115,9 +113,9 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
 
             if (estack[0].contents.length > 1) {
 
-                var cs = [estack[0].contents[0]];
+                const cs = [estack[0].contents[0]];
 
-                var c;
+                let c;
 
                 for (c = 1; c < estack[0].contents.length; c++) {
 
@@ -197,7 +195,7 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
 
             if (estack[0] instanceof Span) {
 
-                var ruby = estack[0].styleAttrs[byName.ruby.qname];
+                const ruby = estack[0].styleAttrs[byName.ruby.qname];
 
                 if (ruby === 'container' || ruby === 'textContainer' || ruby === 'baseContainer') {
 
@@ -209,7 +207,7 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
 
             /* create an anonymous span */
 
-            var s = new AnonymousSpan();
+            const s = new AnonymousSpan();
 
             s.initFromText(doc, estack[0], str, xmllangstack[0], xmlspacestack[0], errorHandler);
 
@@ -228,12 +226,11 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
 
     };
 
-
     p.onopentag = function (node) {
 
         // maintain the xml:space stack
 
-        var xmlspace = node.attributes["xml:space"];
+        const xmlspace = node.attributes['xml:space'];
 
         if (xmlspace) {
 
@@ -243,7 +240,7 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
 
             if (xmlspacestack.length === 0) {
 
-                xmlspacestack.unshift("default");
+                xmlspacestack.unshift('default');
 
             } else {
 
@@ -255,8 +252,7 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
 
         /* maintain the xml:lang stack */
 
-
-        var xmllang = node.attributes["xml:lang"];
+        const xmllang = node.attributes['xml:lang'];
 
         if (xmllang) {
 
@@ -266,7 +262,7 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
 
             if (xmllangstack.length === 0) {
 
-                xmllangstack.unshift("");
+                xmllangstack.unshift('');
 
             } else {
 
@@ -276,7 +272,6 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
 
         }
 
-
         /* process the element */
 
         if (node.uri === ns_tt) {
@@ -285,7 +280,7 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
 
                 if (doc !== null) {
 
-                    reportFatal(errorHandler, "Two <tt> elements at (" + this.line + "," + this.column + ")");
+                    reportFatal(errorHandler, 'Two <tt> elements at (' + this.line + ',' + this.column + ')');
 
                 }
 
@@ -298,7 +293,7 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
             } else if (node.local === 'head') {
 
                 if (!(estack[0] instanceof TT)) {
-                    reportFatal(errorHandler, "Parent of <head> element is not <tt> at (" + this.line + "," + this.column + ")");
+                    reportFatal(errorHandler, 'Parent of <head> element is not <tt> at (' + this.line + ',' + this.column + ')');
                 }
 
                 estack.unshift(doc.head);
@@ -306,14 +301,14 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
             } else if (node.local === 'styling') {
 
                 if (!(estack[0] instanceof Head)) {
-                    reportFatal(errorHandler, "Parent of <styling> element is not <head> at (" + this.line + "," + this.column + ")");
+                    reportFatal(errorHandler, 'Parent of <styling> element is not <head> at (' + this.line + ',' + this.column + ')');
                 }
 
                 estack.unshift(doc.head.styling);
 
             } else if (node.local === 'style') {
 
-                var s;
+                let s;
 
                 if (estack[0] instanceof Styling) {
 
@@ -325,7 +320,7 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
 
                     if (!s.id) {
 
-                        reportError(errorHandler, "<style> element missing @id attribute");
+                        reportError(errorHandler, '<style> element missing @id attribute');
 
                     } else {
 
@@ -352,13 +347,13 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
 
                 } else {
 
-                    reportFatal(errorHandler, "Parent of <style> element is not <styling> or <region> at (" + this.line + "," + this.column + ")");
+                    reportFatal(errorHandler, 'Parent of <style> element is not <styling> or <region> at (' + this.line + ',' + this.column + ')');
 
                 }
 
             } else if (node.local === 'initial') {
 
-                var ini;
+                let ini;
 
                 if (estack[0] instanceof Styling) {
 
@@ -366,9 +361,9 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
 
                     ini.initFromNode(node, errorHandler);
 
-                    for (var qn in ini.styleAttrs) {
+                    for (const qn in ini.styleAttrs) {
 
-                        if (!ini.styleAttrs.hasOwnProperty(qn)) continue;
+                        if (!hasOwnProperty(ini.styleAttrs, qn)) continue;
 
                         doc.head.styling.initials[qn] = ini.styleAttrs[qn];
 
@@ -378,7 +373,7 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
 
                 } else {
 
-                    reportFatal(errorHandler, "Parent of <initial> element is not <styling> at (" + this.line + "," + this.column + ")");
+                    reportFatal(errorHandler, 'Parent of <initial> element is not <styling> at (' + this.line + ',' + this.column + ')');
 
                 }
 
@@ -386,7 +381,7 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
 
                 if (!(estack[0] instanceof Head)) {
 
-                    reportFatal(errorHandler, "Parent of <layout> element is not <head> at " + this.line + "," + this.column + ")");
+                    reportFatal(errorHandler, 'Parent of <layout> element is not <head> at ' + this.line + ',' + this.column + ')');
 
                 }
 
@@ -395,16 +390,16 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
             } else if (node.local === 'region') {
 
                 if (!(estack[0] instanceof Layout)) {
-                    reportFatal(errorHandler, "Parent of <region> element is not <layout> at " + this.line + "," + this.column + ")");
+                    reportFatal(errorHandler, 'Parent of <region> element is not <layout> at ' + this.line + ',' + this.column + ')');
                 }
 
-                var r = new Region();
+                const r = new Region();
 
                 r.initFromNode(doc, node, xmllangstack[0], errorHandler);
 
                 if (!r.id || r.id in doc.head.layout.regions) {
 
-                    reportError(errorHandler, "Ignoring <region> with duplicate or missing @id at " + this.line + "," + this.column + ")");
+                    reportError(errorHandler, 'Ignoring <region> with duplicate or missing @id at ' + this.line + ',' + this.column + ')');
 
                 } else {
 
@@ -418,17 +413,17 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
 
                 if (!(estack[0] instanceof TT)) {
 
-                    reportFatal(errorHandler, "Parent of <body> element is not <tt> at " + this.line + "," + this.column + ")");
+                    reportFatal(errorHandler, 'Parent of <body> element is not <tt> at ' + this.line + ',' + this.column + ')');
 
                 }
 
                 if (doc.body !== null) {
 
-                    reportFatal(errorHandler, "Second <body> element at " + this.line + "," + this.column + ")");
+                    reportFatal(errorHandler, 'Second <body> element at ' + this.line + ',' + this.column + ')');
 
                 }
 
-                var b = new Body();
+                const b = new Body();
 
                 b.initFromNode(doc, node, xmllangstack[0], errorHandler);
 
@@ -440,17 +435,17 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
 
                 if (!(estack[0] instanceof Div || estack[0] instanceof Body)) {
 
-                    reportFatal(errorHandler, "Parent of <div> element is not <body> or <div> at " + this.line + "," + this.column + ")");
+                    reportFatal(errorHandler, 'Parent of <div> element is not <body> or <div> at ' + this.line + ',' + this.column + ')');
 
                 }
 
-                var d = new Div();
+                const d = new Div();
 
                 d.initFromNode(doc, estack[0], node, xmllangstack[0], errorHandler);
 
                 /* transform smpte:backgroundImage to TTML2 image element */
 
-                var bi = d.styleAttrs[byName.backgroundImage.qname];
+                const bi = d.styleAttrs[byName.backgroundImage.qname];
 
                 if (bi) {
                     d.contents.push(new Image(bi));
@@ -465,11 +460,11 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
 
                 if (!(estack[0] instanceof Div)) {
 
-                    reportFatal(errorHandler, "Parent of <image> element is not <div> at " + this.line + "," + this.column + ")");
+                    reportFatal(errorHandler, 'Parent of <image> element is not <div> at ' + this.line + ',' + this.column + ')');
 
                 }
 
-                var img = new Image();
+                const img = new Image();
 
                 img.initFromNode(doc, estack[0], node, xmllangstack[0], errorHandler);
 
@@ -481,11 +476,11 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
 
                 if (!(estack[0] instanceof Div)) {
 
-                    reportFatal(errorHandler, "Parent of <p> element is not <div> at " + this.line + "," + this.column + ")");
+                    reportFatal(errorHandler, 'Parent of <p> element is not <div> at ' + this.line + ',' + this.column + ')');
 
                 }
 
-                var p = new P();
+                const p = new P();
 
                 p.initFromNode(doc, estack[0], node, xmllangstack[0], errorHandler);
 
@@ -497,11 +492,11 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
 
                 if (!(estack[0] instanceof Span || estack[0] instanceof P)) {
 
-                    reportFatal(errorHandler, "Parent of <span> element is not <span> or <p> at " + this.line + "," + this.column + ")");
+                    reportFatal(errorHandler, 'Parent of <span> element is not <span> or <p> at ' + this.line + ',' + this.column + ')');
 
                 }
 
-                var ns = new Span();
+                const ns = new Span();
 
                 ns.initFromNode(doc, estack[0], node, xmllangstack[0], xmlspacestack[0], errorHandler);
 
@@ -513,11 +508,11 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
 
                 if (!(estack[0] instanceof Span || estack[0] instanceof P)) {
 
-                    reportFatal(errorHandler, "Parent of <br> element is not <span> or <p> at " + this.line + "," + this.column + ")");
+                    reportFatal(errorHandler, 'Parent of <br> element is not <span> or <p> at ' + this.line + ',' + this.column + ')');
 
                 }
 
-                var nb = new Br();
+                const nb = new Br();
 
                 nb.initFromNode(doc, estack[0], node, xmllangstack[0], errorHandler);
 
@@ -534,11 +529,11 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
                     estack[0] instanceof Region ||
                     estack[0] instanceof Br)) {
 
-                    reportFatal(errorHandler, "Parent of <set> element is not a content element or a region at " + this.line + "," + this.column + ")");
+                    reportFatal(errorHandler, 'Parent of <set> element is not a content element or a region at ' + this.line + ',' + this.column + ')');
 
                 }
 
-                var st = new Set();
+                const st = new Set();
 
                 st.initFromNode(doc, estack[0], node, errorHandler);
 
@@ -580,14 +575,14 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
 
                 /* start of child of metadata element */
 
-                var attrs = [];
+                const attrs = [];
 
-                for (var a in node.attributes) {
-                    attrs[node.attributes[a].uri + " " + node.attributes[a].local] =
+                for (const a in node.attributes) {
+                    attrs[node.attributes[a].uri + ' ' + node.attributes[a].local] =
                     {
                         uri: node.attributes[a].uri,
                         local: node.attributes[a].local,
-                        value: node.attributes[a].value
+                        value: node.attributes[a].value,
                     };
                 }
 
@@ -609,13 +604,14 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
 
     // create default region if no regions specified
 
-    var hasRegions = false;
+    const regions = doc.head.layout.regions;
+    let hasRegions = false;
 
     /* AFAIK the only way to determine whether an object has members */
 
-    for (var i in doc.head.layout.regions) {
+    for (const i in regions) {
 
-        if (doc.head.layout.regions.hasOwnProperty(i)) {
+        if (hasOwnProperty(regions, i)) {
             hasRegions = true;
             break;
         }
@@ -626,19 +622,19 @@ export function fromXM(xmlstring, errorHandler, metadataHandler) {
 
         /* create default region */
 
-        var dr = Region.createDefaultRegion(doc.lang);
+        const dr = Region.createDefaultRegion(doc.lang);
 
-        doc.head.layout.regions[dr.id] = dr;
+        regions[dr.id] = dr;
 
     }
 
     /* resolve desired timing for regions */
 
-    for (var region_i in doc.head.layout.regions) {
+    for (const region_i in regions) {
 
-        if (!doc.head.layout.regions.hasOwnProperty(region_i)) continue;
+        if (!hasOwnProperty(regions, region_i)) continue;
 
-        resolveTiming(doc, doc.head.layout.regions[region_i], null, null);
+        resolveTiming(doc, regions[region_i], null, null);
 
     }
 
@@ -661,11 +657,11 @@ function cleanRubyContainers(element) {
 
     if (!('contents' in element)) return;
 
-    var rubyval = 'styleAttrs' in element ? element.styleAttrs[byName.ruby.qname] : null;
+    const rubyval = 'styleAttrs' in element ? element.styleAttrs[byName.ruby.qname] : null;
 
-    var isrubycontainer = (element.kind === 'span' && (rubyval === "container" || rubyval === "textContainer" || rubyval === "baseContainer"));
+    const isrubycontainer = (element.kind === 'span' && (rubyval === 'container' || rubyval === 'textContainer' || rubyval === 'baseContainer'));
 
-    for (var i = element.contents.length - 1; i >= 0; i--) {
+    for (let i = element.contents.length - 1; i >= 0; i--) {
 
         if (isrubycontainer && !('styleAttrs' in element.contents[i] && byName.ruby.qname in element.contents[i].styleAttrs)) {
 
@@ -687,11 +683,11 @@ function resolveTiming(doc, element, prev_sibling, parent) {
 
     /* are we in a seq container? */
 
-    var isinseq = parent && parent.timeContainer === "seq";
+    const isinseq = parent && parent.timeContainer === 'seq';
 
     /* determine implicit begin */
 
-    var implicit_begin = 0; /* default */
+    let implicit_begin = 0; /* default */
 
     if (parent) {
 
@@ -703,7 +699,6 @@ function resolveTiming(doc, element, prev_sibling, parent) {
 
             implicit_begin = prev_sibling.end;
 
-
         } else {
 
             implicit_begin = parent.begin;
@@ -716,20 +711,19 @@ function resolveTiming(doc, element, prev_sibling, parent) {
 
     element.begin = element.explicit_begin ? element.explicit_begin + implicit_begin : implicit_begin;
 
-
     /* determine implicit end */
 
-    var implicit_end = element.begin;
+    let implicit_end = element.begin;
 
-    var s = null;
+    let s = null;
 
-    if ("sets" in element) {
+    if ('sets' in element) {
 
-        for (var set_i = 0; set_i < element.sets.length; set_i++) {
+        for (let set_i = 0; set_i < element.sets.length; set_i++) {
 
             resolveTiming(doc, element.sets[set_i], s, element);
 
-            if (element.timeContainer === "seq") {
+            if (element.timeContainer === 'seq') {
 
                 implicit_end = element.sets[set_i].end;
 
@@ -763,13 +757,13 @@ function resolveTiming(doc, element, prev_sibling, parent) {
 
         }
 
-    } else if ("contents" in element) {
+    } else if ('contents' in element) {
 
-        for (var content_i = 0; content_i < element.contents.length; content_i++) {
+        for (let content_i = 0; content_i < element.contents.length; content_i++) {
 
             resolveTiming(doc, element.contents[content_i], s, element);
 
-            if (element.timeContainer === "seq") {
+            if (element.timeContainer === 'seq') {
 
                 implicit_end = element.contents[content_i].end;
 
@@ -830,16 +824,16 @@ class TT {
 
         /* compute cell resolution */
 
-        var cr = extractCellResolution(node, errorHandler);
+        const cr = extractCellResolution(node, errorHandler);
 
         this.cellLength = {
             'h': new ComputedLength(0, 1 / cr.h),
-            'w': new ComputedLength(1 / cr.w, 0)
+            'w': new ComputedLength(1 / cr.w, 0),
         };
 
         /* extract frame rate and tick rate */
 
-        var frtr = extractFrameAndTickRate(node, errorHandler);
+        const frtr = extractFrameAndTickRate(node, errorHandler);
 
         this.effectiveFrameRate = frtr.effectiveFrameRate;
 
@@ -851,34 +845,34 @@ class TT {
 
         /* check timebase */
 
-        var attr = findAttribute(node, ns_ttp, "timeBase");
+        const attr = findAttribute(node, ns_ttp, 'timeBase');
 
-        if (attr !== null && attr !== "media") {
+        if (attr !== null && attr !== 'media') {
 
-            reportFatal(errorHandler, "Unsupported time base");
+            reportFatal(errorHandler, 'Unsupported time base');
 
         }
 
         /* retrieve extent */
 
-        var e = extractExtent(node, errorHandler);
+        const e = extractExtent(node, errorHandler);
 
         if (e === null) {
 
             this.pxLength = {
                 'h': null,
-                'w': null
+                'w': null,
             };
 
         } else {
 
-            if (e.h.unit !== "px" || e.w.unit !== "px") {
-                reportFatal(errorHandler, "Extent on TT must be in px or absent");
+            if (e.h.unit !== 'px' || e.w.unit !== 'px') {
+                reportFatal(errorHandler, 'Extent on TT must be in px or absent');
             }
 
             this.pxLength = {
                 'h': new ComputedLength(0, 1 / e.h.value),
-                'w': new ComputedLength(1 / e.w.value, 0)
+                'w': new ComputedLength(1 / e.w.value, 0),
             };
         }
 
@@ -888,7 +882,7 @@ class TT {
 
         this.dimensions = {
             'h': new ComputedLength(0, 1),
-            'w': new ComputedLength(1, 0)
+            'w': new ComputedLength(1, 0),
 
         };
 
@@ -908,7 +902,7 @@ class TT {
 
         /* index the begin time of the event */
 
-        var b_i = indexOf(this.events, elem.begin);
+        const b_i = indexOf(this.events, elem.begin);
 
         if (!b_i.found) {
             this.events.splice(b_i.index, 0, elem.begin);
@@ -918,7 +912,7 @@ class TT {
 
         if (elem.end !== Number.POSITIVE_INFINITY) {
 
-            var e_i = indexOf(this.events, elem.end);
+            const e_i = indexOf(this.events, elem.end);
 
             if (!e_i.found) {
                 this.events.splice(e_i.index, 0, elem.end);
@@ -930,9 +924,9 @@ class TT {
 
     /*
      * Retrieves the range of ISD times covered by the document
-     * 
+     *
      * @returns {Array} Array of two elements: min_begin_time and max_begin_time
-     * 
+     *
      */
     getMediaTimeRange() {
 
@@ -940,8 +934,8 @@ class TT {
     };
 
     /*
-     * Returns list of ISD begin times  
-     * 
+     * Returns list of ISD begin times
+     *
      * @returns {Array}
      */
     getMediaTimeEvents() {
@@ -950,7 +944,6 @@ class TT {
     };
 }
 
-
 /*
  * Represents a TTML Head element
  */
@@ -1000,17 +993,17 @@ class Initial {
         this.styleAttrs = null;
     }
 
-    initFromNode(node, errorHandler) {
+    initFromNode(node) {
 
         this.styleAttrs = {};
 
-        for (var i in node.attributes) {
+        for (const i in node.attributes) {
 
             if (node.attributes[i].uri === ns_itts ||
                 node.attributes[i].uri === ns_ebutts ||
                 node.attributes[i].uri === ns_tts) {
 
-                var qname = node.attributes[i].uri + " " + node.attributes[i].local;
+                const qname = node.attributes[i].uri + ' ' + node.attributes[i].local;
 
                 this.styleAttrs[qname] = node.attributes[i].value;
 
@@ -1022,7 +1015,7 @@ class Initial {
 
 /*
  * Represents a TTML Layout element
- * 
+ *
  */
 
 class Layout {
@@ -1046,13 +1039,13 @@ class Image {
         this.src = 'src' in node.attributes ? node.attributes.src.value : null;
 
         if (!this.src) {
-            reportError(errorHandler, "Invalid image@src attribute");
+            reportError(errorHandler, 'Invalid image@src attribute');
         }
 
         this.type = 'type' in node.attributes ? node.attributes.type.value : null;
 
         if (!this.type) {
-            reportError(errorHandler, "Invalid image@type attribute");
+            reportError(errorHandler, 'Invalid image@type attribute');
         }
 
         StyledElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
@@ -1066,7 +1059,7 @@ class Image {
 
 /*
  * TTML element utility functions
- * 
+ *
  */
 
 class ContentElement {
@@ -1080,7 +1073,7 @@ class IdentifiedElement {
         this.id = id;
     }
 
-    initFromNode(doc, parent, node, errorHandler) {
+    initFromNode(doc, parent, node) {
         this.id = elementGetXMLID(node);
     }
 }
@@ -1090,7 +1083,7 @@ class LayoutElement {
         this.regionID = id;
     }
 
-    initFromNode(doc, parent, node, errorHandler) {
+    initFromNode(doc, parent, node) {
         this.regionID = elementGetRegionID(node);
     }
 }
@@ -1116,7 +1109,7 @@ class AnimatedElement {
         this.sets = sets;
     }
 
-    initFromNode(doc, parent, node, errorHandler) {
+    initFromNode() {
         this.sets = [];
     }
 }
@@ -1126,7 +1119,7 @@ class ContainerElement {
         this.contents = contents;
     }
 
-    initFromNode(doc, parent, node, errorHandler) {
+    initFromNode() {
         this.contents = [];
     }
 }
@@ -1139,7 +1132,7 @@ class TimedElement {
     }
 
     initFromNode(doc, parent, node, errorHandler) {
-        var t = processTiming(doc, parent, node, errorHandler);
+        const t = processTiming(doc, parent, node, errorHandler);
         this.explicit_begin = t.explicit_begin;
         this.explicit_end = t.explicit_end;
         this.explicit_dur = t.explicit_dur;
@@ -1148,19 +1141,15 @@ class TimedElement {
     }
 }
 
-
 /*
  * Represents a TTML body element
  */
 
-
-
 class Body {
     constructor() {
         ContentElement.call(this, 'body');
     }
 
-
     initFromNode(doc, node, xmllang, errorHandler) {
         StyledElement.prototype.initFromNode.call(this, doc, null, node, errorHandler);
         TimedElement.prototype.initFromNode.call(this, doc, null, node, errorHandler);
@@ -1270,7 +1259,7 @@ class Br {
 
 /*
  * Represents a TTML Region element
- * 
+ *
  */
 
 class Region {
@@ -1278,7 +1267,7 @@ class Region {
     }
 
     static createDefaultRegion(xmllang) {
-        var r = new Region();
+        const r = new Region();
 
         IdentifiedElement.call(r, '');
         StyledElement.call(r, {});
@@ -1309,10 +1298,9 @@ class Region {
     }
 }
 
-
 /*
  * Represents a TTML Set element
- * 
+ *
  */
 
 class Set {
@@ -1323,18 +1311,18 @@ class Set {
 
         TimedElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
 
-        var styles = elementGetStyles(node, errorHandler);
+        const styles = elementGetStyles(node, errorHandler);
 
         this.qname = null;
         this.value = null;
 
-        for (var qname in styles) {
+        for (const qname in styles) {
 
-            if (!styles.hasOwnProperty(qname)) continue;
+            if (!hasOwnProperty(styles, qname)) continue;
 
             if (this.qname) {
 
-                reportError(errorHandler, "More than one style specified on set");
+                reportError(errorHandler, 'More than one style specified on set');
                 break;
 
             }
@@ -1349,10 +1337,9 @@ class Set {
 
 /*
  * Utility functions
- * 
+ *
  */
 
-
 function elementGetXMLID(node) {
     return node && 'xml:id' in node.attributes ? node.attributes['xml:id'].value || null : null;
 }
@@ -1363,21 +1350,21 @@ function elementGetRegionID(node) {
 
 function elementGetTimeContainer(node, errorHandler) {
 
-    var tc = node && 'timeContainer' in node.attributes ? node.attributes.timeContainer.value : null;
+    const tc = node && 'timeContainer' in node.attributes ? node.attributes.timeContainer.value : null;
 
-    if ((!tc) || tc === "par") {
+    if ((!tc) || tc === 'par') {
 
-        return "par";
+        return 'par';
 
-    } else if (tc === "seq") {
+    } else if (tc === 'seq') {
 
-        return "seq";
+        return 'seq';
 
     } else {
 
         reportError(errorHandler, "Illegal value of timeContainer (assuming 'par')");
 
-        return "par";
+        return 'par';
 
     }
 
@@ -1385,25 +1372,25 @@ function elementGetTimeContainer(node, errorHandler) {
 
 function elementGetStyleRefs(node) {
 
-    return node && 'style' in node.attributes ? node.attributes.style.value.split(" ") : [];
+    return node && 'style' in node.attributes ? node.attributes.style.value.split(' ') : [];
 
 }
 
 function elementGetStyles(node, errorHandler) {
 
-    var s = {};
+    const s = {};
 
     if (node !== null) {
 
-        for (var i in node.attributes) {
+        for (const i in node.attributes) {
 
-            var qname = node.attributes[i].uri + " " + node.attributes[i].local;
+            const qname = node.attributes[i].uri + ' ' + node.attributes[i].local;
 
-            var sa = byQName[qname];
+            const sa = byQName[qname];
 
             if (sa !== undefined) {
 
-                var val = sa.parse(node.attributes[i].value);
+                const val = sa.parse(node.attributes[i].value);
 
                 if (val !== null) {
 
@@ -1412,12 +1399,12 @@ function elementGetStyles(node, errorHandler) {
                     /* TODO: consider refactoring errorHandler into parse and compute routines */
 
                     if (sa === byName.zIndex) {
-                        reportWarning(errorHandler, "zIndex attribute present but not used by IMSC1 since regions do not overlap");
+                        reportWarning(errorHandler, 'zIndex attribute present but not used by IMSC1 since regions do not overlap');
                     }
 
                 } else {
 
-                    reportError(errorHandler, "Cannot parse styling attribute " + qname + " --> " + node.attributes[i].value);
+                    reportError(errorHandler, 'Cannot parse styling attribute ' + qname + ' --> ' + node.attributes[i].value);
 
                 }
 
@@ -1431,7 +1418,7 @@ function elementGetStyles(node, errorHandler) {
 }
 
 function findAttribute(node, ns, name) {
-    for (var i in node.attributes) {
+    for (const i in node.attributes) {
 
         if (node.attributes[i].uri === ns &&
             node.attributes[i].local === name) {
@@ -1445,27 +1432,27 @@ function findAttribute(node, ns, name) {
 
 function extractAspectRatio(node, errorHandler) {
 
-    var ar = findAttribute(node, ns_ittp, "aspectRatio");
+    let ar = findAttribute(node, ns_ittp, 'aspectRatio');
 
     if (ar === null) {
 
-        ar = findAttribute(node, ns_ttp, "displayAspectRatio");
+        ar = findAttribute(node, ns_ttp, 'displayAspectRatio');
 
     }
 
-    var rslt = null;
+    let rslt = null;
 
     if (ar !== null) {
 
-        var ASPECT_RATIO_RE = /(\d+)\s+(\d+)/;
+        const ASPECT_RATIO_RE = /(\d+)\s+(\d+)/;
 
-        var m = ASPECT_RATIO_RE.exec(ar);
+        const m = ASPECT_RATIO_RE.exec(ar);
 
         if (m !== null) {
 
-            var w = parseInt(m[1]);
+            const w = parseInt(m[1]);
 
-            var h = parseInt(m[2]);
+            const h = parseInt(m[2]);
 
             if (w !== 0 && h !== 0) {
 
@@ -1473,12 +1460,12 @@ function extractAspectRatio(node, errorHandler) {
 
             } else {
 
-                reportError(errorHandler, "Illegal aspectRatio values (ignoring)");
+                reportError(errorHandler, 'Illegal aspectRatio values (ignoring)');
             }
 
         } else {
 
-            reportError(errorHandler, "Malformed aspectRatio attribute (ignoring)");
+            reportError(errorHandler, 'Malformed aspectRatio attribute (ignoring)');
         }
 
     }
@@ -1489,22 +1476,22 @@ function extractAspectRatio(node, errorHandler) {
 
 /*
  * Returns the cellResolution attribute from a node
- * 
+ *
  */
 function extractCellResolution(node, errorHandler) {
 
-    var cr = findAttribute(node, ns_ttp, "cellResolution");
+    const cr = findAttribute(node, ns_ttp, 'cellResolution');
 
     // initial value
 
-    var h = 15;
-    var w = 32;
+    let h = 15;
+    let w = 32;
 
     if (cr !== null) {
 
-        var CELL_RESOLUTION_RE = /(\d+) (\d+)/;
+        const CELL_RESOLUTION_RE = /(\d+) (\d+)/;
 
-        var m = CELL_RESOLUTION_RE.exec(cr);
+        const m = CELL_RESOLUTION_RE.exec(cr);
 
         if (m !== null) {
 
@@ -1514,7 +1501,7 @@ function extractCellResolution(node, errorHandler) {
 
         } else {
 
-            reportWarning(errorHandler, "Malformed cellResolution value (using initial value instead)");
+            reportWarning(errorHandler, 'Malformed cellResolution value (using initial value instead)');
 
         }
 
@@ -1524,26 +1511,25 @@ function extractCellResolution(node, errorHandler) {
 
 }
 
-
 function extractFrameAndTickRate(node, errorHandler) {
 
     // subFrameRate is ignored per IMSC1 specification
 
     // extract frame rate
 
-    var fps_attr = findAttribute(node, ns_ttp, "frameRate");
+    const fps_attr = findAttribute(node, ns_ttp, 'frameRate');
 
     // initial value
 
-    var fps = 30;
+    let fps = 30;
 
     // match variable
 
-    var m;
+    let m;
 
     if (fps_attr !== null) {
 
-        var FRAME_RATE_RE = /(\d+)/;
+        const FRAME_RATE_RE = /(\d+)/;
 
         m = FRAME_RATE_RE.exec(fps_attr);
 
@@ -1553,22 +1539,22 @@ function extractFrameAndTickRate(node, errorHandler) {
 
         } else {
 
-            reportWarning(errorHandler, "Malformed frame rate attribute (using initial value instead)");
+            reportWarning(errorHandler, 'Malformed frame rate attribute (using initial value instead)');
         }
 
     }
 
     // extract frame rate multiplier
 
-    var frm_attr = findAttribute(node, ns_ttp, "frameRateMultiplier");
+    const frm_attr = findAttribute(node, ns_ttp, 'frameRateMultiplier');
 
     // initial value
 
-    var frm = 1;
+    let frm = 1;
 
     if (frm_attr !== null) {
 
-        var FRAME_RATE_MULT_RE = /(\d+) (\d+)/;
+        const FRAME_RATE_MULT_RE = /(\d+) (\d+)/;
 
         m = FRAME_RATE_MULT_RE.exec(frm_attr);
 
@@ -1578,18 +1564,18 @@ function extractFrameAndTickRate(node, errorHandler) {
 
         } else {
 
-            reportWarning(errorHandler, "Malformed frame rate multiplier attribute (using initial value instead)");
+            reportWarning(errorHandler, 'Malformed frame rate multiplier attribute (using initial value instead)');
         }
 
     }
 
-    var efps = frm * fps;
+    const efps = frm * fps;
 
     // extract tick rate
 
-    var tr = 1;
+    let tr = 1;
 
-    var trattr = findAttribute(node, ns_ttp, "tickRate");
+    const trattr = findAttribute(node, ns_ttp, 'tickRate');
 
     if (trattr === null) {
 
@@ -1598,7 +1584,7 @@ function extractFrameAndTickRate(node, errorHandler) {
 
     } else {
 
-        var TICK_RATE_RE = /(\d+)/;
+        const TICK_RATE_RE = /(\d+)/;
 
         m = TICK_RATE_RE.exec(trattr);
 
@@ -1608,7 +1594,7 @@ function extractFrameAndTickRate(node, errorHandler) {
 
         } else {
 
-            reportWarning(errorHandler, "Malformed tick rate attribute (using initial value instead)");
+            reportWarning(errorHandler, 'Malformed tick rate attribute (using initial value instead)');
         }
 
     }
@@ -1619,27 +1605,27 @@ function extractFrameAndTickRate(node, errorHandler) {
 
 function extractExtent(node, errorHandler) {
 
-    var attr = findAttribute(node, ns_tts, "extent");
+    const attr = findAttribute(node, ns_tts, 'extent');
 
     if (attr === null)
         return null;
 
-    var s = attr.split(" ");
+    const s = attr.split(' ');
 
     if (s.length !== 2) {
 
-        reportWarning(errorHandler, "Malformed extent (ignoring)");
+        reportWarning(errorHandler, 'Malformed extent (ignoring)');
 
         return null;
     }
 
-    var w = parseLength(s[0]);
+    const w = parseLength(s[0]);
 
-    var h = parseLength(s[1]);
+    const h = parseLength(s[1]);
 
     if (!h || !w) {
 
-        reportWarning(errorHandler, "Malformed extent values (ignoring)");
+        reportWarning(errorHandler, 'Malformed extent values (ignoring)');
 
         return null;
     }
@@ -1650,16 +1636,16 @@ function extractExtent(node, errorHandler) {
 
 function parseTimeExpression(tickRate, effectiveFrameRate, str) {
 
-    var CLOCK_TIME_FRACTION_RE = /^(\d{2,}):(\d\d):(\d\d(?:\.\d+)?)$/;
-    var CLOCK_TIME_FRAMES_RE = /^(\d{2,}):(\d\d):(\d\d)\:(\d{2,})$/;
-    var OFFSET_FRAME_RE = /^(\d+(?:\.\d+)?)f$/;
-    var OFFSET_TICK_RE = /^(\d+(?:\.\d+)?)t$/;
-    var OFFSET_MS_RE = /^(\d+(?:\.\d+)?)ms$/;
-    var OFFSET_S_RE = /^(\d+(?:\.\d+)?)s$/;
-    var OFFSET_H_RE = /^(\d+(?:\.\d+)?)h$/;
-    var OFFSET_M_RE = /^(\d+(?:\.\d+)?)m$/;
-    var m;
-    var r = null;
+    const CLOCK_TIME_FRACTION_RE = /^(\d{2,}):(\d\d):(\d\d(?:\.\d+)?)$/;
+    const CLOCK_TIME_FRAMES_RE = /^(\d{2,}):(\d\d):(\d\d):(\d{2,})$/;
+    const OFFSET_FRAME_RE = /^(\d+(?:\.\d+)?)f$/;
+    const OFFSET_TICK_RE = /^(\d+(?:\.\d+)?)t$/;
+    const OFFSET_MS_RE = /^(\d+(?:\.\d+)?)ms$/;
+    const OFFSET_S_RE = /^(\d+(?:\.\d+)?)s$/;
+    const OFFSET_H_RE = /^(\d+(?:\.\d+)?)h$/;
+    const OFFSET_M_RE = /^(\d+(?:\.\d+)?)m$/;
+    let m;
+    let r = null;
     if ((m = OFFSET_FRAME_RE.exec(str)) !== null) {
 
         if (effectiveFrameRate !== null) {
@@ -1717,7 +1703,7 @@ function processTiming(doc, parent, node, errorHandler) {
 
     /* determine explicit begin */
 
-    var explicit_begin = null;
+    let explicit_begin = null;
 
     if (node && 'begin' in node.attributes) {
 
@@ -1725,7 +1711,7 @@ function processTiming(doc, parent, node, errorHandler) {
 
         if (explicit_begin === null) {
 
-            reportWarning(errorHandler, "Malformed begin value " + node.attributes.begin.value + " (using 0)");
+            reportWarning(errorHandler, 'Malformed begin value ' + node.attributes.begin.value + ' (using 0)');
 
         }
 
@@ -1733,7 +1719,7 @@ function processTiming(doc, parent, node, errorHandler) {
 
     /* determine explicit duration */
 
-    var explicit_dur = null;
+    let explicit_dur = null;
 
     if (node && 'dur' in node.attributes) {
 
@@ -1741,7 +1727,7 @@ function processTiming(doc, parent, node, errorHandler) {
 
         if (explicit_dur === null) {
 
-            reportWarning(errorHandler, "Malformed dur value " + node.attributes.dur.value + " (ignoring)");
+            reportWarning(errorHandler, 'Malformed dur value ' + node.attributes.dur.value + ' (ignoring)');
 
         }
 
@@ -1749,7 +1735,7 @@ function processTiming(doc, parent, node, errorHandler) {
 
     /* determine explicit end */
 
-    var explicit_end = null;
+    let explicit_end = null;
 
     if (node && 'end' in node.attributes) {
 
@@ -1757,7 +1743,7 @@ function processTiming(doc, parent, node, errorHandler) {
 
         if (explicit_end === null) {
 
-            reportWarning(errorHandler, "Malformed end value (ignoring)");
+            reportWarning(errorHandler, 'Malformed end value (ignoring)');
 
         }
 
@@ -1766,21 +1752,19 @@ function processTiming(doc, parent, node, errorHandler) {
     return {
         explicit_begin: explicit_begin,
         explicit_end: explicit_end,
-        explicit_dur: explicit_dur
+        explicit_dur: explicit_dur,
     };
 
 }
 
-
-
 function mergeChainedStyles(styling, style, errorHandler) {
 
     while (style.styleRefs.length > 0) {
 
-        var sref = style.styleRefs.pop();
+        const sref = style.styleRefs.pop();
 
         if (!(sref in styling.styles)) {
-            reportError(errorHandler, "Non-existant style id referenced");
+            reportError(errorHandler, 'Non-existant style id referenced');
             continue;
         }
 
@@ -1794,12 +1778,12 @@ function mergeChainedStyles(styling, style, errorHandler) {
 
 function mergeReferencedStyles(styling, stylerefs, styleattrs, errorHandler) {
 
-    for (var i = stylerefs.length - 1; i >= 0; i--) {
+    for (let i = stylerefs.length - 1; i >= 0; i--) {
 
-        var sref = stylerefs[i];
+        const sref = stylerefs[i];
 
         if (!(sref in styling.styles)) {
-            reportError(errorHandler, "Non-existant style id referenced");
+            reportError(errorHandler, 'Non-existant style id referenced');
             continue;
         }
 
@@ -1811,9 +1795,9 @@ function mergeReferencedStyles(styling, stylerefs, styleattrs, errorHandler) {
 
 function mergeStylesIfNotPresent(from_styles, into_styles) {
 
-    for (var sname in from_styles) {
+    for (const sname in from_styles) {
 
-        if (!from_styles.hasOwnProperty(sname)) continue;
+        if (!hasOwnProperty(from_styles, sname)) continue;
 
         if (sname in into_styles)
             continue;
@@ -1826,28 +1810,27 @@ function mergeStylesIfNotPresent(from_styles, into_styles) {
 
 /* TODO: validate style format at parsing */
 
-
 /*
  * Binary search utility function
- * 
+ *
  * @typedef {Object} BinarySearchResult
  * @property {boolean} found Was an exact match found?
  * @property {number} index Position of the exact match or insert position
- * 
+ *
  * @returns {BinarySearchResult}
  */
 
 function indexOf(arr, searchval) {
 
-    var min = 0;
-    var max = arr.length - 1;
-    var cur;
+    let min = 0;
+    let max = arr.length - 1;
+    let cur;
 
     while (min <= max) {
 
         cur = Math.floor((min + max) / 2);
 
-        var curval = arr[cur];
+        const curval = arr[cur];
 
         if (curval < searchval) {
 
diff --git a/src/main/js/error.js b/src/main/js/error.js
index 193809dd..84c27f69 100644
--- a/src/main/js/error.js
+++ b/src/main/js/error.js
@@ -1,6 +1,6 @@
 /*
  * ERROR HANDLING UTILITY FUNCTIONS
- * 
+ *
  */
 
 export function reportWarning(errorHandler, msg) {
diff --git a/src/main/js/html.js b/src/main/js/html.js
index 26d21028..5e57ea36 100755
--- a/src/main/js/html.js
+++ b/src/main/js/html.js
@@ -1,4 +1,4 @@
-/* 
+/*
  * Copyright (c) 2016, Pierre-Anthony Lemieux <pal@sandflow.com>
  * All rights reserved.
  *
@@ -31,8 +31,7 @@ import { byName } from './styles.js';
  * @module imscHTML
  */
 
-var browserIsFirefox = /firefox/i.test(navigator.userAgent);
-
+const browserIsFirefox = /firefox/i.test(navigator.userAgent);
 
 /**
  * Function that maps <pre>smpte:background</pre> URIs to URLs resolving to image resource
@@ -41,13 +40,12 @@ var browserIsFirefox = /firefox/i.test(navigator.userAgent);
  * @return {string} PNG resource URL
  */
 
-
 /**
- * Renders an ISD object (returned by <pre>generateISD()</pre>) into a 
+ * Renders an ISD object (returned by <pre>generateISD()</pre>) into a
  * parent element, that must be attached to the DOM. The ISD will be rendered
  * into a child <pre>div</pre>
  * with heigh and width equal to the clientHeight and clientWidth of the element,
- * unless explicitly specified otherwise by the caller. Images URIs specified 
+ * unless explicitly specified otherwise by the caller. Images URIs specified
  * by <pre>smpte:background</pre> attributes are mapped to image resource URLs
  * by an <pre>imgResolver</pre> function. The latter takes the value of <code>smpte:background</code>
  * attribute and an <code>img</code> DOM element as input, and is expected to
@@ -55,18 +53,18 @@ var browserIsFirefox = /firefox/i.test(navigator.userAgent);
  * <pre>displayForcedOnlyMode</pre> sets the (boolean)
  * value of the IMSC1 displayForcedOnlyMode parameter. The function returns
  * an opaque object that should passed in <code>previousISDState</code> when this function
- * is called for the next ISD, otherwise <code>previousISDState</code> should be set to 
+ * is called for the next ISD, otherwise <code>previousISDState</code> should be set to
  * <code>null</code>.
- * 
+ *
  * @param {Object} isd ISD to be rendered
  * @param {Object} element Element into which the ISD is rendered
  * @param {?IMGResolver} imgResolver Resolve <pre>smpte:background</pre> URIs into URLs.
- * @param {?number} eheight Height (in pixel) of the child <div>div</div> or null 
+ * @param {?number} eheight Height (in pixel) of the child <div>div</div> or null
  *                  to use clientHeight of the parent element
  * @param {?number} ewidth Width (in pixel) of the child <div>div</div> or null
  *                  to use clientWidth of the parent element
  * @param {?boolean} displayForcedOnlyMode Value of the IMSC1 displayForcedOnlyMode parameter,
- *                   or false if null         
+ *                   or false if null
  * @param {?module:imscUtils.ErrorHandler} errorHandler Error callback
  * @param {Object} previousISDState State saved during processing of the previous ISD, or null if initial call
  * @param {?boolean} enableRollUp Enables roll-up animations (see CEA 708)
@@ -81,17 +79,17 @@ export function renderHTML(isd,
     displayForcedOnlyMode,
     errorHandler,
     previousISDState,
-    enableRollUp
+    enableRollUp,
 ) {
 
     /* maintain aspect ratio if specified */
 
-    var height = eheight || element.clientHeight;
-    var width = ewidth || element.clientWidth;
+    let height = eheight || element.clientHeight;
+    let width = ewidth || element.clientWidth;
 
     if (isd.aspectRatio !== null) {
 
-        var twidth = height * isd.aspectRatio;
+        const twidth = height * isd.aspectRatio;
 
         if (twidth > width) {
 
@@ -105,19 +103,19 @@ export function renderHTML(isd,
 
     }
 
-    var rootcontainer = document.createElement("div");
+    const rootcontainer = document.createElement('div');
 
-    rootcontainer.style.position = "relative";
-    rootcontainer.style.width = width + "px";
-    rootcontainer.style.height = height + "px";
-    rootcontainer.style.margin = "auto";
+    rootcontainer.style.position = 'relative';
+    rootcontainer.style.width = width + 'px';
+    rootcontainer.style.height = height + 'px';
+    rootcontainer.style.margin = 'auto';
     rootcontainer.style.top = 0;
     rootcontainer.style.bottom = 0;
     rootcontainer.style.left = 0;
     rootcontainer.style.right = 0;
     rootcontainer.style.zIndex = 0;
 
-    var context = {
+    const context = {
         h: height,
         w: width,
         regionH: null,
@@ -136,14 +134,14 @@ export function renderHTML(isd,
         bpd: null, /* block progression direction (lr, rl, tb) */
         ruby: null, /* is ruby present in a <p> */
         textEmphasis: null, /* is textEmphasis present in a <p> */
-        rubyReserve: null /* is rubyReserve applicable to a <p> */
+        rubyReserve: null, /* is rubyReserve applicable to a <p> */
     };
 
     element.appendChild(rootcontainer);
 
-    if ("contents" in isd) {
+    if ('contents' in isd) {
 
-        for (var i = 0; i < isd.contents.length; i++) {
+        for (let i = 0; i < isd.contents.length; i++) {
 
             processElement(context, rootcontainer, isd.contents[i], isd);
 
@@ -157,28 +155,28 @@ export function renderHTML(isd,
 
 function processElement(context, dom_parent, isd_element, isd_parent) {
 
-    var e;
+    let e;
 
     if (isd_element.kind === 'region') {
 
-        e = document.createElement("div");
-        e.style.position = "absolute";
+        e = document.createElement('div');
+        e.style.position = 'absolute';
 
     } else if (isd_element.kind === 'body') {
 
-        e = document.createElement("div");
+        e = document.createElement('div');
 
     } else if (isd_element.kind === 'div') {
 
-        e = document.createElement("div");
+        e = document.createElement('div');
 
     } else if (isd_element.kind === 'image') {
 
-        e = document.createElement("img");
+        e = document.createElement('img');
 
         if (context.imgResolver !== null && isd_element.src !== null) {
 
-            var uri = context.imgResolver(isd_element.src, e);
+            const uri = context.imgResolver(isd_element.src, e);
 
             if (uri)
                 e.src = uri;
@@ -190,36 +188,33 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
 
     } else if (isd_element.kind === 'p') {
 
-        e = document.createElement("p");
+        e = document.createElement('p');
 
     } else if (isd_element.kind === 'span') {
 
-        if (isd_element.styleAttrs[byName.ruby.qname] === "container") {
+        if (isd_element.styleAttrs[byName.ruby.qname] === 'container') {
 
-            e = document.createElement("ruby");
+            e = document.createElement('ruby');
 
             context.ruby = true;
 
-        } else if (isd_element.styleAttrs[byName.ruby.qname] === "base") {
-
-            e = document.createElement("span"); // rb element is deprecated in HTML
+        } else if (isd_element.styleAttrs[byName.ruby.qname] === 'base') {
 
-        } else if (isd_element.styleAttrs[byName.ruby.qname] === "text") {
+            e = document.createElement('span'); // rb element is deprecated in HTML
 
-            e = document.createElement("rt");
+        } else if (isd_element.styleAttrs[byName.ruby.qname] === 'text') {
 
+            e = document.createElement('rt');
 
-        } else if (isd_element.styleAttrs[byName.ruby.qname] === "baseContainer") {
+        } else if (isd_element.styleAttrs[byName.ruby.qname] === 'baseContainer') {
 
-            e = document.createElement("rbc");
+            e = document.createElement('rbc');
 
+        } else if (isd_element.styleAttrs[byName.ruby.qname] === 'textContainer') {
 
-        } else if (isd_element.styleAttrs[byName.ruby.qname] === "textContainer") {
+            e = document.createElement('rtc');
 
-            e = document.createElement("rtc");
-
-
-        } else if (isd_element.styleAttrs[byName.ruby.qname] === "delimiter") {
+        } else if (isd_element.styleAttrs[byName.ruby.qname] === 'delimiter') {
 
             /* ignore rp */
 
@@ -227,7 +222,7 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
 
         } else {
 
-            e = document.createElement("span");
+            e = document.createElement('span');
 
         }
 
@@ -235,13 +230,13 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
 
     } else if (isd_element.kind === 'br') {
 
-        e = document.createElement("br");
+        e = document.createElement('br');
 
     }
 
     if (!e) {
 
-        reportError(context.errorHandler, "Error processing ISD element kind: " + isd_element.kind);
+        reportError(context.errorHandler, 'Error processing ISD element kind: ' + isd_element.kind);
 
         return;
 
@@ -264,51 +259,51 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
     /* override UA default margin */
     /* TODO: should apply to <p> only */
 
-    e.style.margin = "0";
+    e.style.margin = '0';
 
     /* determine ipd and bpd */
 
-    if (isd_element.kind === "region") {
+    if (isd_element.kind === 'region') {
 
-        var wdir = isd_element.styleAttrs[byName.writingMode.qname];
+        const wdir = isd_element.styleAttrs[byName.writingMode.qname];
 
-        if (wdir === "lrtb" || wdir === "lr") {
+        if (wdir === 'lrtb' || wdir === 'lr') {
 
-            context.ipd = "lr";
-            context.bpd = "tb";
+            context.ipd = 'lr';
+            context.bpd = 'tb';
 
-        } else if (wdir === "rltb" || wdir === "rl") {
+        } else if (wdir === 'rltb' || wdir === 'rl') {
 
-            context.ipd = "rl";
-            context.bpd = "tb";
+            context.ipd = 'rl';
+            context.bpd = 'tb';
 
-        } else if (wdir === "tblr") {
+        } else if (wdir === 'tblr') {
 
-            context.ipd = "tb";
-            context.bpd = "lr";
+            context.ipd = 'tb';
+            context.bpd = 'lr';
 
-        } else if (wdir === "tbrl" || wdir === "tb") {
+        } else if (wdir === 'tbrl' || wdir === 'tb') {
 
-            context.ipd = "tb";
-            context.bpd = "rl";
+            context.ipd = 'tb';
+            context.bpd = 'rl';
 
         }
 
-    } else if (isd_element.kind === "p" && context.bpd === "tb") {
+    } else if (isd_element.kind === 'p' && context.bpd === 'tb') {
 
-        var pdir = isd_element.styleAttrs[byName.direction.qname];
+        const pdir = isd_element.styleAttrs[byName.direction.qname];
 
-        context.ipd = pdir === "ltr" ? "lr" : "rl";
+        context.ipd = pdir === 'ltr' ? 'lr' : 'rl';
 
     }
 
     /* tranform TTML styles to CSS styles */
 
-    for (var i = 0; i < STYLING_MAP_DEFS.length; i++) {
+    for (let i = 0; i < STYLING_MAP_DEFS.length; i++) {
 
-        var sm = STYLING_MAP_DEFS[i];
+        const sm = STYLING_MAP_DEFS[i];
 
-        var attr = isd_element.styleAttrs[sm.qname];
+        const attr = isd_element.styleAttrs[sm.qname];
 
         if (attr !== undefined && sm.map !== null) {
 
@@ -318,24 +313,23 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
 
     }
 
-    var proc_e = e;
+    let proc_e = e;
 
     /* do we have linePadding ? */
 
-    var lp = isd_element.styleAttrs[byName.linePadding.qname];
+    const lp = isd_element.styleAttrs[byName.linePadding.qname];
 
     if (lp && (!lp.isZero())) {
 
-        var plength = lp.toUsedLength(context.w, context.h);
-
+        const plength = lp.toUsedLength(context.w, context.h);
 
         if (plength > 0) {
 
             /* apply padding to the <p> so that line padding does not cause line wraps */
 
-            var padmeasure = Math.ceil(plength) + "px";
+            const padmeasure = Math.ceil(plength) + 'px';
 
-            if (context.bpd === "tb") {
+            if (context.bpd === 'tb') {
 
                 proc_e.style.paddingLeft = padmeasure;
                 proc_e.style.paddingRight = padmeasure;
@@ -353,15 +347,15 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
 
     // do we have multiRowAlign?
 
-    var mra = isd_element.styleAttrs[byName.multiRowAlign.qname];
+    const mra = isd_element.styleAttrs[byName.multiRowAlign.qname];
 
-    if (mra && mra !== "auto") {
+    if (mra && mra !== 'auto') {
 
         /* create inline block to handle multirowAlign */
 
-        var s = document.createElement("span");
+        const s = document.createElement('span');
 
-        s.style.display = "inline-block";
+        s.style.display = 'inline-block';
 
         s.style.textAlign = mra;
 
@@ -375,32 +369,30 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
 
     /* do we have rubyReserve? */
 
-    var rr = isd_element.styleAttrs[byName.rubyReserve.qname];
+    const rr = isd_element.styleAttrs[byName.rubyReserve.qname];
 
-    if (rr && rr[0] !== "none") {
+    if (rr && rr[0] !== 'none') {
         context.rubyReserve = rr;
     }
 
-
     /* remember we are filling line gaps */
 
     if (isd_element.styleAttrs[byName.fillLineGap.qname]) {
         context.flg = true;
     }
 
+    if (isd_element.kind === 'span' && isd_element.text) {
 
-    if (isd_element.kind === "span" && isd_element.text) {
+        const te = isd_element.styleAttrs[byName.textEmphasis.qname];
 
-        var te = isd_element.styleAttrs[byName.textEmphasis.qname];
-
-        if (te && te.style !== "none") {
+        if (te && te.style !== 'none') {
 
             context.textEmphasis = true;
 
         }
 
         if (byName.textCombine.qname in isd_element.styleAttrs &&
-            isd_element.styleAttrs[byName.textCombine.qname] === "all") {
+            isd_element.styleAttrs[byName.textCombine.qname] === 'all') {
 
             /* ignore tate-chu-yoku since line break cannot happen within */
             e.textContent = isd_element.text;
@@ -416,19 +408,19 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
 
             // wrap characters in spans to find the line wrap locations
 
-            var cbuf = '';
+            let cbuf = '';
 
-            for (var j = 0; j < isd_element.text.length; j++) {
+            for (let j = 0; j < isd_element.text.length; j++) {
 
                 cbuf += isd_element.text.charAt(j);
 
-                var cc = isd_element.text.charCodeAt(j);
+                const cc = isd_element.text.charCodeAt(j);
 
                 if (cc < 0xD800 || cc > 0xDBFF || j === isd_element.text.length - 1) {
 
                     /* wrap the character(s) in a span unless it is a high surrogate */
 
-                    var span = document.createElement("span");
+                    const span = document.createElement('span');
 
                     span.textContent = cbuf;
 
@@ -455,9 +447,9 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
 
     /* process the children of the ISD element */
 
-    if ("contents" in isd_element) {
+    if ('contents' in isd_element) {
 
-        for (var k = 0; k < isd_element.contents.length; k++) {
+        for (let k = 0; k < isd_element.contents.length; k++) {
 
             processElement(context, proc_e, isd_element.contents[k], isd_element);
 
@@ -467,13 +459,12 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
 
     /* list of lines */
 
-    var linelist = [];
-
+    const linelist = [];
 
     /* paragraph processing */
     /* TODO: linePadding only supported for horizontal scripts */
 
-    if (isd_element.kind === "p") {
+    if (isd_element.kind === 'p') {
 
         constructLineList(context, proc_e, linelist, null);
 
@@ -533,7 +524,7 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
 
         if (context.flg) {
 
-            var par_edges = rect2edges(proc_e.getBoundingClientRect(), context);
+            const par_edges = rect2edges(proc_e.getBoundingClientRect(), context);
 
             applyFillLineGap(linelist, par_edges.before, par_edges.after, context, proc_e);
 
@@ -543,13 +534,12 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
 
     }
 
-
     /* region processing */
 
-    if (isd_element.kind === "region") {
+    if (isd_element.kind === 'region') {
 
         /* perform roll up if needed */
-        if ((context.bpd === "tb") &&
+        if ((context.bpd === 'tb') &&
             context.enableRollUp &&
             isd_element.contents.length > 0 &&
             isd_element.styleAttrs[byName.displayAlign.qname] === 'after') {
@@ -559,9 +549,9 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
 
             /* horrible hack, perhaps default region id should be underscore everywhere? */
 
-            var rid = isd_element.id === '' ? '_' : isd_element.id;
+            const rid = isd_element.id === '' ? '_' : isd_element.id;
 
-            var rb = new RegionPBuffer(rid, linelist);
+            const rb = new RegionPBuffer(rid, linelist);
 
             context.currentISDState[rb.id] = rb;
 
@@ -572,14 +562,14 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
                 rb.plist[rb.plist.length - 2].text ===
                 context.previousISDState[rb.id].plist[context.previousISDState[rb.id].plist.length - 1].text) {
 
-                var body_elem = e.firstElementChild;
+                const body_elem = e.firstElementChild;
 
-                var h = rb.plist[rb.plist.length - 1].after - rb.plist[rb.plist.length - 1].before;
+                const h = rb.plist[rb.plist.length - 1].after - rb.plist[rb.plist.length - 1].before;
 
-                body_elem.style.bottom = "-" + h + "px";
-                body_elem.style.transition = "transform 0.4s";
-                body_elem.style.position = "relative";
-                body_elem.style.transform = "translateY(-" + h + "px)";
+                body_elem.style.bottom = '-' + h + 'px';
+                body_elem.style.transition = 'transform 0.4s';
+                body_elem.style.position = 'relative';
+                body_elem.style.transform = 'translateY(-' + h + 'px)';
 
             }
 
@@ -589,14 +579,14 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
 
 function mergeSpans(lineList, context) {
 
-    for (var i = 0; i < lineList.length; i++) {
+    for (let i = 0; i < lineList.length; i++) {
 
-        var line = lineList[i];
+        const line = lineList[i];
 
-        for (var j = 1; j < line.elements.length;) {
+        for (let j = 1; j < line.elements.length;) {
 
-            var previous = line.elements[j - 1];
-            var span = line.elements[j];
+            const previous = line.elements[j - 1];
+            const span = line.elements[j];
 
             if (spanMerge(previous.node, span.node, context)) {
 
@@ -614,12 +604,12 @@ function mergeSpans(lineList, context) {
     }
 
     // Copy backgroundColor to each span so that fillLineGap will apply padding to elements with the right background
-    var thisNode, ancestorBackgroundColor;
-    var clearTheseBackgrounds = [];
+    let thisNode, ancestorBackgroundColor;
+    const clearTheseBackgrounds = [];
 
-    for (var l = 0; l < lineList.length; l++) {
+    for (let l = 0; l < lineList.length; l++) {
 
-        for (var el = 0; el < lineList[l].elements.length; el++) {
+        for (let el = 0; el < lineList[l].elements.length; el++) {
 
             thisNode = lineList[l].elements[el].node;
             ancestorBackgroundColor = getSpanAncestorColor(thisNode, clearTheseBackgrounds, false);
@@ -632,9 +622,9 @@ function mergeSpans(lineList, context) {
         }
     }
 
-    for (var bi = 0; bi < clearTheseBackgrounds.length; bi++) {
+    for (let bi = 0; bi < clearTheseBackgrounds.length; bi++) {
 
-        clearTheseBackgrounds[bi].style.backgroundColor = "";
+        clearTheseBackgrounds[bi].style.backgroundColor = '';
 
     }
 }
@@ -652,11 +642,11 @@ function getSpanAncestorColor(element, ancestorList, isAncestor) {
 
     } else {
 
-        if (element.parentElement.nodeName === "SPAN" ||
-            element.parentElement.nodeName === "RUBY" ||
-            element.parentElement.nodeName === "RBC" ||
-            element.parentElement.nodeName === "RTC" ||
-            element.parentElement.nodeName === "RT") {
+        if (element.parentElement.nodeName === 'SPAN' ||
+            element.parentElement.nodeName === 'RUBY' ||
+            element.parentElement.nodeName === 'RBC' ||
+            element.parentElement.nodeName === 'RTC' ||
+            element.parentElement.nodeName === 'RT') {
 
             return getSpanAncestorColor(element.parentElement, ancestorList, true);
 
@@ -669,23 +659,23 @@ function getSpanAncestorColor(element, ancestorList, isAncestor) {
 
 function spanMerge(first, second, context) {
 
-    if (first.tagName === "SPAN" &&
-        second.tagName === "SPAN" &&
+    if (first.tagName === 'SPAN' &&
+        second.tagName === 'SPAN' &&
         first._isd_element === second._isd_element) {
         if (!first._isd_element) {
             /* we should never get here since every span should have a source ISD element */
-            reportError(context.errorHandler, "Internal error: HTML span is not linked to a source element; cannot merge spans.");
+            reportError(context.errorHandler, 'Internal error: HTML span is not linked to a source element; cannot merge spans.');
             return false;
         }
 
         first.textContent += second.textContent;
 
-        for (var i = 0; i < second.style.length; i++) {
+        for (let i = 0; i < second.style.length; i++) {
 
-            var styleName = second.style[i];
-            if (styleName.indexOf("border") >= 0 ||
-                styleName.indexOf("padding") >= 0 ||
-                styleName.indexOf("margin") >= 0) {
+            const styleName = second.style[i];
+            if (styleName.indexOf('border') >= 0 ||
+                styleName.indexOf('padding') >= 0 ||
+                styleName.indexOf('margin') >= 0) {
 
                 first.style[styleName] = second.style[styleName];
 
@@ -704,24 +694,24 @@ function applyLinePadding(lineList, lp, context) {
 
     if (lineList === null) return;
 
-    for (var i = 0; i < lineList.length; i++) {
+    for (let i = 0; i < lineList.length; i++) {
 
-        var l = lineList[i].elements.length;
+        const l = lineList[i].elements.length;
 
-        var pospadpxlen = Math.ceil(lp) + "px";
+        const pospadpxlen = Math.ceil(lp) + 'px';
 
-        var negpadpxlen = "-" + Math.ceil(lp) + "px";
+        const negpadpxlen = '-' + Math.ceil(lp) + 'px';
 
         if (l !== 0) {
 
-            var se = lineList[i].elements[lineList[i].start_elem];
+            const se = lineList[i].elements[lineList[i].start_elem];
 
-            var ee = lineList[i].elements[lineList[i].end_elem];
+            const ee = lineList[i].elements[lineList[i].end_elem];
 
             if (se === ee) {
 
                 // Check to see if there's any background at all
-                var elementBoundingRect = se.node.getBoundingClientRect();
+                const elementBoundingRect = se.node.getBoundingClientRect();
 
                 if (elementBoundingRect.width == 0 || elementBoundingRect.height == 0) {
 
@@ -733,17 +723,17 @@ function applyLinePadding(lineList, lp, context) {
             }
 
             // Start element
-            if (context.ipd === "lr") {
+            if (context.ipd === 'lr') {
 
                 se.node.style.marginLeft = negpadpxlen;
                 se.node.style.paddingLeft = pospadpxlen;
 
-            } else if (context.ipd === "rl") {
+            } else if (context.ipd === 'rl') {
 
                 se.node.style.paddingRight = pospadpxlen;
                 se.node.style.marginRight = negpadpxlen;
 
-            } else if (context.ipd === "tb") {
+            } else if (context.ipd === 'tb') {
 
                 se.node.style.paddingTop = pospadpxlen;
                 se.node.style.marginTop = negpadpxlen;
@@ -751,7 +741,7 @@ function applyLinePadding(lineList, lp, context) {
             }
 
             // End element
-            if (context.ipd === "lr") {
+            if (context.ipd === 'lr') {
 
                 // Firefox has a problem with line-breaking when a negative margin is applied.
                 // The positioning will be wrong but don't apply when on firefox.
@@ -761,14 +751,14 @@ function applyLinePadding(lineList, lp, context) {
                 }
                 ee.node.style.paddingRight = pospadpxlen;
 
-            } else if (context.ipd === "rl") {
+            } else if (context.ipd === 'rl') {
 
                 ee.node.style.paddingLeft = pospadpxlen;
                 if (!browserIsFirefox) {
                     ee.node.style.marginLeft = negpadpxlen;
                 }
 
-            } else if (context.ipd === "tb") {
+            } else if (context.ipd === 'tb') {
 
                 ee.node.style.paddingBottom = pospadpxlen;
                 ee.node.style.marginBottom = negpadpxlen;
@@ -785,14 +775,14 @@ function applyMultiRowAlign(lineList) {
 
     /* apply an explicit br to all but the last line */
 
-    for (var i = 0; i < lineList.length - 1; i++) {
+    for (let i = 0; i < lineList.length - 1; i++) {
 
-        var l = lineList[i].elements.length;
+        const l = lineList[i].elements.length;
 
         if (l !== 0 && lineList[i].br === false) {
-            var br = document.createElement("br");
+            const br = document.createElement('br');
 
-            var lastnode = lineList[i].elements[l - 1].node;
+            const lastnode = lineList[i].elements[l - 1].node;
 
             lastnode.parentElement.insertBefore(br, lastnode.nextSibling);
         }
@@ -805,32 +795,31 @@ function applyTextEmphasisOutside(lineList, context) {
 
     /* supports "outside" only */
 
-    for (var i = 0; i < lineList.length; i++) {
+    for (let i = 0; i < lineList.length; i++) {
 
-        for (var j = 0; j < lineList[i].te.length; j++) {
+        for (let j = 0; j < lineList[i].te.length; j++) {
 
             /* skip if position already set */
 
             if (lineList[i].te[j].style[TEXTEMPHASISPOSITION_PROP] &&
-                lineList[i].te[j].style[TEXTEMPHASISPOSITION_PROP] !== "none")
+                lineList[i].te[j].style[TEXTEMPHASISPOSITION_PROP] !== 'none')
                 continue;
 
-            var pos;
-
-            if (context.bpd === "tb") {
+            let pos;
 
-                pos = (i === 0) ? "left over" : "left under";
+            if (context.bpd === 'tb') {
 
+                pos = (i === 0) ? 'left over' : 'left under';
 
             } else {
 
-                if (context.bpd === "rl") {
+                if (context.bpd === 'rl') {
 
-                    pos = (i === 0) ? "right under" : "left under";
+                    pos = (i === 0) ? 'right under' : 'left under';
 
                 } else {
 
-                    pos = (i === 0) ? "left under" : "right under";
+                    pos = (i === 0) ? 'left under' : 'right under';
 
                 }
 
@@ -846,37 +835,36 @@ function applyTextEmphasisOutside(lineList, context) {
 
 function applyRubyPosition(lineList, context) {
 
-    for (var i = 0; i < lineList.length; i++) {
+    for (let i = 0; i < lineList.length; i++) {
 
-        for (var j = 0; j < lineList[i].rbc.length; j++) {
+        for (let j = 0; j < lineList[i].rbc.length; j++) {
 
             /* skip if ruby-position already set */
 
             if (lineList[i].rbc[j].style[RUBYPOSITION_PROP])
                 continue;
 
-            var pos;
+            let pos;
 
             if (RUBYPOSITION_ISWK) {
 
                 /* WebKit exception */
 
-                pos = (i === 0) ? "before" : "after";
+                pos = (i === 0) ? 'before' : 'after';
 
-            } else if (context.bpd === "tb") {
-
-                pos = (i === 0) ? "over" : "under";
+            } else if (context.bpd === 'tb') {
 
+                pos = (i === 0) ? 'over' : 'under';
 
             } else {
 
-                if (context.bpd === "rl") {
+                if (context.bpd === 'rl') {
 
-                    pos = (i === 0) ? "over" : "under";
+                    pos = (i === 0) ? 'over' : 'under';
 
                 } else {
 
-                    pos = (i === 0) ? "under" : "over";
+                    pos = (i === 0) ? 'under' : 'over';
 
                 }
 
@@ -892,30 +880,30 @@ function applyRubyPosition(lineList, context) {
 
 function applyRubyReserve(lineList, context) {
 
-    for (var i = 0; i < lineList.length; i++) {
+    for (let i = 0; i < lineList.length; i++) {
 
-        var ruby = document.createElement("ruby");
+        const ruby = document.createElement('ruby');
 
-        var rb = document.createElement("span");  // rb element is deprecated in HTML
-        rb.textContent = "\u200B";
+        const rb = document.createElement('span');  // rb element is deprecated in HTML
+        rb.textContent = '\u200B';
 
         ruby.appendChild(rb);
 
-        var rt1;
-        var rt2;
+        let rt1;
+        let rt2;
 
-        var fs = context.rubyReserve[1].toUsedLength(context.w, context.h) + "px";
+        const fs = context.rubyReserve[1].toUsedLength(context.w, context.h) + 'px';
 
-        if (context.rubyReserve[0] === "both" || (context.rubyReserve[0] === "outside" && lineList.length == 1)) {
+        if (context.rubyReserve[0] === 'both' || (context.rubyReserve[0] === 'outside' && lineList.length == 1)) {
 
-            rt1 = document.createElement("rtc");
-            rt1.style[RUBYPOSITION_PROP] = RUBYPOSITION_ISWK ? "after" : "under";
-            rt1.textContent = "\u200B";
+            rt1 = document.createElement('rtc');
+            rt1.style[RUBYPOSITION_PROP] = RUBYPOSITION_ISWK ? 'after' : 'under';
+            rt1.textContent = '\u200B';
             rt1.style.fontSize = fs;
 
-            rt2 = document.createElement("rtc");
-            rt2.style[RUBYPOSITION_PROP] = RUBYPOSITION_ISWK ? "before" : "over";
-            rt2.textContent = "\u200B";
+            rt2 = document.createElement('rtc');
+            rt2.style[RUBYPOSITION_PROP] = RUBYPOSITION_ISWK ? 'before' : 'over';
+            rt2.textContent = '\u200B';
             rt2.style.fontSize = fs;
 
             ruby.appendChild(rt1);
@@ -923,19 +911,19 @@ function applyRubyReserve(lineList, context) {
 
         } else {
 
-            rt1 = document.createElement("rtc");
-            rt1.textContent = "\u200B";
+            rt1 = document.createElement('rtc');
+            rt1.textContent = '\u200B';
             rt1.style.fontSize = fs;
 
-            var pos;
+            let pos;
 
-            if (context.rubyReserve[0] === "after" || (context.rubyReserve[0] === "outside" && i > 0)) {
+            if (context.rubyReserve[0] === 'after' || (context.rubyReserve[0] === 'outside' && i > 0)) {
 
-                pos = RUBYPOSITION_ISWK ? "after" : ((context.bpd === "tb" || context.bpd === "rl") ? "under" : "over");
+                pos = RUBYPOSITION_ISWK ? 'after' : ((context.bpd === 'tb' || context.bpd === 'rl') ? 'under' : 'over');
 
             } else {
 
-                pos = RUBYPOSITION_ISWK ? "before" : ((context.bpd === "tb" || context.bpd === "rl") ? "over" : "under");
+                pos = RUBYPOSITION_ISWK ? 'before' : ((context.bpd === 'tb' || context.bpd === 'rl') ? 'over' : 'under');
 
             }
 
@@ -947,9 +935,9 @@ function applyRubyReserve(lineList, context) {
 
         /* add in front of the first ruby element of the line, if it exists */
 
-        var sib = null;
+        let sib = null;
 
-        for (var j = 0; j < lineList[i].rbc.length; j++) {
+        for (let j = 0; j < lineList[i].rbc.length; j++) {
 
             if (lineList[i].rbc[j].localName === 'ruby') {
 
@@ -957,7 +945,7 @@ function applyRubyReserve(lineList, context) {
 
                 /* copy specified style properties from the sibling ruby container */
 
-                for (var k = 0; k < sib.style.length; k++) {
+                for (let k = 0; k < sib.style.length; k++) {
 
                     ruby.style.setProperty(sib.style.item(k), sib.style.getPropertyValue(sib.style.item(k)));
 
@@ -978,16 +966,16 @@ function applyRubyReserve(lineList, context) {
 
 }
 
-function applyFillLineGap(lineList, par_before, par_after, context, element) {
+function applyFillLineGap(lineList, par_before, par_after, context) {
 
     /* positive for BPD = lr and tb, negative for BPD = rl */
-    var s = Math.sign(par_after - par_before);
+    const s = Math.sign(par_after - par_before);
 
-    for (var i = 0; i <= lineList.length; i++) {
+    for (let i = 0; i <= lineList.length; i++) {
 
         /* compute frontier between lines */
 
-        var frontier;
+        let frontier;
 
         if (i === 0) {
 
@@ -1003,8 +991,9 @@ function applyFillLineGap(lineList, par_before, par_after, context, element) {
 
         }
 
-        var padding;
-        var l, thisNode;
+        let padding;
+        let l;
+        let thisNode;
 
         /* before line */
         if (i > 0) {
@@ -1014,17 +1003,17 @@ function applyFillLineGap(lineList, par_before, par_after, context, element) {
                 for (l = 0; l < lineList[i - 1].elements.length; l++) {
 
                     thisNode = lineList[i - 1].elements[l];
-                    padding = s * (frontier - thisNode.after) + "px";
+                    padding = s * (frontier - thisNode.after) + 'px';
 
-                    if (context.bpd === "lr") {
+                    if (context.bpd === 'lr') {
 
                         thisNode.node.style.paddingRight = padding;
 
-                    } else if (context.bpd === "rl") {
+                    } else if (context.bpd === 'rl') {
 
                         thisNode.node.style.paddingLeft = padding;
 
-                    } else if (context.bpd === "tb") {
+                    } else if (context.bpd === 'tb') {
 
                         thisNode.node.style.paddingBottom = padding;
 
@@ -1042,17 +1031,17 @@ function applyFillLineGap(lineList, par_before, par_after, context, element) {
             for (l = 0; l < lineList[i].elements.length; l++) {
 
                 thisNode = lineList[i].elements[l];
-                padding = s * (thisNode.before - frontier) + "px";
+                padding = s * (thisNode.before - frontier) + 'px';
 
-                if (context.bpd === "lr") {
+                if (context.bpd === 'lr') {
 
                     thisNode.node.style.paddingLeft = padding;
 
-                } else if (context.bpd === "rl") {
+                } else if (context.bpd === 'rl') {
 
                     thisNode.node.style.paddingRight = padding;
 
-                } else if (context.bpd === "tb") {
+                } else if (context.bpd === 'tb') {
 
                     thisNode.node.style.paddingTop = padding;
 
@@ -1077,14 +1066,14 @@ class RegionPBuffer {
 
 function rect2edges(rect, context) {
 
-    var edges = { before: null, after: null, start: null, end: null };
+    const edges = { before: null, after: null, start: null, end: null };
 
-    if (context.bpd === "tb") {
+    if (context.bpd === 'tb') {
 
         edges.before = rect.top;
         edges.after = rect.bottom;
 
-        if (context.ipd === "lr") {
+        if (context.ipd === 'lr') {
 
             edges.start = rect.left;
             edges.end = rect.right;
@@ -1095,14 +1084,14 @@ function rect2edges(rect, context) {
             edges.end = rect.left;
         }
 
-    } else if (context.bpd === "lr") {
+    } else if (context.bpd === 'lr') {
 
         edges.before = rect.left;
         edges.after = rect.right;
         edges.start = rect.top;
         edges.end = rect.bottom;
 
-    } else if (context.bpd === "rl") {
+    } else if (context.bpd === 'rl') {
 
         edges.before = rect.right;
         edges.after = rect.left;
@@ -1117,7 +1106,7 @@ function rect2edges(rect, context) {
 
 function constructLineList(context, element, llist, bgcolor) {
 
-    if (element.localName === "rt" || element.localName === "rtc") {
+    if (element.localName === 'rt' || element.localName === 'rtc') {
 
         /* skip ruby annotations */
 
@@ -1125,15 +1114,15 @@ function constructLineList(context, element, llist, bgcolor) {
 
     }
 
-    var curbgcolor = element.style.backgroundColor || bgcolor;
+    const curbgcolor = element.style.backgroundColor || bgcolor;
 
     if (element.childElementCount === 0) {
 
         if (element.localName === 'span' || element.localName === 'rb') {
 
-            var r = element.getBoundingClientRect();
+            const r = element.getBoundingClientRect();
 
-            var edges = rect2edges(r, context);
+            const edges = rect2edges(r, context);
 
             if (llist.length === 0 ||
                 (!isSameLine(edges.before, edges.after, llist[llist.length - 1].before, llist[llist.length - 1].after))
@@ -1148,17 +1137,17 @@ function constructLineList(context, element, llist, bgcolor) {
                     elements: [],
                     rbc: [],
                     te: [],
-                    text: "",
-                    br: false
+                    text: '',
+                    br: false,
                 });
 
             } else {
 
                 /* positive for BPD = lr and tb, negative for BPD = rl */
-                var bpd_dir = Math.sign(edges.after - edges.before);
+                const bpd_dir = Math.sign(edges.after - edges.before);
 
                 /* positive for IPD = lr and tb, negative for IPD = rl */
-                var ipd_dir = Math.sign(edges.end - edges.start);
+                const ipd_dir = Math.sign(edges.end - edges.start);
 
                 /* check if the line height has increased */
 
@@ -1189,8 +1178,8 @@ function constructLineList(context, element, llist, bgcolor) {
                     node: element,
                     bgcolor: curbgcolor,
                     before: edges.before,
-                    after: edges.after
-                }
+                    after: edges.after,
+                },
             );
 
         } else if (element.localName === 'br' && llist.length !== 0) {
@@ -1201,7 +1190,7 @@ function constructLineList(context, element, llist, bgcolor) {
 
     } else {
 
-        var child = element.firstChild;
+        let child = element.firstChild;
 
         while (child) {
 
@@ -1221,7 +1210,7 @@ function constructLineList(context, element, llist, bgcolor) {
 
                 } else if (child.localName === 'span' &&
                     child.style[TEXTEMPHASISSTYLE_PROP] &&
-                    child.style[TEXTEMPHASISSTYLE_PROP] !== "none") {
+                    child.style[TEXTEMPHASISSTYLE_PROP] !== 'none') {
 
                     /* remember non-empty span elements with textEmphasis */
 
@@ -1233,7 +1222,6 @@ function constructLineList(context, element, llist, bgcolor) {
 
                 }
 
-
             }
 
             child = child.nextSibling;
@@ -1252,41 +1240,40 @@ function applyTextEmphasis(context, dom_element, isd_element, attr) {
 
     /* ignore color (not used in IMSC 1.1) */
 
-    if (attr.style === "none") {
+    if (attr.style === 'none') {
 
         /* text-emphasis is not inherited and the default is none, so nothing to do */
 
         return;
 
-    } else if (attr.style === "auto") {
+    } else if (attr.style === 'auto') {
 
-        dom_element.style[TEXTEMPHASISSTYLE_PROP] = "filled";
+        dom_element.style[TEXTEMPHASISSTYLE_PROP] = 'filled';
 
     } else {
 
-        dom_element.style[TEXTEMPHASISSTYLE_PROP] = attr.style + " " + attr.symbol;
+        dom_element.style[TEXTEMPHASISSTYLE_PROP] = attr.style + ' ' + attr.symbol;
     }
 
     /* ignore "outside" position (set in postprocessing) */
 
-    if (attr.position === "before" || attr.position === "after") {
+    if (attr.position === 'before' || attr.position === 'after') {
 
-        var pos;
+        let pos;
 
-        if (context.bpd === "tb") {
-
-            pos = (attr.position === "before") ? "left over" : "left under";
+        if (context.bpd === 'tb') {
 
+            pos = (attr.position === 'before') ? 'left over' : 'left under';
 
         } else {
 
-            if (context.bpd === "rl") {
+            if (context.bpd === 'rl') {
 
-                pos = (attr.position === "before") ? "right under" : "left under";
+                pos = (attr.position === 'before') ? 'right under' : 'left under';
 
             } else {
 
-                pos = (attr.position === "before") ? "left under" : "right under";
+                pos = (attr.position === 'before') ? 'left under' : 'right under';
 
             }
 
@@ -1303,91 +1290,90 @@ class HTMLStylingMapDefinition {
     }
 }
 
-var STYLING_MAP_DEFS = [
+const STYLING_MAP_DEFS = [
 
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling backgroundColor",
+        'http://www.w3.org/ns/ttml#styling backgroundColor',
         function (context, dom_element, isd_element, attr) {
 
             /* skip if transparent */
             if (attr[3] === 0)
                 return;
 
-            dom_element.style.backgroundColor = "rgba(" +
-                attr[0].toString() + "," +
-                attr[1].toString() + "," +
-                attr[2].toString() + "," +
+            dom_element.style.backgroundColor = 'rgba(' +
+                attr[0].toString() + ',' +
+                attr[1].toString() + ',' +
+                attr[2].toString() + ',' +
                 (attr[3] / 255).toString() +
-                ")";
-        }
+                ')';
+        },
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling color",
+        'http://www.w3.org/ns/ttml#styling color',
         function (context, dom_element, isd_element, attr) {
-            dom_element.style.color = "rgba(" +
-                attr[0].toString() + "," +
-                attr[1].toString() + "," +
-                attr[2].toString() + "," +
+            dom_element.style.color = 'rgba(' +
+                attr[0].toString() + ',' +
+                attr[1].toString() + ',' +
+                attr[2].toString() + ',' +
                 (attr[3] / 255).toString() +
-                ")";
-        }
+                ')';
+        },
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling direction",
+        'http://www.w3.org/ns/ttml#styling direction',
         function (context, dom_element, isd_element, attr) {
 
             dom_element.style.direction = attr;
 
-        }
+        },
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling display",
-        function (context, dom_element, isd_element, attr) { }
+        'http://www.w3.org/ns/ttml#styling display',
+        function () { },
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling displayAlign",
+        'http://www.w3.org/ns/ttml#styling displayAlign',
         function (context, dom_element, isd_element, attr) {
 
             /* see https://css-tricks.com/snippets/css/a-guide-to-flexbox/ */
 
             /* TODO: is this affected by writing direction? */
 
-            dom_element.style.display = "flex";
-            dom_element.style.flexDirection = "column";
-
+            dom_element.style.display = 'flex';
+            dom_element.style.flexDirection = 'column';
 
-            if (attr === "before") {
+            if (attr === 'before') {
 
-                dom_element.style.justifyContent = "flex-start";
+                dom_element.style.justifyContent = 'flex-start';
 
-            } else if (attr === "center") {
+            } else if (attr === 'center') {
 
-                dom_element.style.justifyContent = "center";
+                dom_element.style.justifyContent = 'center';
 
-            } else if (attr === "after") {
+            } else if (attr === 'after') {
 
-                dom_element.style.justifyContent = "flex-end";
+                dom_element.style.justifyContent = 'flex-end';
             }
 
-        }
+        },
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling extent",
+        'http://www.w3.org/ns/ttml#styling extent',
         function (context, dom_element, isd_element, attr) {
             /* TODO: this is super ugly */
 
             context.regionH = attr.h.toUsedLength(context.w, context.h);
             context.regionW = attr.w.toUsedLength(context.w, context.h);
 
-            /* 
+            /*
              * CSS height/width are measured against the content rectangle,
              * whereas TTML height/width include padding
              */
 
-            var hdelta = 0;
-            var wdelta = 0;
+            let hdelta = 0;
+            let wdelta = 0;
 
-            var p = isd_element.styleAttrs["http://www.w3.org/ns/ttml#styling padding"];
+            const p = isd_element.styleAttrs['http://www.w3.org/ns/ttml#styling padding'];
 
             if (!p) {
 
@@ -1400,56 +1386,56 @@ var STYLING_MAP_DEFS = [
 
             }
 
-            dom_element.style.height = (context.regionH - hdelta) + "px";
-            dom_element.style.width = (context.regionW - wdelta) + "px";
+            dom_element.style.height = (context.regionH - hdelta) + 'px';
+            dom_element.style.width = (context.regionW - wdelta) + 'px';
 
-        }
+        },
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling fontFamily",
+        'http://www.w3.org/ns/ttml#styling fontFamily',
         function (context, dom_element, isd_element, attr) {
 
-            var rslt = [];
+            let rslt = [];
 
             /* per IMSC1 */
 
-            for (var i = 0; i < attr.length; i++) {
+            for (let i = 0; i < attr.length; i++) {
                 attr[i] = attr[i].trim();
 
-                if (attr[i] === "monospaceSerif") {
+                if (attr[i] === 'monospaceSerif') {
 
-                    rslt.push("Courier New");
+                    rslt.push('Courier New');
                     rslt.push('"Liberation Mono"');
-                    rslt.push("Courier");
-                    rslt.push("monospace");
+                    rslt.push('Courier');
+                    rslt.push('monospace');
 
-                } else if (attr[i] === "proportionalSansSerif") {
+                } else if (attr[i] === 'proportionalSansSerif') {
 
-                    rslt.push("Arial");
-                    rslt.push("Helvetica");
+                    rslt.push('Arial');
+                    rslt.push('Helvetica');
                     rslt.push('"Liberation Sans"');
-                    rslt.push("sans-serif");
+                    rslt.push('sans-serif');
 
-                } else if (attr[i] === "monospace") {
+                } else if (attr[i] === 'monospace') {
 
-                    rslt.push("monospace");
+                    rslt.push('monospace');
 
-                } else if (attr[i] === "sansSerif") {
+                } else if (attr[i] === 'sansSerif') {
 
-                    rslt.push("sans-serif");
+                    rslt.push('sans-serif');
 
-                } else if (attr[i] === "serif") {
+                } else if (attr[i] === 'serif') {
 
-                    rslt.push("serif");
+                    rslt.push('serif');
 
-                } else if (attr[i] === "monospaceSansSerif") {
+                } else if (attr[i] === 'monospaceSansSerif') {
 
-                    rslt.push("Consolas");
-                    rslt.push("monospace");
+                    rslt.push('Consolas');
+                    rslt.push('monospace');
 
-                } else if (attr[i] === "proportionalSerif") {
+                } else if (attr[i] === 'proportionalSerif') {
 
-                    rslt.push("serif");
+                    rslt.push('serif');
 
                 } else {
 
@@ -1459,12 +1445,12 @@ var STYLING_MAP_DEFS = [
 
             }
 
-            // prune later duplicates we may have inserted 
+            // prune later duplicates we may have inserted
             if (rslt.length > 0) {
 
-                var unique = [rslt[0]];
+                const unique = [rslt[0]];
 
-                for (var fi = 1; fi < rslt.length; fi++) {
+                for (let fi = 1; fi < rslt.length; fi++) {
 
                     if (unique.indexOf(rslt[fi]) == -1) {
 
@@ -1476,12 +1462,12 @@ var STYLING_MAP_DEFS = [
                 rslt = unique;
             }
 
-            dom_element.style.fontFamily = rslt.join(",");
-        }
+            dom_element.style.fontFamily = rslt.join(',');
+        },
     ),
 
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling shear",
+        'http://www.w3.org/ns/ttml#styling shear',
         function (context, dom_element, isd_element, attr) {
 
             /* return immediately if tts:shear is 0% since CSS transforms are not inherited*/
@@ -1489,114 +1475,114 @@ var STYLING_MAP_DEFS = [
             if (attr === 0)
                 return;
 
-            var angle = attr * -0.9;
+            const angle = attr * -0.9;
 
             /* context.bpd is needed since writing mode is not inherited and sets the inline progression */
 
-            if (context.bpd === "tb") {
+            if (context.bpd === 'tb') {
 
-                dom_element.style.transform = "skewX(" + angle + "deg)";
+                dom_element.style.transform = 'skewX(' + angle + 'deg)';
 
             } else {
 
-                dom_element.style.transform = "skewY(" + angle + "deg)";
+                dom_element.style.transform = 'skewY(' + angle + 'deg)';
 
             }
 
-        }
+        },
     ),
 
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling fontSize",
+        'http://www.w3.org/ns/ttml#styling fontSize',
         function (context, dom_element, isd_element, attr) {
-            dom_element.style.fontSize = attr.toUsedLength(context.w, context.h) + "px";
-        }
+            dom_element.style.fontSize = attr.toUsedLength(context.w, context.h) + 'px';
+        },
     ),
 
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling fontStyle",
+        'http://www.w3.org/ns/ttml#styling fontStyle',
         function (context, dom_element, isd_element, attr) {
             dom_element.style.fontStyle = attr;
-        }
+        },
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling fontWeight",
+        'http://www.w3.org/ns/ttml#styling fontWeight',
         function (context, dom_element, isd_element, attr) {
             dom_element.style.fontWeight = attr;
-        }
+        },
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling lineHeight",
+        'http://www.w3.org/ns/ttml#styling lineHeight',
         function (context, dom_element, isd_element, attr) {
-            if (attr === "normal") {
+            if (attr === 'normal') {
 
-                dom_element.style.lineHeight = "normal";
+                dom_element.style.lineHeight = 'normal';
 
             } else {
 
-                dom_element.style.lineHeight = attr.toUsedLength(context.w, context.h) + "px";
+                dom_element.style.lineHeight = attr.toUsedLength(context.w, context.h) + 'px';
             }
-        }
+        },
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling opacity",
+        'http://www.w3.org/ns/ttml#styling opacity',
         function (context, dom_element, isd_element, attr) {
             dom_element.style.opacity = attr;
-        }
+        },
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling origin",
+        'http://www.w3.org/ns/ttml#styling origin',
         function (context, dom_element, isd_element, attr) {
-            dom_element.style.top = attr.h.toUsedLength(context.w, context.h) + "px";
-            dom_element.style.left = attr.w.toUsedLength(context.w, context.h) + "px";
-        }
+            dom_element.style.top = attr.h.toUsedLength(context.w, context.h) + 'px';
+            dom_element.style.left = attr.w.toUsedLength(context.w, context.h) + 'px';
+        },
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling overflow",
+        'http://www.w3.org/ns/ttml#styling overflow',
         function (context, dom_element, isd_element, attr) {
             dom_element.style.overflow = attr;
-        }
+        },
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling padding",
+        'http://www.w3.org/ns/ttml#styling padding',
         function (context, dom_element, isd_element, attr) {
 
             /* attr: top,left,bottom,right*/
 
             /* style: top right bottom left*/
 
-            var rslt = [];
+            const rslt = [];
 
-            rslt[0] = attr[0].toUsedLength(context.w, context.h) + "px";
-            rslt[1] = attr[3].toUsedLength(context.w, context.h) + "px";
-            rslt[2] = attr[2].toUsedLength(context.w, context.h) + "px";
-            rslt[3] = attr[1].toUsedLength(context.w, context.h) + "px";
+            rslt[0] = attr[0].toUsedLength(context.w, context.h) + 'px';
+            rslt[1] = attr[3].toUsedLength(context.w, context.h) + 'px';
+            rslt[2] = attr[2].toUsedLength(context.w, context.h) + 'px';
+            rslt[3] = attr[1].toUsedLength(context.w, context.h) + 'px';
 
-            dom_element.style.padding = rslt.join(" ");
-        }
+            dom_element.style.padding = rslt.join(' ');
+        },
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling position",
+        'http://www.w3.org/ns/ttml#styling position',
         function (context, dom_element, isd_element, attr) {
-            dom_element.style.top = attr.h.toUsedLength(context.w, context.h) + "px";
-            dom_element.style.left = attr.w.toUsedLength(context.w, context.h) + "px";
-        }
+            dom_element.style.top = attr.h.toUsedLength(context.w, context.h) + 'px';
+            dom_element.style.left = attr.w.toUsedLength(context.w, context.h) + 'px';
+        },
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling rubyAlign",
+        'http://www.w3.org/ns/ttml#styling rubyAlign',
         function (context, dom_element, isd_element, attr) {
-            dom_element.style.rubyAlign = attr === "spaceAround" ? "space-around" : "center";
-        }
+            dom_element.style.rubyAlign = attr === 'spaceAround' ? 'space-around' : 'center';
+        },
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling rubyPosition",
+        'http://www.w3.org/ns/ttml#styling rubyPosition',
         function (context, dom_element, isd_element, attr) {
 
             /* skip if "outside", which is handled by applyRubyPosition() */
 
-            if (attr === "before" || attr === "after") {
+            if (attr === 'before' || attr === 'after') {
 
-                var pos;
+                let pos;
 
                 if (RUBYPOSITION_ISWK) {
 
@@ -1604,20 +1590,19 @@ var STYLING_MAP_DEFS = [
 
                     pos = attr;
 
-                } else if (context.bpd === "tb") {
-
-                    pos = (attr === "before") ? "over" : "under";
+                } else if (context.bpd === 'tb') {
 
+                    pos = (attr === 'before') ? 'over' : 'under';
 
                 } else {
 
-                    if (context.bpd === "rl") {
+                    if (context.bpd === 'rl') {
 
-                        pos = (attr === "before") ? "over" : "under";
+                        pos = (attr === 'before') ? 'over' : 'under';
 
                     } else {
 
-                        pos = (attr === "before") ? "under" : "over";
+                        pos = (attr === 'before') ? 'under' : 'over';
 
                     }
 
@@ -1627,27 +1612,27 @@ var STYLING_MAP_DEFS = [
 
                 dom_element.parentElement.style[RUBYPOSITION_PROP] = pos;
             }
-        }
+        },
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling showBackground",
-        null
+        'http://www.w3.org/ns/ttml#styling showBackground',
+        null,
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling textAlign",
+        'http://www.w3.org/ns/ttml#styling textAlign',
         function (context, dom_element, isd_element, attr) {
 
-            var ta;
+            let ta;
 
             /* handle UAs that do not understand start or end */
 
-            if (attr === "start") {
+            if (attr === 'start') {
 
-                ta = (context.ipd === "rl") ? "right" : "left";
+                ta = (context.ipd === 'rl') ? 'right' : 'left';
 
-            } else if (attr === "end") {
+            } else if (attr === 'end') {
 
-                ta = (context.ipd === "rl") ? "left" : "right";
+                ta = (context.ipd === 'rl') ? 'left' : 'right';
 
             } else {
 
@@ -1657,200 +1642,197 @@ var STYLING_MAP_DEFS = [
 
             dom_element.style.textAlign = ta;
 
-        }
+        },
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling textDecoration",
+        'http://www.w3.org/ns/ttml#styling textDecoration',
         function (context, dom_element, isd_element, attr) {
-            dom_element.style.textDecoration = attr.join(" ").replace("lineThrough", "line-through");
-        }
+            dom_element.style.textDecoration = attr.join(' ').replace('lineThrough', 'line-through');
+        },
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling textOutline",
-        function (context, dom_element, isd_element, attr) {
+        'http://www.w3.org/ns/ttml#styling textOutline',
+        function () {
 
             /* defer to tts:textShadow */
-        }
+        },
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling textShadow",
+        'http://www.w3.org/ns/ttml#styling textShadow',
         function (context, dom_element, isd_element, attr) {
 
-            var txto = isd_element.styleAttrs[byName.textOutline.qname];
+            const txto = isd_element.styleAttrs[byName.textOutline.qname];
 
-            if (attr === "none" && txto === "none") {
+            if (attr === 'none' && txto === 'none') {
 
-                dom_element.style.textShadow = "";
+                dom_element.style.textShadow = '';
 
             } else {
 
-                var s = [];
+                const s = [];
 
-                if (txto !== "none") {
+                if (txto !== 'none') {
 
                     /* emulate text outline */
 
-                    var to_color = "rgba(" +
-                        txto.color[0].toString() + "," +
-                        txto.color[1].toString() + "," +
-                        txto.color[2].toString() + "," +
+                    const to_color = 'rgba(' +
+                        txto.color[0].toString() + ',' +
+                        txto.color[1].toString() + ',' +
+                        txto.color[2].toString() + ',' +
                         (txto.color[3] / 255).toString() +
-                        ")";
+                        ')';
 
-                    s.push("1px 1px 1px " + to_color);
-                    s.push("-1px 1px 1px " + to_color);
-                    s.push("1px -1px 1px " + to_color);
-                    s.push("-1px -1px 1px " + to_color);
+                    s.push('1px 1px 1px ' + to_color);
+                    s.push('-1px 1px 1px ' + to_color);
+                    s.push('1px -1px 1px ' + to_color);
+                    s.push('-1px -1px 1px ' + to_color);
 
                 }
 
                 /* add text shadow */
 
-                if (attr !== "none") {
-
-                    for (var i = 0; i < attr.length; i++) {
+                if (attr !== 'none') {
 
+                    for (let i = 0; i < attr.length; i++) {
 
-                        s.push(attr[i].x_off.toUsedLength(context.w, context.h) + "px " +
-                            attr[i].y_off.toUsedLength(context.w, context.h) + "px " +
-                            attr[i].b_radius.toUsedLength(context.w, context.h) + "px " +
-                            "rgba(" +
-                            attr[i].color[0].toString() + "," +
-                            attr[i].color[1].toString() + "," +
-                            attr[i].color[2].toString() + "," +
+                        s.push(attr[i].x_off.toUsedLength(context.w, context.h) + 'px ' +
+                            attr[i].y_off.toUsedLength(context.w, context.h) + 'px ' +
+                            attr[i].b_radius.toUsedLength(context.w, context.h) + 'px ' +
+                            'rgba(' +
+                            attr[i].color[0].toString() + ',' +
+                            attr[i].color[1].toString() + ',' +
+                            attr[i].color[2].toString() + ',' +
                             (attr[i].color[3] / 255).toString() +
-                            ")"
+                            ')',
                         );
 
                     }
 
                 }
 
-                dom_element.style.textShadow = s.join(",");
+                dom_element.style.textShadow = s.join(',');
 
             }
-        }
+        },
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling textCombine",
+        'http://www.w3.org/ns/ttml#styling textCombine',
         function (context, dom_element, isd_element, attr) {
 
             dom_element.style.textCombineUpright = attr;
 
-        }
+        },
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling textEmphasis",
-        function (context, dom_element, isd_element, attr) {
+        'http://www.w3.org/ns/ttml#styling textEmphasis',
+        function () {
 
             /* applied as part of HTML document construction */
 
-        }
+        },
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling unicodeBidi",
+        'http://www.w3.org/ns/ttml#styling unicodeBidi',
         function (context, dom_element, isd_element, attr) {
 
-            var ub;
+            let ub;
 
             if (attr === 'bidiOverride') {
-                ub = "bidi-override";
+                ub = 'bidi-override';
             } else {
                 ub = attr;
             }
 
             dom_element.style.unicodeBidi = ub;
-        }
+        },
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling visibility",
+        'http://www.w3.org/ns/ttml#styling visibility',
         function (context, dom_element, isd_element, attr) {
             dom_element.style.visibility = attr;
-        }
+        },
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling wrapOption",
+        'http://www.w3.org/ns/ttml#styling wrapOption',
         function (context, dom_element, isd_element, attr) {
 
-            if (attr === "wrap") {
+            if (attr === 'wrap') {
 
-                if (isd_element.space === "preserve") {
-                    dom_element.style.whiteSpace = "pre-wrap";
+                if (isd_element.space === 'preserve') {
+                    dom_element.style.whiteSpace = 'pre-wrap';
                 } else {
-                    dom_element.style.whiteSpace = "normal";
+                    dom_element.style.whiteSpace = 'normal';
                 }
 
             } else {
 
-                if (isd_element.space === "preserve") {
+                if (isd_element.space === 'preserve') {
 
-                    dom_element.style.whiteSpace = "pre";
+                    dom_element.style.whiteSpace = 'pre';
 
                 } else {
-                    dom_element.style.whiteSpace = "noWrap";
+                    dom_element.style.whiteSpace = 'noWrap';
                 }
 
             }
 
-        }
+        },
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling writingMode",
+        'http://www.w3.org/ns/ttml#styling writingMode',
         function (context, dom_element, isd_element, attr) {
 
-            var wm;
+            if (attr === 'lrtb' || attr === 'lr') {
 
-            if (attr === "lrtb" || attr === "lr") {
+                dom_element.style.writingMode = 'horizontal-tb';
 
-                dom_element.style.writingMode = "horizontal-tb";
+            } else if (attr === 'rltb' || attr === 'rl') {
 
-            } else if (attr === "rltb" || attr === "rl") {
+                dom_element.style.writingMode = 'horizontal-tb';
 
-                dom_element.style.writingMode = "horizontal-tb";
+            } else if (attr === 'tblr') {
 
-            } else if (attr === "tblr") {
+                dom_element.style.writingMode = 'vertical-lr';
 
-                dom_element.style.writingMode = "vertical-lr";
+            } else if (attr === 'tbrl' || attr === 'tb') {
 
-            } else if (attr === "tbrl" || attr === "tb") {
-
-                dom_element.style.writingMode = "vertical-rl";
+                dom_element.style.writingMode = 'vertical-rl';
 
             }
 
-        }
+        },
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml#styling zIndex",
+        'http://www.w3.org/ns/ttml#styling zIndex',
         function (context, dom_element, isd_element, attr) {
             dom_element.style.zIndex = attr;
-        }
+        },
     ),
     new HTMLStylingMapDefinition(
-        "http://www.w3.org/ns/ttml/profile/imsc1#styling forcedDisplay",
+        'http://www.w3.org/ns/ttml/profile/imsc1#styling forcedDisplay',
         function (context, dom_element, isd_element, attr) {
 
             if (context.displayForcedOnlyMode && attr === false) {
-                dom_element.style.visibility = "hidden";
+                dom_element.style.visibility = 'hidden';
             }
 
-        }
-    )
+        },
+    ),
 ];
 
-var STYLMAP_BY_QNAME = {};
+const STYLMAP_BY_QNAME = {};
 
-for (var i = 0; i < STYLING_MAP_DEFS.length; i++) {
+for (let i = 0; i < STYLING_MAP_DEFS.length; i++) {
 
     STYLMAP_BY_QNAME[STYLING_MAP_DEFS[i].qname] = STYLING_MAP_DEFS[i];
 }
 
 /* CSS property names */
 
-var RUBYPOSITION_ISWK = "webkitRubyPosition" in window.getComputedStyle(document.documentElement);
+const RUBYPOSITION_ISWK = 'webkitRubyPosition' in window.getComputedStyle(document.documentElement);
 
-var RUBYPOSITION_PROP = RUBYPOSITION_ISWK ? "webkitRubyPosition" : "rubyPosition";
+const RUBYPOSITION_PROP = RUBYPOSITION_ISWK ? 'webkitRubyPosition' : 'rubyPosition';
 
-var TEXTEMPHASISSTYLE_PROP = "webkitTextEmphasisStyle" in window.getComputedStyle(document.documentElement) ? "webkitTextEmphasisStyle" : "textEmphasisStyle";
+const TEXTEMPHASISSTYLE_PROP = 'webkitTextEmphasisStyle' in window.getComputedStyle(document.documentElement) ? 'webkitTextEmphasisStyle' : 'textEmphasisStyle';
 
-var TEXTEMPHASISPOSITION_PROP = "webkitTextEmphasisPosition" in window.getComputedStyle(document.documentElement) ? "webkitTextEmphasisPosition" : "textEmphasisPosition";
+const TEXTEMPHASISPOSITION_PROP = 'webkitTextEmphasisPosition' in window.getComputedStyle(document.documentElement) ? 'webkitTextEmphasisPosition' : 'textEmphasisPosition';
diff --git a/src/main/js/isd.js b/src/main/js/isd.js
index b2b766e0..3b03f12a 100644
--- a/src/main/js/isd.js
+++ b/src/main/js/isd.js
@@ -1,4 +1,4 @@
-/* 
+/*
  * Copyright (c) 2016, Pierre-Anthony Lemieux <pal@sandflow.com>
  * All rights reserved.
  *
@@ -25,16 +25,18 @@
  */
 
 import { reportError } from './error.js';
+import { all, byName, byQName } from './styles.js';
+import { ComputedLength, hasOwnProperty } from './utils.js';
 
 /**
  * @module imscISD
  */
 
-/** 
+/**
  * Creates a canonical representation of an IMSC1 document returned by <pre>imscDoc.fromXML()</pre>
  * at a given absolute offset in seconds. This offset does not have to be one of the values returned
  * by <pre>getMediaTimeEvents()</pre>.
- * 
+ *
  * @param {Object} tt IMSC1 document
  * @param {number} offset Absolute offset (in seconds)
  * @param {?module:imscUtils.ErrorHandler} errorHandler Error callback
@@ -47,28 +49,29 @@ export function generateISD(tt, offset, errorHandler) {
 
     /* create the ISD object from the IMSC1 doc */
 
-    var isd = new ISD(tt);
+    const isd = new ISD(tt);
 
     /* context */
 
-    var context = {
+    const context = {
 
         /*rubyfs: []*/ /* font size of the nearest textContainer or container */
 
     };
 
     /* Filter body contents - Only process what we need within the offset and discard regions not applicable to the content */
-    var body = {};
-    var activeRegions = {};
+    let body = {};
+    const activeRegions = {};
 
     /* gather any regions that might have showBackground="always" and show a background */
-    var initialShowBackground = tt.head.styling.initials[imscStyles.byName.showBackground.qname];
-    var initialbackgroundColor = tt.head.styling.initials[imscStyles.byName.backgroundColor.qname];
-    for (var layout_child in tt.head.layout.regions) {
-        if (tt.head.layout.regions.hasOwnProperty(layout_child)) {
-            var region = tt.head.layout.regions[layout_child];
-            var showBackground = region.styleAttrs[imscStyles.byName.showBackground.qname] || initialShowBackground;
-            var backgroundColor = region.styleAttrs[imscStyles.byName.backgroundColor.qname] || initialbackgroundColor;
+    const initialShowBackground = tt.head.styling.initials[byName.showBackground.qname];
+    const initialbackgroundColor = tt.head.styling.initials[byName.backgroundColor.qname];
+    const regions = tt.head.layout.regions;
+    for (const layout_child in regions) {
+        if (hasOwnProperty(regions, layout_child)) {
+            const region = regions[layout_child];
+            const showBackground = region.styleAttrs[byName.showBackground.qname] || initialShowBackground;
+            const backgroundColor = region.styleAttrs[byName.backgroundColor.qname] || initialbackgroundColor;
             activeRegions[region.id] = (
                 (showBackground === 'always' || showBackground === undefined) &&
                 backgroundColor !== undefined &&
@@ -89,16 +92,16 @@ export function generateISD(tt, offset, errorHandler) {
         }
 
         if (element.contents) {
-            var clone = {};
-            for (var prop in element) {
-                if (element.hasOwnProperty(prop)) {
+            const clone = {};
+            for (const prop in element) {
+                if (hasOwnProperty(element, prop)) {
                     clone[prop] = element[prop];
                 }
             }
             clone.contents = [];
 
             element.contents.filter(offsetFilter).forEach(function (el) {
-                var filteredElement = filter(offset, el);
+                const filteredElement = filter(offset, el);
                 if (filteredElement.regionID) {
                     activeRegions[filteredElement.regionID] = true;
                 }
@@ -120,16 +123,16 @@ export function generateISD(tt, offset, errorHandler) {
     }
 
     /* rewritten TTML will always have a default - this covers it. because the region is defaulted to "" */
-    if (activeRegions[""] !== undefined) {
-        activeRegions[""] = true;
+    if (activeRegions[''] !== undefined) {
+        activeRegions[''] = true;
     }
 
     /* process regions */
-    for (var regionID in activeRegions) {
+    for (const regionID in activeRegions) {
         if (activeRegions[regionID]) {
             /* post-order traversal of the body tree per [construct intermediate document] */
 
-            var c = isdProcessContentElement(tt, offset, tt.head.layout.regions[regionID], body, null, '', tt.head.layout.regions[regionID], errorHandler, context);
+            const c = isdProcessContentElement(tt, offset, tt.head.layout.regions[regionID], body, null, '', tt.head.layout.regions[regionID], errorHandler, context);
 
             if (c !== null) {
 
@@ -145,13 +148,13 @@ export function generateISD(tt, offset, errorHandler) {
 
 /* set of styles not applicable to ruby container spans */
 
-var _rcs_na_styles = [
-    imscStyles.byName.color.qname,
-    imscStyles.byName.textCombine.qname,
-    imscStyles.byName.textDecoration.qname,
-    imscStyles.byName.textEmphasis.qname,
-    imscStyles.byName.textOutline.qname,
-    imscStyles.byName.textShadow.qname
+const _rcs_na_styles = [
+    byName.color.qname,
+    byName.textCombine.qname,
+    byName.textDecoration.qname,
+    byName.textEmphasis.qname,
+    byName.textOutline.qname,
+    byName.textShadow.qname,
 ];
 
 function isdProcessContentElement(doc, offset, region, body, parent, inherited_region_id, elem, errorHandler, context) {
@@ -162,16 +165,16 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
         return null;
     }
 
-    /* 
-     * set the associated region as specified by the regionID attribute, or the 
+    /*
+     * set the associated region as specified by the regionID attribute, or the
      * inherited associated region otherwise
      */
 
-    var associated_region_id = 'regionID' in elem && elem.regionID !== '' ? elem.regionID : inherited_region_id;
+    const associated_region_id = 'regionID' in elem && elem.regionID !== '' ? elem.regionID : inherited_region_id;
 
     /* prune the element if either:
      * - the element is not terminal and the associated region is neither the default
-     *   region nor the parent region (this allows children to be associated with a 
+     *   region nor the parent region (this allows children to be associated with a
      *   region later on)
      * - the element is terminal and the associated region is not the parent region
      */
@@ -190,52 +193,53 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
 
     /* create an ISD element, including applying specified styles */
 
-    var isd_element = new ISDContentElement(elem);
+    const isd_element = new ISDContentElement(elem);
+    const styleAttrs = isd_element.styleAttrs;
 
     /* apply set (animation) styling */
 
-    if ("sets" in elem) {
-        for (var i = 0; i < elem.sets.length; i++) {
+    if ('sets' in elem) {
+        for (let i = 0; i < elem.sets.length; i++) {
 
             if (offset < elem.sets[i].begin || offset >= elem.sets[i].end)
                 continue;
 
-            isd_element.styleAttrs[elem.sets[i].qname] = elem.sets[i].value;
+            styleAttrs[elem.sets[i].qname] = elem.sets[i].value;
 
         }
     }
 
-    /* 
+    /*
      * keep track of specified styling attributes so that we
      * can compute them later
      */
 
-    var spec_attr = {};
+    const spec_attr = {};
 
-    for (var qname in isd_element.styleAttrs) {
+    for (const qname in styleAttrs) {
 
-        if (!isd_element.styleAttrs.hasOwnProperty(qname)) continue;
+        if (!hasOwnProperty(styleAttrs, qname)) continue;
 
         spec_attr[qname] = true;
 
         /* special rule for tts:writingMode (section 7.29.1 of XSL)
          * direction is set consistently with writingMode only
-         * if writingMode sets inline-direction to LTR or RTL  
+         * if writingMode sets inline-direction to LTR or RTL
          */
 
         if (isd_element.kind === 'region' &&
-            qname === imscStyles.byName.writingMode.qname &&
-            !(imscStyles.byName.direction.qname in isd_element.styleAttrs)) {
+            qname === byName.writingMode.qname &&
+            !(byName.direction.qname in styleAttrs)) {
 
-            var wm = isd_element.styleAttrs[qname];
+            const wm = styleAttrs[qname];
 
-            if (wm === "lrtb" || wm === "lr") {
+            if (wm === 'lrtb' || wm === 'lr') {
 
-                isd_element.styleAttrs[imscStyles.byName.direction.qname] = "ltr";
+                styleAttrs[byName.direction.qname] = 'ltr';
 
-            } else if (wm === "rltb" || wm === "rl") {
+            } else if (wm === 'rltb' || wm === 'rl') {
 
-                isd_element.styleAttrs[imscStyles.byName.direction.qname] = "rtl";
+                styleAttrs[byName.direction.qname] = 'rtl';
 
             }
 
@@ -246,96 +250,96 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
 
     if (parent !== null) {
 
-        for (var j = 0; j < imscStyles.all.length; j++) {
+        for (let j = 0; j < all.length; j++) {
 
-            var sa = imscStyles.all[j];
+            const sa = all[j];
 
             /* textDecoration has special inheritance rules */
 
-            if (sa.qname === imscStyles.byName.textDecoration.qname) {
+            if (sa.qname === byName.textDecoration.qname) {
 
                 /* handle both textDecoration inheritance and specification */
 
-                var ps = parent.styleAttrs[sa.qname];
-                var es = isd_element.styleAttrs[sa.qname];
-                var outs = [];
+                const ps = parent.styleAttrs[sa.qname];
+                const es = styleAttrs[sa.qname];
+                let outs = [];
 
                 if (es === undefined) {
 
                     outs = ps;
 
-                } else if (es.indexOf("none") === -1) {
+                } else if (es.indexOf('none') === -1) {
 
-                    if ((es.indexOf("noUnderline") === -1 &&
-                        ps.indexOf("underline") !== -1) ||
-                        es.indexOf("underline") !== -1) {
+                    if ((es.indexOf('noUnderline') === -1 &&
+                        ps.indexOf('underline') !== -1) ||
+                        es.indexOf('underline') !== -1) {
 
-                        outs.push("underline");
+                        outs.push('underline');
 
                     }
 
-                    if ((es.indexOf("noLineThrough") === -1 &&
-                        ps.indexOf("lineThrough") !== -1) ||
-                        es.indexOf("lineThrough") !== -1) {
+                    if ((es.indexOf('noLineThrough') === -1 &&
+                        ps.indexOf('lineThrough') !== -1) ||
+                        es.indexOf('lineThrough') !== -1) {
 
-                        outs.push("lineThrough");
+                        outs.push('lineThrough');
 
                     }
 
-                    if ((es.indexOf("noOverline") === -1 &&
-                        ps.indexOf("overline") !== -1) ||
-                        es.indexOf("overline") !== -1) {
+                    if ((es.indexOf('noOverline') === -1 &&
+                        ps.indexOf('overline') !== -1) ||
+                        es.indexOf('overline') !== -1) {
 
-                        outs.push("overline");
+                        outs.push('overline');
 
                     }
 
                 } else {
 
-                    outs.push("none");
+                    outs.push('none');
 
                 }
 
-                isd_element.styleAttrs[sa.qname] = outs;
+                styleAttrs[sa.qname] = outs;
 
-            } else if (sa.qname === imscStyles.byName.fontSize.qname &&
-                !(sa.qname in isd_element.styleAttrs) &&
+            } else if (sa.qname === byName.fontSize.qname &&
+                !(sa.qname in styleAttrs) &&
                 isd_element.kind === 'span' &&
-                isd_element.styleAttrs[imscStyles.byName.ruby.qname] === "textContainer") {
+                styleAttrs[byName.ruby.qname] === 'textContainer') {
 
                 /* special inheritance rule for ruby text container font size */
 
-                var ruby_fs = parent.styleAttrs[imscStyles.byName.fontSize.qname];
+                const ruby_fs = parent.styleAttrs[byName.fontSize.qname];
 
-                isd_element.styleAttrs[sa.qname] = new imscUtils.ComputedLength(
+                styleAttrs[sa.qname] = new ComputedLength(
                     0.5 * ruby_fs.rw,
                     0.5 * ruby_fs.rh);
 
-            } else if (sa.qname === imscStyles.byName.fontSize.qname &&
-                !(sa.qname in isd_element.styleAttrs) &&
+            } else if (sa.qname === byName.fontSize.qname &&
+                !(sa.qname in styleAttrs) &&
                 isd_element.kind === 'span' &&
-                isd_element.styleAttrs[imscStyles.byName.ruby.qname] === "text") {
+                styleAttrs[byName.ruby.qname] === 'text') {
 
                 /* special inheritance rule for ruby text font size */
 
-                var parent_fs = parent.styleAttrs[imscStyles.byName.fontSize.qname];
+                const parent_fs = parent.styleAttrs[byName.fontSize.qname];
 
-                if (parent.styleAttrs[imscStyles.byName.ruby.qname] === "textContainer") {
+                if (parent.styleAttrs[byName.ruby.qname] === 'textContainer') {
 
-                    isd_element.styleAttrs[sa.qname] = parent_fs;
+                    styleAttrs[sa.qname] = parent_fs;
 
                 } else {
 
-                    isd_element.styleAttrs[sa.qname] = new imscUtils.ComputedLength(
+                    styleAttrs[sa.qname] = new ComputedLength(
                         0.5 * parent_fs.rw,
                         0.5 * parent_fs.rh);
                 }
 
             } else if (sa.inherit &&
                 (sa.qname in parent.styleAttrs) &&
-                !(sa.qname in isd_element.styleAttrs)) {
+                !(sa.qname in styleAttrs)) {
 
-                isd_element.styleAttrs[sa.qname] = parent.styleAttrs[sa.qname];
+                styleAttrs[sa.qname] = parent.styleAttrs[sa.qname];
 
             }
 
@@ -345,29 +349,29 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
 
     /* initial value styling */
 
-    for (var k = 0; k < imscStyles.all.length; k++) {
+    for (let k = 0; k < all.length; k++) {
 
-        var ivs = imscStyles.all[k];
+        const ivs = all[k];
 
         /* skip if value is already specified */
 
-        if (ivs.qname in isd_element.styleAttrs) continue;
+        if (ivs.qname in styleAttrs) continue;
 
         /* skip tts:position if tts:origin is specified */
 
-        if (ivs.qname === imscStyles.byName.position.qname &&
-            imscStyles.byName.origin.qname in isd_element.styleAttrs)
+        if (ivs.qname === byName.position.qname &&
+            byName.origin.qname in styleAttrs)
             continue;
 
         /* skip tts:origin if tts:position is specified */
 
-        if (ivs.qname === imscStyles.byName.origin.qname &&
-            imscStyles.byName.position.qname in isd_element.styleAttrs)
+        if (ivs.qname === byName.origin.qname &&
+            byName.position.qname in styleAttrs)
             continue;
 
         /* determine initial value */
 
-        var iv = doc.head.styling.initials[ivs.qname] || ivs.initial;
+        const iv = doc.head.styling.initials[ivs.qname] || ivs.initial;
 
         if (iv === null) {
             /* skip processing if no initial value defined */
@@ -379,11 +383,11 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
 
         if (isd_element.kind === 'region' || (ivs.inherit === false && iv !== null)) {
 
-            var piv = ivs.parse(iv);
+            const piv = ivs.parse(iv);
 
             if (piv !== null) {
 
-                isd_element.styleAttrs[ivs.qname] = piv;
+                styleAttrs[ivs.qname] = piv;
 
                 /* keep track of the style as specified */
 
@@ -402,37 +406,37 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
     /* compute styles (only for non-inherited styles) */
     /* TODO: get rid of spec_attr */
 
-    for (var z = 0; z < imscStyles.all.length; z++) {
+    for (let z = 0; z < all.length; z++) {
 
-        var cs = imscStyles.all[z];
+        const cs = all[z];
 
         if (!(cs.qname in spec_attr)) continue;
 
         if (cs.compute !== null) {
 
-            var cstyle = cs.compute(
+            const cstyle = cs.compute(
                 /*doc, parent, element, attr, context*/
                 doc,
                 parent,
                 isd_element,
-                isd_element.styleAttrs[cs.qname],
-                context
+                styleAttrs[cs.qname],
+                context,
             );
 
             if (cstyle !== null) {
 
-                isd_element.styleAttrs[cs.qname] = cstyle;
+                styleAttrs[cs.qname] = cstyle;
 
             } else {
                 /* if the style cannot be computed, replace it by its initial value */
 
-                isd_element.styleAttrs[cs.qname] = cs.compute(
+                styleAttrs[cs.qname] = cs.compute(
                     /*doc, parent, element, attr, context*/
                     doc,
                     parent,
                     isd_element,
                     cs.parse(cs.initial),
-                    context
+                    context,
                 );
 
                 reportError(errorHandler, "Style '" + cs.qname + "' on element '" + isd_element.kind + "' cannot be computed");
@@ -443,12 +447,12 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
 
     /* prune if tts:display is none */
 
-    if (isd_element.styleAttrs[imscStyles.byName.display.qname] === "none")
+    if (styleAttrs[byName.display.qname] === 'none')
         return null;
 
     /* process contents of the element */
 
-    var contents = null;
+    let contents = null;
 
     if (parent === null) {
 
@@ -474,12 +478,12 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
 
     }
 
-    for (var x = 0; contents !== null && x < contents.length; x++) {
+    for (let x = 0; contents !== null && x < contents.length; x++) {
 
-        var c = isdProcessContentElement(doc, offset, region, body, isd_element, associated_region_id, contents[x], errorHandler, context);
+        const c = isdProcessContentElement(doc, offset, region, body, isd_element, associated_region_id, contents[x], errorHandler, context);
 
-        /* 
-         * keep child element only if they are non-null and their region match 
+        /*
+         * keep child element only if they are non-null and their region match
          * the region of this element
          */
 
@@ -493,19 +497,19 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
 
     /* remove styles that are not applicable */
 
-    for (var qnameb in isd_element.styleAttrs) {
-        if (!isd_element.styleAttrs.hasOwnProperty(qnameb)) continue;
+    for (const qnameb in styleAttrs) {
+        if (!hasOwnProperty(styleAttrs, qnameb)) continue;
 
         /* true if not applicable */
 
-        var na = false;
+        let na = false;
 
         /* special applicability of certain style properties to ruby container spans */
         /* TODO: in the future ruby elements should be translated to elements instead of kept as spans */
 
         if (isd_element.kind === 'span') {
 
-            var rsp = isd_element.styleAttrs[imscStyles.byName.ruby.qname];
+            const rsp = styleAttrs[byName.ruby.qname];
 
             na = (rsp === 'container' || rsp === 'textContainer' || rsp === 'baseContainer') &&
                 _rcs_na_styles.indexOf(qnameb) !== -1;
@@ -513,14 +517,14 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
             if (!na) {
 
                 na = rsp !== 'container' &&
-                    qnameb === imscStyles.byName.rubyAlign.qname;
+                    qnameb === byName.rubyAlign.qname;
 
             }
 
             if (!na) {
 
                 na = (!(rsp === 'textContainer' || rsp === 'text')) &&
-                    qnameb === imscStyles.byName.rubyPosition.qname;
+                    qnameb === byName.rubyPosition.qname;
 
             }
 
@@ -530,9 +534,9 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
 
         if (!na) {
 
-            var da = imscStyles.byQName[qnameb];
+            const da = byQName[qnameb];
 
-            if ("applies" in da) {
+            if ('applies' in da) {
 
                 na = da.applies.indexOf(isd_element.kind) === -1;
 
@@ -540,22 +544,21 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
 
         }
 
-
         if (na) {
-            delete isd_element.styleAttrs[qnameb];
+            delete styleAttrs[qnameb];
         }
 
     }
 
     /* trim whitespace around explicit line breaks */
 
-    var ruby = isd_element.styleAttrs[imscStyles.byName.ruby.qname];
+    const ruby = styleAttrs[byName.ruby.qname];
 
     if (isd_element.kind === 'p' ||
-        (isd_element.kind === 'span' && (ruby === "textContainer" || ruby === "text"))
+        (isd_element.kind === 'span' && (ruby === 'textContainer' || ruby === 'text'))
     ) {
 
-        var elist = [];
+        const elist = [];
 
         constructSpanList(isd_element, elist);
 
@@ -574,17 +577,17 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
      * * if region and showBackground = always
      */
 
-    if ((isd_element.kind === 'div' && imscStyles.byName.backgroundImage.qname in isd_element.styleAttrs) ||
+    if ((isd_element.kind === 'div' && byName.backgroundImage.qname in styleAttrs) ||
         isd_element.kind === 'br' ||
         isd_element.kind === 'image' ||
         ('contents' in isd_element && isd_element.contents.length > 0) ||
         (isd_element.kind === 'span' && isd_element.text !== null) ||
         (isd_element.kind === 'region' &&
-            isd_element.styleAttrs[imscStyles.byName.showBackground.qname] === 'always')) {
+            styleAttrs[byName.showBackground.qname] === 'always')) {
 
         return {
             region_id: associated_region_id,
-            element: isd_element
+            element: isd_element,
         };
     }
 
@@ -598,23 +601,23 @@ function collapseLWSP(elist) {
     }
 
     function isNextCharLWSP(next_element) {
-        return next_element.kind === 'br' || (next_element.space === "preserve" && /^[\r\n]/.test(next_element.text));
+        return next_element.kind === 'br' || (next_element.space === 'preserve' && /^[\r\n]/.test(next_element.text));
     }
 
     /* collapse spaces and remove leading LWSPs */
 
-    var element;
+    let element;
 
-    for (var i = 0; i < elist.length;) {
+    for (let i = 0; i < elist.length;) {
 
         element = elist[i];
 
-        if (element.kind === "br" || element.space === "preserve") {
+        if (element.kind === 'br' || element.space === 'preserve') {
             i++;
             continue;
         }
 
-        var trimmed_text = element.text.replace(/[\t\r\n ]+/g, ' ');
+        let trimmed_text = element.text.replace(/[\t\r\n ]+/g, ' ');
 
         if (/^[ ]/.test(trimmed_text)) {
 
@@ -636,11 +639,11 @@ function collapseLWSP(elist) {
 
     /* remove trailing LWSPs */
 
-    for (i = 0; i < elist.length; i++) {
+    for (let i = 0; i < elist.length; i++) {
 
         element = elist[i];
 
-        if (element.kind === "br" || element.space === "preserve") {
+        if (element.kind === 'br' || element.space === 'preserve') {
             i++;
             continue;
         }
@@ -659,16 +662,16 @@ function collapseLWSP(elist) {
 
 function constructSpanList(element, elist) {
 
-    if (!("contents" in element)) {
+    if (!('contents' in element)) {
         return;
     }
 
-    for (var i = 0; i < element.contents.length; i++) {
+    for (let i = 0; i < element.contents.length; i++) {
 
-        var child = element.contents[i];
-        var ruby = child.styleAttrs[imscStyles.byName.ruby.qname];
+        const child = element.contents[i];
+        const ruby = child.styleAttrs[byName.ruby.qname];
 
-        if (child.kind === 'span' && (ruby === "textContainer" || ruby === "text")) {
+        if (child.kind === 'span' && (ruby === 'textContainer' || ruby === 'text')) {
 
             /* skip ruby text and text containers, which are handled on their own */
 
@@ -702,7 +705,7 @@ function pruneEmptySpans(element) {
 
     } else if ('contents' in element) {
 
-        var i = element.contents.length;
+        let i = element.contents.length;
 
         while (i--) {
 
@@ -745,9 +748,9 @@ class ISDContentElement {
         /* deep copy of style attributes */
         this.styleAttrs = {};
 
-        for (var sname in ttelem.styleAttrs) {
+        for (const sname in ttelem.styleAttrs) {
 
-            if (!ttelem.styleAttrs.hasOwnProperty(sname)) continue;
+            if (!hasOwnProperty(ttelem.styleAttrs, sname)) continue;
 
             this.styleAttrs[sname] =
                 ttelem.styleAttrs[sname];
@@ -767,7 +770,7 @@ class ISDContentElement {
 
         }
 
-        /* TODO: clean this! 
+        /* TODO: clean this!
          * TODO: ISDElement and document element should be better tied together */
 
         if ('text' in ttelem) {
diff --git a/src/main/js/main.js b/src/main/js/main.js
index b7f2c0f1..02911abb 100644
--- a/src/main/js/main.js
+++ b/src/main/js/main.js
@@ -1,4 +1,4 @@
-/* 
+/*
  * Copyright (c) 2016, Pierre-Anthony Lemieux <pal@sandflow.com>
  * All rights reserved.
  *
@@ -25,5 +25,5 @@
  */
 
 export { fromXML } from './doc.js';
-export { renderHTML } from "./html.js";
+export { renderHTML } from './html.js';
 export { generateISD } from './isd.js';
diff --git a/src/main/js/names.js b/src/main/js/names.js
index e68c492a..2ea18d81 100644
--- a/src/main/js/names.js
+++ b/src/main/js/names.js
@@ -1,4 +1,4 @@
-/* 
+/*
  * Copyright (c) 2016, Pierre-Anthony Lemieux <pal@sandflow.com>
  * All rights reserved.
  *
@@ -28,11 +28,11 @@
  * @module imscNames
  */
 
-export const ns_tt = "http://www.w3.org/ns/ttml";
-export const ns_tts = "http://www.w3.org/ns/ttml#styling";
-export const ns_ttp = "http://www.w3.org/ns/ttml#parameter";
-export const ns_xml = "http://www.w3.org/XML/1998/namespace";
-export const ns_itts = "http://www.w3.org/ns/ttml/profile/imsc1#styling";
-export const ns_ittp = "http://www.w3.org/ns/ttml/profile/imsc1#parameter";
-export const ns_smpte = "http://www.smpte-ra.org/schemas/2052-1/2010/smpte-tt";
-export const ns_ebutts = "urn:ebu:tt:style";
+export const ns_tt = 'http://www.w3.org/ns/ttml';
+export const ns_tts = 'http://www.w3.org/ns/ttml#styling';
+export const ns_ttp = 'http://www.w3.org/ns/ttml#parameter';
+export const ns_xml = 'http://www.w3.org/XML/1998/namespace';
+export const ns_itts = 'http://www.w3.org/ns/ttml/profile/imsc1#styling';
+export const ns_ittp = 'http://www.w3.org/ns/ttml/profile/imsc1#parameter';
+export const ns_smpte = 'http://www.smpte-ra.org/schemas/2052-1/2010/smpte-tt';
+export const ns_ebutts = 'urn:ebu:tt:style';
diff --git a/src/main/js/styles.js b/src/main/js/styles.js
index 6de1a660..9c806b26 100644
--- a/src/main/js/styles.js
+++ b/src/main/js/styles.js
@@ -1,4 +1,4 @@
-/* 
+/*
  * Copyright (c) 2016, Pierre-Anthony Lemieux <pal@sandflow.com>
  * All rights reserved.
  *
@@ -35,7 +35,7 @@ class StylingAttributeDefinition {
     constructor(ns, name, initialValue, appliesTo, isInherit, isAnimatable, parseFunc, computeFunc) {
         this.name = name;
         this.ns = ns;
-        this.qname = ns + " " + name;
+        this.qname = ns + ' ' + name;
         this.inherit = isInherit;
         this.animatable = isAnimatable;
         this.initial = initialValue;
@@ -49,92 +49,92 @@ export const all = [
 
     new StylingAttributeDefinition(
         ns_tts,
-        "backgroundColor",
-        "transparent",
+        'backgroundColor',
+        'transparent',
         ['body', 'div', 'p', 'region', 'span'],
         false,
         true,
         parseColor,
-        null
+        null,
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "color",
-        "white",
+        'color',
+        'white',
         ['span'],
         true,
         true,
         parseColor,
-        null
+        null,
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "direction",
-        "ltr",
+        'direction',
+        'ltr',
         ['p', 'span'],
         true,
         true,
         function (str) {
             return str;
         },
-        null
+        null,
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "display",
-        "auto",
+        'display',
+        'auto',
         ['body', 'div', 'p', 'region', 'span'],
         false,
         true,
         function (str) {
             return str;
         },
-        null
+        null,
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "displayAlign",
-        "before",
+        'displayAlign',
+        'before',
         ['region'],
         false,
         true,
         function (str) {
             return str;
         },
-        null
+        null,
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "extent",
-        "auto",
+        'extent',
+        'auto',
         ['tt', 'region'],
         false,
         true,
         function (str) {
 
-            if (str === "auto") {
+            if (str === 'auto') {
 
                 return str;
 
             } else {
 
-                var s = str.split(" ");
+                const s = str.split(' ');
                 if (s.length !== 2)
                     return null;
-                var w = parseLength(s[0]);
-                var h = parseLength(s[1]);
+                const w = parseLength(s[0]);
+                const h = parseLength(s[1]);
                 if (!h || !w)
                     return null;
                 return { 'h': h, 'w': w };
             }
 
         },
-        function (doc, parent, element, attr, context) {
+        function (doc, parent, element, attr) {
 
-            var h;
-            var w;
+            let h;
+            let w;
 
-            if (attr === "auto") {
+            if (attr === 'auto') {
 
                 h = new ComputedLength(0, 1);
 
@@ -146,10 +146,9 @@ export const all = [
                     null,
                     doc.dimensions.h,
                     null,
-                    doc.pxLength.h
+                    doc.pxLength.h,
                 );
 
-
                 if (h === null) {
 
                     return null;
@@ -157,7 +156,7 @@ export const all = [
                 }
             }
 
-            if (attr === "auto") {
+            if (attr === 'auto') {
 
                 w = new ComputedLength(1, 0);
 
@@ -169,7 +168,7 @@ export const all = [
                     null,
                     doc.dimensions.w,
                     null,
-                    doc.pxLength.w
+                    doc.pxLength.w,
                 );
 
                 if (w === null) {
@@ -181,29 +180,29 @@ export const all = [
             }
 
             return { 'h': h, 'w': w };
-        }
+        },
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "fontFamily",
-        "default",
+        'fontFamily',
+        'default',
         ['span', 'p'],
         true,
         true,
         function (str) {
-            var ffs = str.split(",");
-            var rslt = [];
+            const ffs = str.split(',');
+            const rslt = [];
 
-            for (var i = 0; i < ffs.length; i++) {
+            for (let i = 0; i < ffs.length; i++) {
                 ffs[i] = ffs[i].trim();
 
                 if (ffs[i].charAt(0) !== "'" && ffs[i].charAt(0) !== '"') {
 
-                    if (ffs[i] === "default") {
+                    if (ffs[i] === 'default') {
 
                         /* per IMSC1 */
 
-                        rslt.push("monospaceSerif");
+                        rslt.push('monospaceSerif');
 
                     } else {
 
@@ -221,21 +220,21 @@ export const all = [
 
             return rslt;
         },
-        null
+        null,
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "shear",
-        "0%",
+        'shear',
+        '0%',
         ['p'],
         true,
         true,
         parseLength,
         function (doc, parent, element, attr) {
 
-            var fs;
+            let fs;
 
-            if (attr.unit === "%") {
+            if (attr.unit === '%') {
 
                 fs = Math.abs(attr.value) > 100 ? Math.sign(attr.value) * 100 : attr.value;
 
@@ -246,36 +245,33 @@ export const all = [
             }
 
             return fs;
-        }
+        },
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "fontSize",
-        "1c",
+        'fontSize',
+        '1c',
         ['span', 'p'],
         true,
         true,
         parseLength,
-        function (doc, parent, element, attr, context) {
-
-            var fs;
-
-            fs = toComputedLength(
+        function (doc, parent, element, attr) {
+            const fs = toComputedLength(
                 attr.value,
                 attr.unit,
                 parent !== null ? parent.styleAttrs[byName.fontSize.qname] : doc.cellLength.h,
                 parent !== null ? parent.styleAttrs[byName.fontSize.qname] : doc.cellLength.h,
                 doc.cellLength.h,
-                doc.pxLength.h
+                doc.pxLength.h,
             );
 
             return fs;
-        }
+        },
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "fontStyle",
-        "normal",
+        'fontStyle',
+        'normal',
         ['span', 'p'],
         true,
         true,
@@ -284,12 +280,12 @@ export const all = [
 
             return str;
         },
-        null
+        null,
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "fontWeight",
-        "normal",
+        'fontWeight',
+        'normal',
         ['span', 'p'],
         true,
         true,
@@ -298,27 +294,27 @@ export const all = [
 
             return str;
         },
-        null
+        null,
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "lineHeight",
-        "normal",
+        'lineHeight',
+        'normal',
         ['p'],
         true,
         true,
         function (str) {
-            if (str === "normal") {
+            if (str === 'normal') {
                 return str;
             } else {
                 return parseLength(str);
             }
         },
-        function (doc, parent, element, attr, context) {
+        function (doc, parent, element, attr) {
 
-            var lh;
+            let lh;
 
-            if (attr === "normal") {
+            if (attr === 'normal') {
 
                 /* inherit normal per https://github.com/w3c/ttml1/issues/220 */
 
@@ -332,7 +328,7 @@ export const all = [
                     element.styleAttrs[byName.fontSize.qname],
                     element.styleAttrs[byName.fontSize.qname],
                     doc.cellLength.h,
-                    doc.pxLength.h
+                    doc.pxLength.h,
                 );
 
                 if (lh === null) {
@@ -346,50 +342,50 @@ export const all = [
             /* TODO: create a Length constructor */
 
             return lh;
-        }
+        },
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "opacity",
+        'opacity',
         1.0,
         ['region'],
         false,
         true,
         parseFloat,
-        null
+        null,
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "origin",
-        "auto",
+        'origin',
+        'auto',
         ['region'],
         false,
         true,
         function (str) {
 
-            if (str === "auto") {
+            if (str === 'auto') {
 
                 return str;
 
             } else {
 
-                var s = str.split(" ");
+                const s = str.split(' ');
                 if (s.length !== 2)
                     return null;
-                var w = parseLength(s[0]);
-                var h = parseLength(s[1]);
+                const w = parseLength(s[0]);
+                const h = parseLength(s[1]);
                 if (!h || !w)
                     return null;
                 return { 'h': h, 'w': w };
             }
 
         },
-        function (doc, parent, element, attr, context) {
+        function (doc, parent, element, attr) {
 
-            var h;
-            var w;
+            let h;
+            let w;
 
-            if (attr === "auto") {
+            if (attr === 'auto') {
 
                 h = new ComputedLength(0, 0);
 
@@ -401,7 +397,7 @@ export const all = [
                     null,
                     doc.dimensions.h,
                     null,
-                    doc.pxLength.h
+                    doc.pxLength.h,
                 );
 
                 if (h === null) {
@@ -412,7 +408,7 @@ export const all = [
 
             }
 
-            if (attr === "auto") {
+            if (attr === 'auto') {
 
                 w = new ComputedLength(0, 0);
 
@@ -424,7 +420,7 @@ export const all = [
                     null,
                     doc.dimensions.w,
                     null,
-                    doc.pxLength.w
+                    doc.pxLength.w,
                 );
 
                 if (w === null) {
@@ -436,36 +432,36 @@ export const all = [
             }
 
             return { 'h': h, 'w': w };
-        }
+        },
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "overflow",
-        "hidden",
+        'overflow',
+        'hidden',
         ['region'],
         false,
         true,
         function (str) {
             return str;
         },
-        null
+        null,
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "padding",
-        "0px",
+        'padding',
+        '0px',
         ['region'],
         false,
         true,
         function (str) {
 
-            var s = str.split(" ");
+            const s = str.split(' ');
             if (s.length > 4)
                 return null;
-            var r = [];
-            for (var i = 0; i < s.length; i++) {
+            const r = [];
+            for (let i = 0; i < s.length; i++) {
 
-                var l = parseLength(s[i]);
+                const l = parseLength(s[i]);
                 if (!l)
                     return null;
                 r.push(l);
@@ -473,16 +469,16 @@ export const all = [
 
             return r;
         },
-        function (doc, parent, element, attr, context) {
+        function (doc, parent, element, attr) {
 
-            var padding;
+            let padding;
 
             /* TODO: make sure we are in region */
 
             /*
-             * expand padding shortcuts to 
+             * expand padding shortcuts to
              * [before, end, after, start]
-             * 
+             *
              */
 
             if (attr.length === 1) {
@@ -509,27 +505,27 @@ export const all = [
 
             /* TODO: take into account tts:direction */
 
-            /* 
-             * transform [before, end, after, start] according to writingMode to 
+            /*
+             * transform [before, end, after, start] according to writingMode to
              * [top,left,bottom,right]
-             * 
+             *
              */
 
-            var dir = element.styleAttrs[byName.writingMode.qname];
+            const dir = element.styleAttrs[byName.writingMode.qname];
 
-            if (dir === "lrtb" || dir === "lr") {
+            if (dir === 'lrtb' || dir === 'lr') {
 
                 padding = [padding[0], padding[3], padding[2], padding[1]];
 
-            } else if (dir === "rltb" || dir === "rl") {
+            } else if (dir === 'rltb' || dir === 'rl') {
 
                 padding = [padding[0], padding[1], padding[2], padding[3]];
 
-            } else if (dir === "tblr") {
+            } else if (dir === 'tblr') {
 
                 padding = [padding[3], padding[0], padding[1], padding[2]];
 
-            } else if (dir === "tbrl" || dir === "tb") {
+            } else if (dir === 'tbrl' || dir === 'tb') {
 
                 padding = [padding[3], padding[2], padding[1], padding[0]];
 
@@ -539,9 +535,9 @@ export const all = [
 
             }
 
-            var out = [];
+            const out = [];
 
-            for (var i = 0; i < padding.length; i++) {
+            for (let i = 0; i < padding.length; i++) {
 
                 if (padding[i].value === 0) {
 
@@ -555,7 +551,7 @@ export const all = [
                         element.styleAttrs[byName.fontSize.qname],
                         i === 0 || i === 2 ? element.styleAttrs[byName.extent.qname].h : element.styleAttrs[byName.extent.qname].w,
                         i === 0 || i === 2 ? doc.cellLength.h : doc.cellLength.w,
-                        i === 0 || i === 2 ? doc.pxLength.h : doc.pxLength.w
+                        i === 0 || i === 2 ? doc.pxLength.h : doc.pxLength.w,
                     );
 
                     if (out[i] === null) return null;
@@ -563,14 +559,13 @@ export const all = [
                 }
             }
 
-
             return out;
-        }
+        },
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "position",
-        "top left",
+        'position',
+        'top left',
         ['region'],
         false,
         true,
@@ -580,8 +575,8 @@ export const all = [
 
         },
         function (doc, parent, element, attr) {
-            var h;
-            var w;
+            let h;
+            let w;
 
             h = toComputedLength(
                 attr.v.offset.value,
@@ -589,20 +584,19 @@ export const all = [
                 null,
                 new ComputedLength(
                     - element.styleAttrs[byName.extent.qname].h.rw,
-                    doc.dimensions.h.rh - element.styleAttrs[byName.extent.qname].h.rh
+                    doc.dimensions.h.rh - element.styleAttrs[byName.extent.qname].h.rh,
                 ),
                 null,
-                doc.pxLength.h
+                doc.pxLength.h,
             );
 
             if (h === null) return null;
 
-
-            if (attr.v.edge === "bottom") {
+            if (attr.v.edge === 'bottom') {
 
                 h = new ComputedLength(
                     - h.rw - element.styleAttrs[byName.extent.qname].h.rw,
-                    doc.dimensions.h.rh - h.rh - element.styleAttrs[byName.extent.qname].h.rh
+                    doc.dimensions.h.rh - h.rh - element.styleAttrs[byName.extent.qname].h.rh,
                 );
 
             }
@@ -613,87 +607,87 @@ export const all = [
                 null,
                 new ComputedLength(
                     doc.dimensions.w.rw - element.styleAttrs[byName.extent.qname].w.rw,
-                    - element.styleAttrs[byName.extent.qname].w.rh
+                    - element.styleAttrs[byName.extent.qname].w.rh,
                 ),
                 null,
-                doc.pxLength.w
+                doc.pxLength.w,
             );
 
             if (h === null) return null;
 
-            if (attr.h.edge === "right") {
+            if (attr.h.edge === 'right') {
 
                 w = new ComputedLength(
                     doc.dimensions.w.rw - w.rw - element.styleAttrs[byName.extent.qname].w.rw,
-                    - w.rh - element.styleAttrs[byName.extent.qname].w.rh
+                    - w.rh - element.styleAttrs[byName.extent.qname].w.rh,
                 );
 
             }
 
             return { 'h': h, 'w': w };
-        }
+        },
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "ruby",
-        "none",
+        'ruby',
+        'none',
         ['span'],
         false,
         true,
         function (str) {
             return str;
         },
-        null
+        null,
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "rubyAlign",
-        "center",
+        'rubyAlign',
+        'center',
         ['span'],
         true,
         true,
         function (str) {
 
-            if (!(str === "center" || str === "spaceAround")) {
+            if (!(str === 'center' || str === 'spaceAround')) {
                 return null;
             }
 
             return str;
         },
-        null
+        null,
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "rubyPosition",
-        "outside",
+        'rubyPosition',
+        'outside',
         ['span'],
         true,
         true,
         function (str) {
             return str;
         },
-        null
+        null,
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "rubyReserve",
-        "none",
+        'rubyReserve',
+        'none',
         ['p'],
         true,
         true,
         function (str) {
-            var s = str.split(" ");
+            const s = str.split(' ');
 
-            var r = [null, null];
+            const r = [null, null];
 
             if (s.length === 0 || s.length > 2)
                 return null;
 
-            if (s[0] === "none" ||
-                s[0] === "both" ||
-                s[0] === "after" ||
-                s[0] === "before" ||
-                s[0] === "outside") {
+            if (s[0] === 'none' ||
+                s[0] === 'both' ||
+                s[0] === 'after' ||
+                s[0] === 'before' ||
+                s[0] === 'outside') {
 
                 r[0] = s[0];
 
@@ -703,9 +697,9 @@ export const all = [
 
             }
 
-            if (s.length === 2 && s[0] !== "none") {
+            if (s.length === 2 && s[0] !== 'none') {
 
-                var l = parseLength(s[1]);
+                const l = parseLength(s[1]);
 
                 if (l) {
 
@@ -719,24 +713,23 @@ export const all = [
 
             }
 
-
             return r;
         },
-        function (doc, parent, element, attr, context) {
+        function (doc, parent, element, attr) {
 
-            if (attr[0] === "none") {
+            if (attr[0] === 'none') {
 
                 return attr;
 
             }
 
-            var fs = null;
+            let fs = null;
 
             if (attr[1] === null) {
 
                 fs = new ComputedLength(
                     element.styleAttrs[byName.fontSize.qname].rw * 0.5,
-                    element.styleAttrs[byName.fontSize.qname].rh * 0.5
+                    element.styleAttrs[byName.fontSize.qname].rh * 0.5,
                 );
 
             } else {
@@ -746,7 +739,7 @@ export const all = [
                     element.styleAttrs[byName.fontSize.qname],
                     element.styleAttrs[byName.fontSize.qname],
                     doc.cellLength.h,
-                    doc.pxLength.h
+                    doc.pxLength.h,
                 );
 
             }
@@ -754,111 +747,111 @@ export const all = [
             if (fs === null) return null;
 
             return [attr[0], fs];
-        }
+        },
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "showBackground",
-        "always",
+        'showBackground',
+        'always',
         ['region'],
         false,
         true,
         function (str) {
             return str;
         },
-        null
+        null,
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "textAlign",
-        "start",
+        'textAlign',
+        'start',
         ['p'],
         true,
         true,
         function (str) {
             return str;
         },
-        function (doc, parent, element, attr, context) {
+        function (doc, parent, element, attr) {
             /* Section 7.16.9 of XSL */
 
-            if (attr === "left") {
+            if (attr === 'left') {
 
-                return "start";
+                return 'start';
 
-            } else if (attr === "right") {
+            } else if (attr === 'right') {
 
-                return "end";
+                return 'end';
 
             } else {
 
                 return attr;
 
             }
-        }
+        },
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "textCombine",
-        "none",
+        'textCombine',
+        'none',
         ['span'],
         true,
         true,
         function (str) {
-            if (str === "none" || str === "all") {
+            if (str === 'none' || str === 'all') {
 
                 return str;
             }
 
             return null;
         },
-        null
+        null,
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "textDecoration",
-        "none",
+        'textDecoration',
+        'none',
         ['span'],
         true,
         true,
         function (str) {
-            return str.split(" ");
+            return str.split(' ');
         },
-        null
+        null,
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "textEmphasis",
-        "none",
+        'textEmphasis',
+        'none',
         ['span'],
         true,
         true,
         function (str) {
-            var e = str.split(" ");
+            const e = str.split(' ');
 
-            var rslt = { style: null, symbol: null, color: null, position: null };
+            const rslt = { style: null, symbol: null, color: null, position: null };
 
-            for (var i = 0; i < e.length; i++) {
+            for (let i = 0; i < e.length; i++) {
 
-                if (e[i] === "none" || e[i] === "auto") {
+                if (e[i] === 'none' || e[i] === 'auto') {
 
                     rslt.style = e[i];
 
-                } else if (e[i] === "filled" ||
-                    e[i] === "open") {
+                } else if (e[i] === 'filled' ||
+                    e[i] === 'open') {
 
                     rslt.style = e[i];
 
-                } else if (e[i] === "circle" ||
-                    e[i] === "dot" ||
-                    e[i] === "sesame") {
+                } else if (e[i] === 'circle' ||
+                    e[i] === 'dot' ||
+                    e[i] === 'sesame') {
 
                     rslt.symbol = e[i];
 
-                } else if (e[i] === "current") {
+                } else if (e[i] === 'current') {
 
                     rslt.color = e[i];
 
-                } else if (e[i] === "outside" || e[i] === "before" || e[i] === "after") {
+                } else if (e[i] === 'outside' || e[i] === 'before' || e[i] === 'after') {
 
                     rslt.position = e[i];
 
@@ -874,26 +867,26 @@ export const all = [
 
             if (rslt.style == null && rslt.symbol == null) {
 
-                rslt.style = "auto";
+                rslt.style = 'auto';
 
             } else {
 
-                rslt.symbol = rslt.symbol || "circle";
-                rslt.style = rslt.style || "filled";
+                rslt.symbol = rslt.symbol || 'circle';
+                rslt.style = rslt.style || 'filled';
 
             }
 
-            rslt.position = rslt.position || "outside";
-            rslt.color = rslt.color || "current";
+            rslt.position = rslt.position || 'outside';
+            rslt.color = rslt.color || 'current';
 
             return rslt;
         },
-        null
+        null,
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "textOutline",
-        "none",
+        'textOutline',
+        'none',
         ['span'],
         true,
         true,
@@ -901,20 +894,20 @@ export const all = [
 
             /*
              * returns {c: <color>?, thichness: <length>} | "none"
-             * 
+             *
              */
 
-            if (str === "none") {
+            if (str === 'none') {
 
                 return str;
 
             } else {
 
-                var r = {};
-                var s = str.split(" ");
+                const r = {};
+                const s = str.split(' ');
                 if (s.length === 0 || s.length > 2)
                     return null;
-                var c = parseColor(s[0]);
+                const c = parseColor(s[0]);
 
                 r.color = c;
 
@@ -924,7 +917,7 @@ export const all = [
                 if (s.length !== 1)
                     return null;
 
-                var l = parseLength(s[0]);
+                const l = parseLength(s[0]);
 
                 if (!l)
                     return null;
@@ -935,17 +928,17 @@ export const all = [
             }
 
         },
-        function (doc, parent, element, attr, context) {
+        function (doc, parent, element, attr) {
 
             /*
              * returns {color: <color>, thickness: <norm length>}
-             * 
+             *
              */
 
-            if (attr === "none")
+            if (attr === 'none')
                 return attr;
 
-            var rslt = {};
+            const rslt = {};
 
             if (attr.color === null) {
 
@@ -963,19 +956,19 @@ export const all = [
                 element.styleAttrs[byName.fontSize.qname],
                 element.styleAttrs[byName.fontSize.qname],
                 doc.cellLength.h,
-                doc.pxLength.h
+                doc.pxLength.h,
             );
 
             if (rslt.thickness === null)
                 return null;
 
             return rslt;
-        }
+        },
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "textShadow",
-        "none",
+        'textShadow',
+        'none',
         ['span'],
         true,
         true,
@@ -984,17 +977,17 @@ export const all = [
 
             /*
              * returns [{x_off: <length>, y_off: <length>, b_radius: <length>, color: <color>}*] or "none"
-             * 
+             *
              */
 
-            if (attr === "none")
+            if (attr === 'none')
                 return attr;
 
-            var r = [];
+            const r = [];
 
-            for (var i = 0; i < attr.length; i++) {
+            for (let i = 0; i < attr.length; i++) {
 
-                var shadow = {};
+                const shadow = {};
 
                 shadow.x_off = toComputedLength(
                     attr[i][0].value,
@@ -1002,7 +995,7 @@ export const all = [
                     null,
                     element.styleAttrs[byName.fontSize.qname],
                     null,
-                    doc.pxLength.w
+                    doc.pxLength.w,
                 );
 
                 if (shadow.x_off === null)
@@ -1014,7 +1007,7 @@ export const all = [
                     null,
                     element.styleAttrs[byName.fontSize.qname],
                     null,
-                    doc.pxLength.h
+                    doc.pxLength.h,
                 );
 
                 if (shadow.y_off === null)
@@ -1032,7 +1025,7 @@ export const all = [
                         null,
                         element.styleAttrs[byName.fontSize.qname],
                         null,
-                        doc.pxLength.h
+                        doc.pxLength.h,
                     );
 
                     if (shadow.b_radius === null)
@@ -1055,66 +1048,66 @@ export const all = [
             }
 
             return r;
-        }
+        },
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "unicodeBidi",
-        "normal",
+        'unicodeBidi',
+        'normal',
         ['span', 'p'],
         false,
         true,
         function (str) {
             return str;
         },
-        null
+        null,
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "visibility",
-        "visible",
+        'visibility',
+        'visible',
         ['body', 'div', 'p', 'region', 'span'],
         true,
         true,
         function (str) {
             return str;
         },
-        null
+        null,
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "wrapOption",
-        "wrap",
+        'wrapOption',
+        'wrap',
         ['span'],
         true,
         true,
         function (str) {
             return str;
         },
-        null
+        null,
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "writingMode",
-        "lrtb",
+        'writingMode',
+        'lrtb',
         ['region'],
         false,
         true,
         function (str) {
             return str;
         },
-        null
+        null,
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        "zIndex",
-        "auto",
+        'zIndex',
+        'auto',
         ['region'],
         false,
         true,
         function (str) {
 
-            var rslt;
+            let rslt;
 
             if (str === 'auto') {
 
@@ -1132,37 +1125,37 @@ export const all = [
 
             return rslt;
         },
-        null
+        null,
     ),
     new StylingAttributeDefinition(
         ns_ebutts,
-        "linePadding",
-        "0c",
+        'linePadding',
+        '0c',
         ['p'],
         true,
         false,
         parseLength,
-        function (doc, parent, element, attr, context) {
+        function (doc, parent, element, attr) {
 
             return toComputedLength(attr.value, attr.unit, null, null, doc.cellLength.w, null);
 
-        }
+        },
     ),
     new StylingAttributeDefinition(
         ns_ebutts,
-        "multiRowAlign",
-        "auto",
+        'multiRowAlign',
+        'auto',
         ['p'],
         true,
         false,
         function (str) {
             return str;
         },
-        null
+        null,
     ),
     new StylingAttributeDefinition(
         ns_smpte,
-        "backgroundImage",
+        'backgroundImage',
         null,
         ['div'],
         false,
@@ -1170,44 +1163,44 @@ export const all = [
         function (str) {
             return str;
         },
-        null
+        null,
     ),
     new StylingAttributeDefinition(
         ns_itts,
-        "forcedDisplay",
-        "false",
+        'forcedDisplay',
+        'false',
         ['body', 'div', 'p', 'region', 'span'],
         true,
         true,
         function (str) {
             return str === 'true' ? true : false;
         },
-        null
+        null,
     ),
     new StylingAttributeDefinition(
         ns_itts,
-        "fillLineGap",
-        "false",
+        'fillLineGap',
+        'false',
         ['p'],
         true,
         true,
         function (str) {
             return str === 'true' ? true : false;
         },
-        null
-    )
+        null,
+    ),
 ];
 
 /* TODO: allow null parse function */
 
 export const byQName = {};
-for (var i in all) {
+for (const i in all) {
 
     byQName[all[i].qname] = all[i];
 }
 
 export const byName = {};
-for (var j in all) {
+for (const j in all) {
 
     byName[all[j].name] = all[j];
 }
diff --git a/src/main/js/utils.js b/src/main/js/utils.js
index cd4cc34c..0c405ff0 100644
--- a/src/main/js/utils.js
+++ b/src/main/js/utils.js
@@ -1,4 +1,4 @@
-/* 
+/*
  * Copyright (c) 2016, Pierre-Anthony Lemieux <pal@sandflow.com>
  * All rights reserved.
  *
@@ -28,7 +28,6 @@
  * @module imscUtils
  */
 
-
 /* Documents the error handler interface */
 
 /**
@@ -46,16 +45,15 @@
  * @class
  */
 
-
 /*
  * Parses a TTML color expression
- * 
+ *
  */
 
-var HEX_COLOR_RE = /#([0-9a-fA-F]{2})([0-9a-fA-F]{2})([0-9a-fA-F]{2})([0-9a-fA-F]{2})?/;
-var DEC_COLOR_RE = /rgb\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)/;
-var DEC_COLORA_RE = /rgba\(\s*(\d+),\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)/;
-var NAMED_COLOR = {
+const HEX_COLOR_RE = /#([0-9a-fA-F]{2})([0-9a-fA-F]{2})([0-9a-fA-F]{2})([0-9a-fA-F]{2})?/;
+const DEC_COLOR_RE = /rgb\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)/;
+const DEC_COLORA_RE = /rgba\(\s*(\d+),\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)/;
+const NAMED_COLOR = {
     transparent: [0, 0, 0, 0],
     black: [0, 0, 0, 255],
     silver: [192, 192, 192, 255],
@@ -74,16 +72,16 @@ var NAMED_COLOR = {
     blue: [0, 0, 255, 255],
     teal: [0, 128, 128, 255],
     aqua: [0, 255, 255, 255],
-    cyan: [0, 255, 255, 255]
+    cyan: [0, 255, 255, 255],
 };
 
 export function parseColor(str) {
 
-    var m;
+    let m;
 
-    var r = null;
+    let r = null;
 
-    var nc = NAMED_COLOR[str.toLowerCase()];
+    const nc = NAMED_COLOR[str.toLowerCase()];
 
     if (nc !== undefined) {
 
@@ -115,13 +113,13 @@ export function parseColor(str) {
     return r;
 };
 
-var LENGTH_RE = /^((?:\+|\-)?\d*(?:\.\d+)?)(px|em|c|%|rh|rw)$/;
+const LENGTH_RE = /^((?:\+|-)?\d*(?:\.\d+)?)(px|em|c|%|rh|rw)$/;
 
 export function parseLength(str) {
 
-    var m;
+    let m;
 
-    var r = null;
+    let r = null;
 
     if ((m = LENGTH_RE.exec(str)) !== null) {
 
@@ -133,25 +131,25 @@ export function parseLength(str) {
 
 export function parseTextShadow(str) {
 
-    var shadows = str.match(/([^\(,\)]|\([^\)]+\))+/g);
+    const shadows = str.match(/([^(,)]|\([^)]+\))+/g);
 
-    var r = [];
+    const r = [];
 
-    for (var i = 0; i < shadows.length; i++) {
+    for (let i = 0; i < shadows.length; i++) {
 
-        var shadow = shadows[i].split(" ");
+        const shadow = shadows[i].split(' ');
 
-        if (shadow.length === 1 && shadow[0] === "none") {
+        if (shadow.length === 1 && shadow[0] === 'none') {
 
-            return "none";
+            return 'none';
 
         } else if (shadow.length > 1 && shadow.length < 5) {
 
-            var out_shadow = [null, null, null, null];
+            const out_shadow = [null, null, null, null];
 
             /* x offset */
 
-            var l = parseLength(shadow.shift());
+            let l = parseLength(shadow.shift());
 
             if (l === null)
                 return null;
@@ -189,7 +187,7 @@ export function parseTextShadow(str) {
                 continue;
             }
 
-            var c = parseColor(shadow[0]);
+            const c = parseColor(shadow[0]);
 
             if (c === null)
                 return null;
@@ -204,20 +202,19 @@ export function parseTextShadow(str) {
     return r;
 };
 
-
 export function parsePosition(str) {
 
     /* see https://www.w3.org/TR/ttml2/#style-value-position */
 
-    var s = str.split(" ");
+    const s = str.split(' ');
 
-    var isKeyword = function (str) {
+    const isKeyword = function (str) {
 
-        return str === "center" ||
-            str === "left" ||
-            str === "top" ||
-            str === "bottom" ||
-            str === "right";
+        return str === 'center' ||
+            str === 'left' ||
+            str === 'top' ||
+            str === 'bottom' ||
+            str === 'right';
 
     };
 
@@ -229,11 +226,11 @@ export function parsePosition(str) {
 
     /* initial clean-up pass */
 
-    for (var j = 0; j < s.length; j++) {
+    for (let j = 0; j < s.length; j++) {
 
         if (!isKeyword(s[j])) {
 
-            var l = parseLength(s[j]);
+            const l = parseLength(s[j]);
 
             if (l === null)
                 return null;
@@ -245,24 +242,24 @@ export function parsePosition(str) {
 
     /* position default */
 
-    var pos = {
-        h: { edge: "left", offset: { value: 50, unit: "%" } },
-        v: { edge: "top", offset: { value: 50, unit: "%" } }
+    const pos = {
+        h: { edge: 'left', offset: { value: 50, unit: '%' } },
+        v: { edge: 'top', offset: { value: 50, unit: '%' } },
     };
 
     /* update position */
 
-    for (var i = 0; i < s.length;) {
+    for (let i = 0; i < s.length;) {
 
         /* extract the current component */
 
-        var comp = s[i++];
+        const comp = s[i++];
 
         if (isKeyword(comp)) {
 
             /* we have a keyword */
 
-            var offset = { value: 0, unit: "%" };
+            let offset = { value: 0, unit: '%' };
 
             /* peek at the next component */
 
@@ -276,30 +273,26 @@ export function parsePosition(str) {
 
             /* skip if center */
 
-            if (comp === "right") {
+            if (comp === 'right') {
 
                 pos.h.edge = comp;
 
                 pos.h.offset = offset;
 
-            } else if (comp === "bottom") {
+            } else if (comp === 'bottom') {
 
                 pos.v.edge = comp;
 
-
                 pos.v.offset = offset;
 
-
-            } else if (comp === "left") {
+            } else if (comp === 'left') {
 
                 pos.h.offset = offset;
 
-
-            } else if (comp === "top") {
+            } else if (comp === 'top') {
 
                 pos.v.offset = offset;
 
-
             }
 
         } else if (s.length === 1 || s.length === 2) {
@@ -333,7 +326,6 @@ export function parsePosition(str) {
     return pos;
 };
 
-
 export class ComputedLength {
     constructor(rw, rh) {
         this.rw = rw;
@@ -352,7 +344,7 @@ export class ComputedLength {
 
 /**
  * Computes a specified length to a root container relative length
- * 
+ *
  * @param {number} lengthVal Length value to be computed
  * @param {string} lengthUnit Units of the length value
  * @param {number} emScale length of 1em, or null if em is not allowed
@@ -364,46 +356,46 @@ export class ComputedLength {
  */
 export function toComputedLength(lengthVal, lengthUnit, emLength, percentLength, cellLength, pxLength) {
 
-    if (lengthUnit === "%" && percentLength) {
+    if (lengthUnit === '%' && percentLength) {
 
         return new ComputedLength(
             percentLength.rw * lengthVal / 100,
-            percentLength.rh * lengthVal / 100
+            percentLength.rh * lengthVal / 100,
         );
 
-    } else if (lengthUnit === "em" && emLength) {
+    } else if (lengthUnit === 'em' && emLength) {
 
         return new ComputedLength(
             emLength.rw * lengthVal,
-            emLength.rh * lengthVal
+            emLength.rh * lengthVal,
         );
 
-    } else if (lengthUnit === "c" && cellLength) {
+    } else if (lengthUnit === 'c' && cellLength) {
 
         return new ComputedLength(
             lengthVal * cellLength.rw,
-            lengthVal * cellLength.rh
+            lengthVal * cellLength.rh,
         );
 
-    } else if (lengthUnit === "px" && pxLength) {
+    } else if (lengthUnit === 'px' && pxLength) {
 
         return new ComputedLength(
             lengthVal * pxLength.rw,
-            lengthVal * pxLength.rh
+            lengthVal * pxLength.rh,
         );
 
-    } else if (lengthUnit === "rh") {
+    } else if (lengthUnit === 'rh') {
 
         return new ComputedLength(
             0,
-            lengthVal / 100
+            lengthVal / 100,
         );
 
-    } else if (lengthUnit === "rw") {
+    } else if (lengthUnit === 'rw') {
 
         return new ComputedLength(
             lengthVal / 100,
-            0
+            0,
         );
 
     } else {
@@ -412,4 +404,8 @@ export function toComputedLength(lengthVal, lengthUnit, emLength, percentLength,
 
     }
 
-};
+}
+
+export function hasOwnProperty(obj, prop) {
+    return Object.prototype.hasOwnProperty.call(obj, prop);
+}
diff --git a/src/test/js/ParseColor.js b/src/test/js/ParseColor.js
index 87eabed2..4cb6657a 100644
--- a/src/test/js/ParseColor.js
+++ b/src/test/js/ParseColor.js
@@ -1,47 +1,46 @@
-if (typeof imscUtils === 'undefined')
-    imscUtils = require("../../main/js/utils.js");
+import { parseColor } from '../../main/js/utils.js';
 
-QUnit.test("ParseColor",
+QUnit.test('ParseColor',
     function (assert) {
 
-        var tests = [
-            ["#FFFFFF", [255, 255, 255, 255]],
-            ["#FFFFFF7F", [255, 255, 255, 127]],
-            ["rgb(255,128,255)", [255, 128, 255, 255]],
-            ["rgb( 255, 128 ,   255   )", [255, 128, 255, 255]],
-            ["rgba(128,255,255,63)", [128, 255, 255, 63]],
-            ["transparent", [0, 0, 0, 0]],
-            ["black", [0, 0, 0, 255]],
-            ["silver", [0xc0, 0xc0, 0xc0, 255]],
-            ["gray", [0x80, 0x80, 0x80, 255]],
-            ["white", [255, 255, 255, 255]],
-            ["maroon", [0x80, 0, 0, 255]],
-            ["red", [255, 0, 0, 255]],
-            ["purple", [0x80, 0, 0x80, 255]],
-            ["fuchsia", [255, 0, 255, 255]],
-            ["magenta", [255, 0, 255, 255]],
-            ["green", [0, 0x80, 0, 255]],
-            ["lime", [0, 255, 0, 255]],
-            ["olive", [0x80, 0x80, 0, 255]],
-            ["yellow", [255, 255, 0, 255]],
-            ["navy", [0, 0, 0x80, 255]],
-            ["blue", [0, 0, 255, 255]],
-            ["teal", [0, 0x80, 0x80, 255]],
-            ["aqua", [0, 255, 255, 255]],
-            ["cyan", [0, 255, 255, 255]],
-            ["Cyan", [0, 255, 255, 255]],
-            ["CYAN", [0, 255, 255, 255]],
-            ["#FFffFF", [255, 255, 255, 255]],
-            ["#FfFFFF7f", [255, 255, 255, 127]],
-            ["#red", null],
+        const tests = [
+            ['#FFFFFF', [255, 255, 255, 255]],
+            ['#FFFFFF7F', [255, 255, 255, 127]],
+            ['rgb(255,128,255)', [255, 128, 255, 255]],
+            ['rgb( 255, 128 ,   255   )', [255, 128, 255, 255]],
+            ['rgba(128,255,255,63)', [128, 255, 255, 63]],
+            ['transparent', [0, 0, 0, 0]],
+            ['black', [0, 0, 0, 255]],
+            ['silver', [0xc0, 0xc0, 0xc0, 255]],
+            ['gray', [0x80, 0x80, 0x80, 255]],
+            ['white', [255, 255, 255, 255]],
+            ['maroon', [0x80, 0, 0, 255]],
+            ['red', [255, 0, 0, 255]],
+            ['purple', [0x80, 0, 0x80, 255]],
+            ['fuchsia', [255, 0, 255, 255]],
+            ['magenta', [255, 0, 255, 255]],
+            ['green', [0, 0x80, 0, 255]],
+            ['lime', [0, 255, 0, 255]],
+            ['olive', [0x80, 0x80, 0, 255]],
+            ['yellow', [255, 255, 0, 255]],
+            ['navy', [0, 0, 0x80, 255]],
+            ['blue', [0, 0, 255, 255]],
+            ['teal', [0, 0x80, 0x80, 255]],
+            ['aqua', [0, 255, 255, 255]],
+            ['cyan', [0, 255, 255, 255]],
+            ['Cyan', [0, 255, 255, 255]],
+            ['CYAN', [0, 255, 255, 255]],
+            ['#FFffFF', [255, 255, 255, 255]],
+            ['#FfFFFF7f', [255, 255, 255, 127]],
+            ['#red', null],
         ];
 
-        for (var i in tests) {
+        for (const i in tests) {
             assert.deepEqual(
-                imscUtils.parseColor(tests[i][0]),
+                parseColor(tests[i][0]),
                 tests[i][1],
-                tests[i][0]
-                );
+                tests[i][0],
+            );
         }
-    }
-);
\ No newline at end of file
+    },
+);
diff --git a/src/test/js/ParsePositionTest.js b/src/test/js/ParsePositionTest.js
index bd8d143f..7e0a5de5 100644
--- a/src/test/js/ParsePositionTest.js
+++ b/src/test/js/ParsePositionTest.js
@@ -1,13 +1,12 @@
-if (typeof imscUtils === 'undefined')
-    imscUtils = require("../../main/js/utils.js");
+import { parsePosition } from '../../../main/js/utils.js';
 
-QUnit.test("ParsePosition",
+QUnit.test('ParsePosition',
     function (assert) {
 
         function position(h_edge, h_offval, h_offunit, v_edge, v_offval, v_offunit) {
             return {
-                h: {edge: h_edge, offset: {value: h_offval, unit: h_offunit}},
-                v: {edge: v_edge, offset: {value: v_offval, unit: v_offunit}}
+                h: { edge: h_edge, offset: { value: h_offval, unit: h_offunit } },
+                v: { edge: v_edge, offset: { value: v_offval, unit: v_offunit } },
             };
         }
 
@@ -15,87 +14,87 @@ QUnit.test("ParsePosition",
 
             /* one component */
 
-            ["center", position("left", 50, "%", "top", 50, "%")],
-            ["left", position("left", 0, "%", "top", 50, "%")],
-            ["right", position("right", 0, "%", "top", 50, "%")],
-            ["top", position("left", 50, "%", "top", 0, "%")],
-            ["bottom", position("left", 50, "%", "bottom", 0, "%")],
-            ["25%", position("left", 25, "%", "top", 50, "%")],
+            ['center', position('left', 50, '%', 'top', 50, '%')],
+            ['left', position('left', 0, '%', 'top', 50, '%')],
+            ['right', position('right', 0, '%', 'top', 50, '%')],
+            ['top', position('left', 50, '%', 'top', 0, '%')],
+            ['bottom', position('left', 50, '%', 'bottom', 0, '%')],
+            ['25%', position('left', 25, '%', 'top', 50, '%')],
 
             /* two components */
 
-            ["bottom center", position("left", 50, "%", "bottom", 0, "%")],
-            ["bottom left", position("left", 0, "%", "bottom", 0, "%")],
-            ["bottom right", position("right", 0, "%", "bottom", 0, "%")],
+            ['bottom center', position('left', 50, '%', 'bottom', 0, '%')],
+            ['bottom left', position('left', 0, '%', 'bottom', 0, '%')],
+            ['bottom right', position('right', 0, '%', 'bottom', 0, '%')],
             /*["bottom 25%", position("left", 0, "%", "top", 50, "%")],*/
-            ["center center", position("left", 50, "%", "top", 50, "%")],
-            ["center top", position("left", 50, "%", "top", 0, "%")],
-            ["center bottom", position("left", 50, "%", "bottom", 0, "%")],
-            ["center left", position("left", 0, "%", "top", 50, "%")],
-            ["center right", position("right", 0, "%", "top", 50, "%")],
-            ["center 33%", position("left", 50, "%", "top", 33, "%")],
-            ["left center", position("left", 0, "%", "top", 50, "%")],
-            ["left top", position("left", 0, "%", "top", 0, "%")],
-            ["left bottom", position("left", 0, "%", "bottom", 0, "%")],
-            ["left 45%", position("left", 0, "%", "top", 45, "%")],
-            ["right center", position("right", 0, "%", "top", 50, "%")],
-            ["right top", position("right", 0, "%", "top", 0, "%")],
-            ["right bottom", position("right", 0, "%", "bottom", 0, "%")],
-            ["right 20%", position("right", 0, "%", "top", 20, "%")],
-            ["top center", position("left", 50, "%", "top", 0, "%")],
-            ["top left", position("left", 0, "%", "top", 0, "%")],
-            ["top right", position("right", 0, "%", "top", 0, "%")],
+            ['center center', position('left', 50, '%', 'top', 50, '%')],
+            ['center top', position('left', 50, '%', 'top', 0, '%')],
+            ['center bottom', position('left', 50, '%', 'bottom', 0, '%')],
+            ['center left', position('left', 0, '%', 'top', 50, '%')],
+            ['center right', position('right', 0, '%', 'top', 50, '%')],
+            ['center 33%', position('left', 50, '%', 'top', 33, '%')],
+            ['left center', position('left', 0, '%', 'top', 50, '%')],
+            ['left top', position('left', 0, '%', 'top', 0, '%')],
+            ['left bottom', position('left', 0, '%', 'bottom', 0, '%')],
+            ['left 45%', position('left', 0, '%', 'top', 45, '%')],
+            ['right center', position('right', 0, '%', 'top', 50, '%')],
+            ['right top', position('right', 0, '%', 'top', 0, '%')],
+            ['right bottom', position('right', 0, '%', 'bottom', 0, '%')],
+            ['right 20%', position('right', 0, '%', 'top', 20, '%')],
+            ['top center', position('left', 50, '%', 'top', 0, '%')],
+            ['top left', position('left', 0, '%', 'top', 0, '%')],
+            ['top right', position('right', 0, '%', 'top', 0, '%')],
             /*["top 75%", position("left", 75, "%", "top", 50, "%")],*/
-            ["75% center", position("left", 75, "%", "top", 50, "%")],
-            ["75% top", position("left", 75, "%", "top", 0, "%")],
-            ["75% bottom", position("left", 75, "%", "bottom", 0, "%")],
-            ["75% 75%", position("left", 75, "%", "top", 75, "%")],
+            ['75% center', position('left', 75, '%', 'top', 50, '%')],
+            ['75% top', position('left', 75, '%', 'top', 0, '%')],
+            ['75% bottom', position('left', 75, '%', 'bottom', 0, '%')],
+            ['75% 75%', position('left', 75, '%', 'top', 75, '%')],
 
             /* three components */
 
-            ["bottom left 1%", position("left", 1, "%", "bottom", 0, "%")],
-            ["bottom right 2%", position("right", 2, "%", "bottom", 0, "%")],
-            ["bottom 3% center", position("left", 50, "%", "bottom", 3, "%")],
-            ["bottom 4% left", position("left", 0, "%", "bottom", 4, "%")],
-            ["bottom 5% right", position("right", 0, "%", "bottom", 5, "%")],
-            ["center bottom 6%", position("left", 50, "%", "bottom", 6, "%")],
-            ["center left 7%", position("left", 7, "%", "top", 50, "%")],
-            ["center right 8%", position("right", 8, "%", "top", 50, "%")],
-            ["center top 9%", position("left", 50, "%", "top", 9, "%")],
-            ["left bottom 10%", position("left", 0, "%", "bottom", 10, "%")],
-            ["left top 11%", position("left", 0, "%", "top", 11, "%")],
-            ["left 12% bottom", position("left", 12, "%", "bottom", 0, "%")],
-            ["left 13% center", position("left", 13, "%", "top", 50, "%")],
-            ["left 14% top", position("left", 14, "%", "top", 0, "%")],
-            ["right bottom 15%", position("right", 0, "%", "bottom", 15, "%")],
-            ["right top 16%", position("right", 0, "%", "top", 16, "%")],
-            ["right 17% bottom", position("right", 17, "%", "bottom", 0, "%")],
-            ["right 18% center", position("right", 18, "%", "top", 50, "%")],
-            ["right 19% top", position("right", 19, "%", "top", 0, "%")],
-            ["top left 20%", position("left", 20, "%", "top", 0, "%")],
-            ["top right 21%", position("right", 21, "%", "top", 0, "%")],
-            ["top 22% center", position("left", 50, "%", "top", 22, "%")],
-            ["top 23% left", position("left", 0, "%", "top", 23, "%")],
-            ["top 24% right", position("right", 0, "%", "top", 24, "%")],
-            
-             /* four components */
+            ['bottom left 1%', position('left', 1, '%', 'bottom', 0, '%')],
+            ['bottom right 2%', position('right', 2, '%', 'bottom', 0, '%')],
+            ['bottom 3% center', position('left', 50, '%', 'bottom', 3, '%')],
+            ['bottom 4% left', position('left', 0, '%', 'bottom', 4, '%')],
+            ['bottom 5% right', position('right', 0, '%', 'bottom', 5, '%')],
+            ['center bottom 6%', position('left', 50, '%', 'bottom', 6, '%')],
+            ['center left 7%', position('left', 7, '%', 'top', 50, '%')],
+            ['center right 8%', position('right', 8, '%', 'top', 50, '%')],
+            ['center top 9%', position('left', 50, '%', 'top', 9, '%')],
+            ['left bottom 10%', position('left', 0, '%', 'bottom', 10, '%')],
+            ['left top 11%', position('left', 0, '%', 'top', 11, '%')],
+            ['left 12% bottom', position('left', 12, '%', 'bottom', 0, '%')],
+            ['left 13% center', position('left', 13, '%', 'top', 50, '%')],
+            ['left 14% top', position('left', 14, '%', 'top', 0, '%')],
+            ['right bottom 15%', position('right', 0, '%', 'bottom', 15, '%')],
+            ['right top 16%', position('right', 0, '%', 'top', 16, '%')],
+            ['right 17% bottom', position('right', 17, '%', 'bottom', 0, '%')],
+            ['right 18% center', position('right', 18, '%', 'top', 50, '%')],
+            ['right 19% top', position('right', 19, '%', 'top', 0, '%')],
+            ['top left 20%', position('left', 20, '%', 'top', 0, '%')],
+            ['top right 21%', position('right', 21, '%', 'top', 0, '%')],
+            ['top 22% center', position('left', 50, '%', 'top', 22, '%')],
+            ['top 23% left', position('left', 0, '%', 'top', 23, '%')],
+            ['top 24% right', position('right', 0, '%', 'top', 24, '%')],
 
-            ["bottom 25% left 75%", position("left", 75, "%", "bottom", 25, "%")],
-            ["bottom 25% right 75%", position("right", 75, "%", "bottom", 25, "%")],
-            ["left 25% bottom 75%", position("left", 25, "%", "bottom", 75, "%")],
-            ["right 25% bottom 75%", position("right", 25, "%", "bottom", 75, "%")],
-            ["top 25% left 75%", position("left", 75, "%", "top", 25, "%")],
-            ["top 25% right 75%", position("right", 75, "%", "top", 25, "%")],
-            ["left 25% top 75%", position("left", 25, "%", "top", 75, "%")],
-            ["right 25% top 75%", position("right", 25, "%", "top", 75, "%")]
+            /* four components */
+
+            ['bottom 25% left 75%', position('left', 75, '%', 'bottom', 25, '%')],
+            ['bottom 25% right 75%', position('right', 75, '%', 'bottom', 25, '%')],
+            ['left 25% bottom 75%', position('left', 25, '%', 'bottom', 75, '%')],
+            ['right 25% bottom 75%', position('right', 25, '%', 'bottom', 75, '%')],
+            ['top 25% left 75%', position('left', 75, '%', 'top', 25, '%')],
+            ['top 25% right 75%', position('right', 75, '%', 'top', 25, '%')],
+            ['left 25% top 75%', position('left', 25, '%', 'top', 75, '%')],
+            ['right 25% top 75%', position('right', 25, '%', 'top', 75, '%')],
         ];
 
-        for (var i in tests) {
+        for (const i in tests) {
             assert.deepEqual(
-                imscUtils.parsePosition(tests[i][0]),
+                parsePosition(tests[i][0]),
                 tests[i][1],
-                tests[i][0]
-                );
+                tests[i][0],
+            );
         }
-    }
-);
\ No newline at end of file
+    },
+);
diff --git a/src/test/js/ParseTextShadowTest.js b/src/test/js/ParseTextShadowTest.js
index e4a0bfbd..7de625ed 100644
--- a/src/test/js/ParseTextShadowTest.js
+++ b/src/test/js/ParseTextShadowTest.js
@@ -1,35 +1,32 @@
-if (typeof imscUtils === 'undefined')
-    imscUtils = require("../../main/js/utils.js");
+import { parseTextShadow } from '../../main/js/utils.js';
 
-QUnit.test("ParseTextShadow",
+QUnit.test('ParseTextShadow',
     function (assert) {
 
         function shadow(ioff_val, ioff_unit, boff_val, boff_unit, blur_val, blur_unit, color) {
             return [
-                {value: ioff_val, unit: ioff_unit},
-                {value: boff_val, unit: boff_unit},
-                {value: blur_val, unit: blur_unit},
-                color
+                { value: ioff_val, unit: ioff_unit },
+                { value: boff_val, unit: boff_unit },
+                { value: blur_val, unit: blur_unit },
+                color,
             ]
         }
 
-
         tests = [
 
             /* four components */
 
-            ["10% -20% 5% lime", [shadow(10, "%", -20, "%", 5, "%", [0, 255, 0, 255])]],
-            ["+10% 0% -1% rgba(233,30,99,255)", [shadow(10, "%", 0, "%", -1, "%", [233, 30, 99, 255])]]
+            ['10% -20% 5% lime', [shadow(10, '%', -20, '%', 5, '%', [0, 255, 0, 255])]],
+            ['+10% 0% -1% rgba(233,30,99,255)', [shadow(10, '%', 0, '%', -1, '%', [233, 30, 99, 255])]],
 
-         
         ];
 
-        for (var i in tests) {
+        for (const i in tests) {
             assert.deepEqual(
-                imscUtils.parseTextShadow(tests[i][0]),
+                parseTextShadow(tests[i][0]),
                 tests[i][1],
-                tests[i][0]
-                );
+                tests[i][0],
+            );
         }
-    }
-);
\ No newline at end of file
+    },
+);

From a656c552f5071425635eaf5d73946edbb6017666 Mon Sep 17 00:00:00 2001
From: Casey Occhialini <1508707+littlespex@users.noreply.github.com>
Date: Fri, 26 Apr 2024 23:48:56 -0700
Subject: [PATCH 03/21] fix: use proper ES6 inheritence

---
 src/main/js/doc.js | 57 +++++++++++++++++++++++-----------------------
 1 file changed, 29 insertions(+), 28 deletions(-)

diff --git a/src/main/js/doc.js b/src/main/js/doc.js
index df585195..b9abb237 100644
--- a/src/main/js/doc.js
+++ b/src/main/js/doc.js
@@ -622,7 +622,7 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
 
         /* create default region */
 
-        const dr = Region.createDefaultRegion(doc.lang);
+        const dr = Region.prototype.createDefaultRegion(doc.lang);
 
         regions[dr.id] = dr;
 
@@ -1024,13 +1024,19 @@ class Layout {
     }
 }
 
+class ContentElement {
+    constructor(kind) {
+        this.kind = kind;
+    }
+}
+
 /*
  * Represents a TTML image element
  */
 
-class Image {
+class Image extends ContentElement {
     constructor(src, type) {
-        ContentElement.call(this, 'image');
+        super('image');
         this.src = src;
         this.type = type;
     }
@@ -1062,12 +1068,6 @@ class Image {
  *
  */
 
-class ContentElement {
-    constructor(kind) {
-        this.kind = kind;
-    }
-}
-
 class IdentifiedElement {
     constructor(id) {
         this.id = id;
@@ -1145,9 +1145,9 @@ class TimedElement {
  * Represents a TTML body element
  */
 
-class Body {
+class Body extends ContentElement {
     constructor() {
-        ContentElement.call(this, 'body');
+        super('body');
     }
 
     initFromNode(doc, node, xmllang, errorHandler) {
@@ -1165,9 +1165,9 @@ class Body {
  * Represents a TTML div element
  */
 
-class Div {
+class Div extends ContentElement {
     constructor() {
-        ContentElement.call(this, 'div');
+        super('div');
     }
 
     initFromNode(doc, parent, node, xmllang, errorHandler) {
@@ -1185,9 +1185,9 @@ class Div {
  * Represents a TTML p element
  */
 
-class P {
+class P extends ContentElement {
     constructor() {
-        ContentElement.call(this, 'p');
+        super('p');
     }
 
     initFromNode(doc, parent, node, xmllang, errorHandler) {
@@ -1205,9 +1205,9 @@ class P {
  * Represents a TTML span element
  */
 
-class Span {
+class Span extends ContentElement {
     constructor() {
-        ContentElement.call(this, 'span');
+        super('span');
     }
 
     initFromNode(doc, parent, node, xmllang, xmlspace, errorHandler) {
@@ -1226,9 +1226,9 @@ class Span {
  * Represents a TTML anonymous span element
  */
 
-class AnonymousSpan {
+class AnonymousSpan extends ContentElement {
     constructor() {
-        ContentElement.call(this, 'span');
+        super('span');
     }
 
     initFromText(doc, parent, text, xmllang, xmlspace, errorHandler) {
@@ -1244,9 +1244,9 @@ class AnonymousSpan {
  * Represents a TTML br element
  */
 
-class Br {
+class Br extends ContentElement {
     constructor() {
-        ContentElement.call(this, 'br');
+        super('br');
     }
 
     initFromNode(doc, parent, node, xmllang, errorHandler) {
@@ -1263,16 +1263,17 @@ class Br {
  */
 
 class Region {
-    constructor() {
-    }
+    constructor() { }
 
-    static createDefaultRegion(xmllang) {
+    createDefaultRegion(xmllang) {
         const r = new Region();
 
-        IdentifiedElement.call(r, '');
-        StyledElement.call(r, {});
-        AnimatedElement.call(r, []);
-        TimedElement.call(r, 0, Number.POSITIVE_INFINITY, null);
+        r.id = '';
+        r.styleAttrs = {};
+        r.sets = [];
+        r.explicit_begin = 0;
+        r.explicit_end = Number.POSITIVE_INFINITY;
+        r.explicit_dur = null;
 
         this.lang = xmllang;
 

From f1b14923c4e3a3dd53249b99d384c0b6f2b52771 Mon Sep 17 00:00:00 2001
From: Casey Occhialini <1508707+littlespex@users.noreply.github.com>
Date: Fri, 26 Apr 2024 23:50:39 -0700
Subject: [PATCH 04/21] fix: update build tools - replace jshint with eslint -
 replace closure compiler with rollup + terser - replace browserify with
 rollup + tsc

---
 Gruntfile.js => Gruntfile.cjs |   79 +-
 eslint.config.js              |   31 +
 package-lock.json             | 5373 +++++++++++++++++++++++++++++++++
 package.json                  |   24 +-
 rollup.config.js              |   67 +
 tsconfig.json                 |   48 +
 6 files changed, 5561 insertions(+), 61 deletions(-)
 rename Gruntfile.js => Gruntfile.cjs (56%)
 create mode 100644 eslint.config.js
 create mode 100644 package-lock.json
 create mode 100644 rollup.config.js
 create mode 100644 tsconfig.json

diff --git a/Gruntfile.js b/Gruntfile.cjs
similarity index 56%
rename from Gruntfile.js
rename to Gruntfile.cjs
index 918b3c85..0333d746 100644
--- a/Gruntfile.js
+++ b/Gruntfile.cjs
@@ -20,19 +20,19 @@ module.exports = function (grunt) {
                         { expand: true, cwd: '<%= properties.unitTestsResourcesDir %>', src: 'imsc-tests/imsc1/tests.json', dest: '<%= properties.webappBuildDir %>' },
                         { expand: true, cwd: '<%= properties.unitTestsResourcesDir %>', src: 'imsc-tests/imsc1_1/ttml/**', dest: '<%= properties.webappBuildDir %>' },
                         { expand: true, cwd: '<%= properties.unitTestsResourcesDir %>', src: 'imsc-tests/imsc1_1/tests.json', dest: '<%= properties.webappBuildDir %>' },
-                        { expand: true, cwd: '<%= properties.unitTestsResourcesDir %>', src: 'unit-tests/**', dest: '<%= properties.webappBuildDir %>' }
-                    ]
+                        { expand: true, cwd: '<%= properties.unitTestsResourcesDir %>', src: 'unit-tests/**', dest: '<%= properties.webappBuildDir %>' },
+                    ],
             },
 
             release: {
                 src: '<%= properties.umdBuildDir %>/<%= properties.umdMinName %>',
-                dest: '<%= properties.webappBuildDir %>/libs/imsc.js'
+                dest: '<%= properties.webappBuildDir %>/libs/imsc.js',
             },
 
             debug: {
                 src: '<%= properties.umdBuildDir %>/<%= properties.umdDebugName %>',
-                dest: '<%= properties.webappBuildDir %>/libs/imsc.js'
-            }
+                dest: '<%= properties.webappBuildDir %>/libs/imsc.js',
+            },
         },
 
         npmcopy: {
@@ -43,53 +43,26 @@ module.exports = function (grunt) {
                         'qunit-assert-close:main',
                         'qunitjs:main',
                         'filesaver.js-npm:main',
-                        'jszip/dist/jszip.js'
-                    ]
-                }
-            }
-        },
-
-        browserify: [
-            {
-                src: "<%= pkg.main %>",
-                dest: "<%= properties.umdBuildDir %>/<%= properties.umdDebugName %>",
-                options: {
-                    exclude: ["sax"],
-                    browserifyOptions: {
-                        standalone: 'imsc'
-                    }
-                }
+                        'jszip/dist/jszip.js',
+                    ],
+                },
             },
-            {
-                src: "<%= pkg.main %>",
-                dest: "<%= properties.umdBuildDir %>/<%= properties.umdAllDebugName %>",
-                options: {
-                    browserifyOptions: {
-                        standalone: 'imsc'
-                    }
-                }
-            }
-        ],
-
-        jshint: {
-            'default': {
-                src: "src/main/js",
-                options: {
-                    "-W032": true
-                }
-            }
         },
 
         exec: {
-            minify:
-            {
-                cmd: [
-                    "npx google-closure-compiler --js=<%= properties.umdBuildDir %>/<%= properties.umdAllDebugName %> --js_output_file=<%= properties.umdBuildDir %>/<%= properties.umdAllMinName %>",
-                    "npx google-closure-compiler --js=<%= properties.umdBuildDir %>/<%= properties.umdDebugName %> --js_output_file=<%= properties.umdBuildDir %>/<%= properties.umdMinName %>"
-                ].join("&&")
-            }
-        }
-    }
+            compile: {
+                cmd: 'tsc',
+            },
+
+            lint: {
+                cmd: 'eslint src',
+            },
+
+            bundle: {
+                cmd: 'rollup -c rollup.config.js',
+            },
+        },
+    },
 
     );
 
@@ -97,17 +70,15 @@ module.exports = function (grunt) {
 
     grunt.loadNpmTasks('grunt-npmcopy');
 
-    grunt.loadNpmTasks('grunt-browserify');
-
-    grunt.loadNpmTasks('grunt-contrib-jshint');
-
     grunt.loadNpmTasks('grunt-sync');
 
     grunt.loadNpmTasks('grunt-exec');
 
-    grunt.registerTask('build:release', ['jshint', 'browserify', 'exec:minify', 'sync:all', 'sync:release', 'npmcopy']);
+    grunt.registerTask('lint', ['exec:lint']);
+
+    grunt.registerTask('build:release', ['lint', 'exec:compile', 'exec:bundle', 'sync:all', 'sync:release', 'npmcopy']);
 
-    grunt.registerTask('build:debug', ['jshint', 'browserify', 'exec:minify', 'sync:all', 'sync:debug', 'npmcopy']);
+    grunt.registerTask('build:debug', ['lint', 'exec:compile', 'exec:bundle', 'sync:all', 'sync:debug', 'npmcopy']);
 
     grunt.registerTask('build', ['build:debug']);
 
diff --git a/eslint.config.js b/eslint.config.js
new file mode 100644
index 00000000..60ea9fc2
--- /dev/null
+++ b/eslint.config.js
@@ -0,0 +1,31 @@
+import js from '@eslint/js';
+import globals from 'globals';
+
+export default [
+  {
+    ignores: [
+      'src/test/webapp/**/*',
+      'dist',
+      'build',
+    ],
+  },
+  js.configs.recommended,
+  {
+    languageOptions: {
+      globals: {
+        ...globals.browser,
+        QUnit: true,
+        tests: true,
+      },
+    },
+    rules: {
+      'no-var': 'error',
+      'prefer-const': 'error',
+      'quotes': ['error', 'single', { 'avoidEscape': true, 'allowTemplateLiterals': true }],
+      'no-trailing-spaces': 'error',
+      'no-multiple-empty-lines': ['error', { 'max': 1 }],
+      'comma-dangle': ['error', 'always-multiline'],
+      'eol-last': ['error', 'always'],
+    },
+  },
+];
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 00000000..3c8605cc
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,5373 @@
+{
+    "name": "imsc",
+    "version": "1.1.5",
+    "lockfileVersion": 3,
+    "requires": true,
+    "packages": {
+        "": {
+            "name": "imsc",
+            "version": "1.1.5",
+            "license": "BSD-2-Clause",
+            "dependencies": {
+                "sax": "1.2.1"
+            },
+            "devDependencies": {
+                "@eslint/js": "^9.1.1",
+                "@rollup/plugin-commonjs": "^25.0.7",
+                "@rollup/plugin-node-resolve": "^15.2.3",
+                "@rollup/plugin-terser": "^0.4.4",
+                "eslint": "^9.1.1",
+                "filesaver.js-npm": "latest",
+                "globals": "^15.0.0",
+                "grunt": "latest",
+                "grunt-contrib-clean": "latest",
+                "grunt-exec": "^3.0.0",
+                "grunt-npmcopy": "latest",
+                "grunt-sync": "latest",
+                "jszip": "latest",
+                "node-qunit": "^1.0.0",
+                "qunit-assert-close": "latest",
+                "qunitjs": "latest",
+                "rollup": "^4.14.3",
+                "rollup-plugin-polyfill-node": "^0.13.0",
+                "tslib": "^2.6.2",
+                "typescript": "^5.4.5"
+            }
+        },
+        "node_modules/@eslint-community/eslint-utils": {
+            "version": "4.4.0",
+            "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.4.0.tgz",
+            "integrity": "sha512-1/sA4dwrzBAyeUoQ6oxahHKmrZvsnLCg4RfxW3ZFGGmQkSNQPFNLV9CUEFQP1x9EYXHTo5p6xdhZM1Ne9p/AfA==",
+            "dev": true,
+            "dependencies": {
+                "eslint-visitor-keys": "^3.3.0"
+            },
+            "engines": {
+                "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+            },
+            "peerDependencies": {
+                "eslint": "^6.0.0 || ^7.0.0 || >=8.0.0"
+            }
+        },
+        "node_modules/@eslint-community/eslint-utils/node_modules/eslint-visitor-keys": {
+            "version": "3.4.3",
+            "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-3.4.3.tgz",
+            "integrity": "sha512-wpc+LXeiyiisxPlEkUzU6svyS1frIO3Mgxj1fdy7Pm8Ygzguax2N3Fa/D/ag1WqbOprdI+uY6wMUl8/a2G+iag==",
+            "dev": true,
+            "engines": {
+                "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+            },
+            "funding": {
+                "url": "https://opencollective.com/eslint"
+            }
+        },
+        "node_modules/@eslint-community/regexpp": {
+            "version": "4.10.0",
+            "resolved": "https://registry.npmjs.org/@eslint-community/regexpp/-/regexpp-4.10.0.tgz",
+            "integrity": "sha512-Cu96Sd2By9mCNTx2iyKOmq10v22jUVQv0lQnlGNy16oE9589yE+QADPbrMGCkA51cKZSg3Pu/aTJVTGfL/qjUA==",
+            "dev": true,
+            "engines": {
+                "node": "^12.0.0 || ^14.0.0 || >=16.0.0"
+            }
+        },
+        "node_modules/@eslint/eslintrc": {
+            "version": "3.0.2",
+            "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-3.0.2.tgz",
+            "integrity": "sha512-wV19ZEGEMAC1eHgrS7UQPqsdEiCIbTKTasEfcXAigzoXICcqZSjBZEHlZwNVvKg6UBCjSlos84XiLqsRJnIcIg==",
+            "dev": true,
+            "dependencies": {
+                "ajv": "^6.12.4",
+                "debug": "^4.3.2",
+                "espree": "^10.0.1",
+                "globals": "^14.0.0",
+                "ignore": "^5.2.0",
+                "import-fresh": "^3.2.1",
+                "js-yaml": "^4.1.0",
+                "minimatch": "^3.1.2",
+                "strip-json-comments": "^3.1.1"
+            },
+            "engines": {
+                "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+            },
+            "funding": {
+                "url": "https://opencollective.com/eslint"
+            }
+        },
+        "node_modules/@eslint/eslintrc/node_modules/globals": {
+            "version": "14.0.0",
+            "resolved": "https://registry.npmjs.org/globals/-/globals-14.0.0.tgz",
+            "integrity": "sha512-oahGvuMGQlPw/ivIYBjVSrWAfWLBeku5tpPE2fOPLi+WHffIWbuh2tCjhyQhTBPMf5E9jDEH4FOmTYgYwbKwtQ==",
+            "dev": true,
+            "engines": {
+                "node": ">=18"
+            },
+            "funding": {
+                "url": "https://github.com/sponsors/sindresorhus"
+            }
+        },
+        "node_modules/@eslint/js": {
+            "version": "9.1.1",
+            "resolved": "https://registry.npmjs.org/@eslint/js/-/js-9.1.1.tgz",
+            "integrity": "sha512-5WoDz3Y19Bg2BnErkZTp0en+c/i9PvgFS7MBe1+m60HjFr0hrphlAGp4yzI7pxpt4xShln4ZyYp4neJm8hmOkQ==",
+            "dev": true,
+            "engines": {
+                "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+            }
+        },
+        "node_modules/@humanwhocodes/config-array": {
+            "version": "0.13.0",
+            "resolved": "https://registry.npmjs.org/@humanwhocodes/config-array/-/config-array-0.13.0.tgz",
+            "integrity": "sha512-DZLEEqFWQFiyK6h5YIeynKx7JlvCYWL0cImfSRXZ9l4Sg2efkFGTuFf6vzXjK1cq6IYkU+Eg/JizXw+TD2vRNw==",
+            "dev": true,
+            "dependencies": {
+                "@humanwhocodes/object-schema": "^2.0.3",
+                "debug": "^4.3.1",
+                "minimatch": "^3.0.5"
+            },
+            "engines": {
+                "node": ">=10.10.0"
+            }
+        },
+        "node_modules/@humanwhocodes/module-importer": {
+            "version": "1.0.1",
+            "resolved": "https://registry.npmjs.org/@humanwhocodes/module-importer/-/module-importer-1.0.1.tgz",
+            "integrity": "sha512-bxveV4V8v5Yb4ncFTT3rPSgZBOpCkjfK0y4oVVVJwIuDVBRMDXrPyXRL988i5ap9m9bnyEEjWfm5WkBmtffLfA==",
+            "dev": true,
+            "engines": {
+                "node": ">=12.22"
+            },
+            "funding": {
+                "type": "github",
+                "url": "https://github.com/sponsors/nzakas"
+            }
+        },
+        "node_modules/@humanwhocodes/object-schema": {
+            "version": "2.0.3",
+            "resolved": "https://registry.npmjs.org/@humanwhocodes/object-schema/-/object-schema-2.0.3.tgz",
+            "integrity": "sha512-93zYdMES/c1D69yZiKDBj0V24vqNzB/koF26KPaagAfd3P/4gUlh3Dys5ogAK+Exi9QyzlD8x/08Zt7wIKcDcA==",
+            "dev": true
+        },
+        "node_modules/@humanwhocodes/retry": {
+            "version": "0.2.3",
+            "resolved": "https://registry.npmjs.org/@humanwhocodes/retry/-/retry-0.2.3.tgz",
+            "integrity": "sha512-X38nUbachlb01YMlvPFojKoiXq+LzZvuSce70KPMPdeM1Rj03k4dR7lDslhbqXn3Ang4EU3+EAmwEAsbrjHW3g==",
+            "dev": true,
+            "engines": {
+                "node": ">=18.18"
+            },
+            "funding": {
+                "type": "github",
+                "url": "https://github.com/sponsors/nzakas"
+            }
+        },
+        "node_modules/@jridgewell/gen-mapping": {
+            "version": "0.3.5",
+            "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.5.tgz",
+            "integrity": "sha512-IzL8ZoEDIBRWEzlCcRhOaCupYyN5gdIK+Q6fbFdPDg6HqX6jpkItn7DFIpW9LQzXG6Df9sA7+OKnq0qlz/GaQg==",
+            "dev": true,
+            "dependencies": {
+                "@jridgewell/set-array": "^1.2.1",
+                "@jridgewell/sourcemap-codec": "^1.4.10",
+                "@jridgewell/trace-mapping": "^0.3.24"
+            },
+            "engines": {
+                "node": ">=6.0.0"
+            }
+        },
+        "node_modules/@jridgewell/resolve-uri": {
+            "version": "3.1.2",
+            "resolved": "https://registry.npmjs.org/@jridgewell/resolve-uri/-/resolve-uri-3.1.2.tgz",
+            "integrity": "sha512-bRISgCIjP20/tbWSPWMEi54QVPRZExkuD9lJL+UIxUKtwVJA8wW1Trb1jMs1RFXo1CBTNZ/5hpC9QvmKWdopKw==",
+            "dev": true,
+            "engines": {
+                "node": ">=6.0.0"
+            }
+        },
+        "node_modules/@jridgewell/set-array": {
+            "version": "1.2.1",
+            "resolved": "https://registry.npmjs.org/@jridgewell/set-array/-/set-array-1.2.1.tgz",
+            "integrity": "sha512-R8gLRTZeyp03ymzP/6Lil/28tGeGEzhx1q2k703KGWRAI1VdvPIXdG70VJc2pAMw3NA6JKL5hhFu1sJX0Mnn/A==",
+            "dev": true,
+            "engines": {
+                "node": ">=6.0.0"
+            }
+        },
+        "node_modules/@jridgewell/source-map": {
+            "version": "0.3.6",
+            "resolved": "https://registry.npmjs.org/@jridgewell/source-map/-/source-map-0.3.6.tgz",
+            "integrity": "sha512-1ZJTZebgqllO79ue2bm3rIGud/bOe0pP5BjSRCRxxYkEZS8STV7zN84UBbiYu7jy+eCKSnVIUgoWWE/tt+shMQ==",
+            "dev": true,
+            "dependencies": {
+                "@jridgewell/gen-mapping": "^0.3.5",
+                "@jridgewell/trace-mapping": "^0.3.25"
+            }
+        },
+        "node_modules/@jridgewell/sourcemap-codec": {
+            "version": "1.4.15",
+            "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.4.15.tgz",
+            "integrity": "sha512-eF2rxCRulEKXHTRiDrDy6erMYWqNw4LPdQ8UQA4huuxaQsVeRPFl2oM8oDGxMFhJUWZf9McpLtJasDDZb/Bpeg==",
+            "dev": true
+        },
+        "node_modules/@jridgewell/trace-mapping": {
+            "version": "0.3.25",
+            "resolved": "https://registry.npmjs.org/@jridgewell/trace-mapping/-/trace-mapping-0.3.25.tgz",
+            "integrity": "sha512-vNk6aEwybGtawWmy/PzwnGDOjCkLWSD2wqvjGGAgOAwCGWySYXfYoxt00IJkTF+8Lb57DwOb3Aa0o9CApepiYQ==",
+            "dev": true,
+            "dependencies": {
+                "@jridgewell/resolve-uri": "^3.1.0",
+                "@jridgewell/sourcemap-codec": "^1.4.14"
+            }
+        },
+        "node_modules/@nodelib/fs.scandir": {
+            "version": "2.1.5",
+            "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz",
+            "integrity": "sha512-vq24Bq3ym5HEQm2NKCr3yXDwjc7vTsEThRDnkp2DK9p1uqLR+DHurm/NOTo0KG7HYHU7eppKZj3MyqYuMBf62g==",
+            "dev": true,
+            "dependencies": {
+                "@nodelib/fs.stat": "2.0.5",
+                "run-parallel": "^1.1.9"
+            },
+            "engines": {
+                "node": ">= 8"
+            }
+        },
+        "node_modules/@nodelib/fs.stat": {
+            "version": "2.0.5",
+            "resolved": "https://registry.npmjs.org/@nodelib/fs.stat/-/fs.stat-2.0.5.tgz",
+            "integrity": "sha512-RkhPPp2zrqDAQA/2jNhnztcPAlv64XdhIp7a7454A5ovI7Bukxgt7MX7udwAu3zg1DcpPU0rz3VV1SeaqvY4+A==",
+            "dev": true,
+            "engines": {
+                "node": ">= 8"
+            }
+        },
+        "node_modules/@nodelib/fs.walk": {
+            "version": "1.2.8",
+            "resolved": "https://registry.npmjs.org/@nodelib/fs.walk/-/fs.walk-1.2.8.tgz",
+            "integrity": "sha512-oGB+UxlgWcgQkgwo8GcEGwemoTFt3FIO9ababBmaGwXIoBKZ+GTy0pP185beGg7Llih/NSHSV2XAs1lnznocSg==",
+            "dev": true,
+            "dependencies": {
+                "@nodelib/fs.scandir": "2.1.5",
+                "fastq": "^1.6.0"
+            },
+            "engines": {
+                "node": ">= 8"
+            }
+        },
+        "node_modules/@rollup/plugin-commonjs": {
+            "version": "25.0.7",
+            "resolved": "https://registry.npmjs.org/@rollup/plugin-commonjs/-/plugin-commonjs-25.0.7.tgz",
+            "integrity": "sha512-nEvcR+LRjEjsaSsc4x3XZfCCvZIaSMenZu/OiwOKGN2UhQpAYI7ru7czFvyWbErlpoGjnSX3D5Ch5FcMA3kRWQ==",
+            "dev": true,
+            "dependencies": {
+                "@rollup/pluginutils": "^5.0.1",
+                "commondir": "^1.0.1",
+                "estree-walker": "^2.0.2",
+                "glob": "^8.0.3",
+                "is-reference": "1.2.1",
+                "magic-string": "^0.30.3"
+            },
+            "engines": {
+                "node": ">=14.0.0"
+            },
+            "peerDependencies": {
+                "rollup": "^2.68.0||^3.0.0||^4.0.0"
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+            "dev": true,
+            "dependencies": {
+                "is-buffer": "^1.1.5"
+            },
+            "engines": {
+                "node": ">=0.10.0"
+            }
+        },
+        "node_modules/to-regex": {
+            "version": "3.0.2",
+            "resolved": "https://registry.npmjs.org/to-regex/-/to-regex-3.0.2.tgz",
+            "integrity": "sha512-FWtleNAtZ/Ki2qtqej2CXTOayOH9bHDQF+Q48VpWyDXjbYxA4Yz8iDB31zXOBUlOHHKidDbqGVrTUvQMPmBGBw==",
+            "dev": true,
+            "dependencies": {
+                "define-property": "^2.0.2",
+                "extend-shallow": "^3.0.2",
+                "regex-not": "^1.0.2",
+                "safe-regex": "^1.1.0"
+            },
+            "engines": {
+                "node": ">=0.10.0"
+            }
+        },
+        "node_modules/to-regex-range": {
+            "version": "5.0.1",
+            "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
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+            "dev": true,
+            "dependencies": {
+                "is-number": "^7.0.0"
+            },
+            "engines": {
+                "node": ">=8.0"
+            }
+        },
+        "node_modules/tracejs": {
+            "version": "0.1.8",
+            "resolved": "https://registry.npmjs.org/tracejs/-/tracejs-0.1.8.tgz",
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+            "dev": true,
+            "engines": {
+                "node": ">=0.4.0"
+            }
+        },
+        "node_modules/tslib": {
+            "version": "2.6.2",
+            "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.6.2.tgz",
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+            "dev": true
+        },
+        "node_modules/type-check": {
+            "version": "0.4.0",
+            "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
+            "integrity": "sha512-XleUoc9uwGXqjWwXaUTZAmzMcFZ5858QA2vvx1Ur5xIcixXIP+8LnFDgRplU30us6teqdlskFfu+ae4K79Ooew==",
+            "dev": true,
+            "dependencies": {
+                "prelude-ls": "^1.2.1"
+            },
+            "engines": {
+                "node": ">= 0.8.0"
+            }
+        },
+        "node_modules/typescript": {
+            "version": "5.4.5",
+            "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.4.5.tgz",
+            "integrity": "sha512-vcI4UpRgg81oIRUFwR0WSIHKt11nJ7SAVlYNIu+QpqeyXP+gpQJy/Z4+F0aGxSE4MqwjyXvW/TzgkLAx2AGHwQ==",
+            "dev": true,
+            "bin": {
+                "tsc": "bin/tsc",
+                "tsserver": "bin/tsserver"
+            },
+            "engines": {
+                "node": ">=14.17"
+            }
+        },
+        "node_modules/uglify-js": {
+            "version": "3.17.4",
+            "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.17.4.tgz",
+            "integrity": "sha512-T9q82TJI9e/C1TAxYvfb16xO120tMVFZrGA3f9/P4424DNu6ypK103y0GPFVa17yotwSyZW5iYXgjYHkGrJW/g==",
+            "dev": true,
+            "optional": true,
+            "bin": {
+                "uglifyjs": "bin/uglifyjs"
+            },
+            "engines": {
+                "node": ">=0.8.0"
+            }
+        },
+        "node_modules/unc-path-regex": {
+            "version": "0.1.2",
+            "resolved": "https://registry.npmjs.org/unc-path-regex/-/unc-path-regex-0.1.2.tgz",
+            "integrity": "sha512-eXL4nmJT7oCpkZsHZUOJo8hcX3GbsiDOa0Qu9F646fi8dT3XuSVopVqAcEiVzSKKH7UoDti23wNX3qGFxcW5Qg==",
+            "dev": true,
+            "engines": {
+                "node": ">=0.10.0"
+            }
+        },
+        "node_modules/underscore": {
+            "version": "1.13.6",
+            "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.13.6.tgz",
+            "integrity": "sha512-+A5Sja4HP1M08MaXya7p5LvjuM7K6q/2EaC0+iovj/wOcMsTzMvDFbasi/oSapiwOlt252IqsKqPjCl7huKS0A==",
+            "dev": true
+        },
+        "node_modules/underscore.string": {
+            "version": "3.3.6",
+            "resolved": "https://registry.npmjs.org/underscore.string/-/underscore.string-3.3.6.tgz",
+            "integrity": "sha512-VoC83HWXmCrF6rgkyxS9GHv8W9Q5nhMKho+OadDJGzL2oDYbYEppBaCMH6pFlwLeqj2QS+hhkw2kpXkSdD1JxQ==",
+            "dev": true,
+            "dependencies": {
+                "sprintf-js": "^1.1.1",
+                "util-deprecate": "^1.0.2"
+            },
+            "engines": {
+                "node": "*"
+            }
+        },
+        "node_modules/union-value": {
+            "version": "1.0.1",
+            "resolved": "https://registry.npmjs.org/union-value/-/union-value-1.0.1.tgz",
+            "integrity": "sha512-tJfXmxMeWYnczCVs7XAEvIV7ieppALdyepWMkHkwciRpZraG/xwT+s2JN8+pr1+8jCRf80FFzvr+MpQeeoF4Xg==",
+            "dev": true,
+            "dependencies": {
+                "arr-union": "^3.1.0",
+                "get-value": "^2.0.6",
+                "is-extendable": "^0.1.1",
+                "set-value": "^2.0.1"
+            },
+            "engines": {
+                "node": ">=0.10.0"
+            }
+        },
+        "node_modules/universalify": {
+            "version": "0.1.2",
+            "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
+            "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg==",
+            "dev": true,
+            "engines": {
+                "node": ">= 4.0.0"
+            }
+        },
+        "node_modules/unset-value": {
+            "version": "1.0.0",
+            "resolved": "https://registry.npmjs.org/unset-value/-/unset-value-1.0.0.tgz",
+            "integrity": "sha512-PcA2tsuGSF9cnySLHTLSh2qrQiJ70mn+r+Glzxv2TWZblxsxCC52BDlZoPCsz7STd9pN7EZetkWZBAvk4cgZdQ==",
+            "dev": true,
+            "dependencies": {
+                "has-value": "^0.3.1",
+                "isobject": "^3.0.0"
+            },
+            "engines": {
+                "node": ">=0.10.0"
+            }
+        },
+        "node_modules/unset-value/node_modules/has-value": {
+            "version": "0.3.1",
+            "resolved": "https://registry.npmjs.org/has-value/-/has-value-0.3.1.tgz",
+            "integrity": "sha512-gpG936j8/MzaeID5Yif+577c17TxaDmhuyVgSwtnL/q8UUTySg8Mecb+8Cf1otgLoD7DDH75axp86ER7LFsf3Q==",
+            "dev": true,
+            "dependencies": {
+                "get-value": "^2.0.3",
+                "has-values": "^0.1.4",
+                "isobject": "^2.0.0"
+            },
+            "engines": {
+                "node": ">=0.10.0"
+            }
+        },
+        "node_modules/unset-value/node_modules/has-value/node_modules/isobject": {
+            "version": "2.1.0",
+            "resolved": "https://registry.npmjs.org/isobject/-/isobject-2.1.0.tgz",
+            "integrity": "sha512-+OUdGJlgjOBZDfxnDjYYG6zp487z0JGNQq3cYQYg5f5hKR+syHMsaztzGeml/4kGG55CSpKSpWTY+jYGgsHLgA==",
+            "dev": true,
+            "dependencies": {
+                "isarray": "1.0.0"
+            },
+            "engines": {
+                "node": ">=0.10.0"
+            }
+        },
+        "node_modules/unset-value/node_modules/has-values": {
+            "version": "0.1.4",
+            "resolved": "https://registry.npmjs.org/has-values/-/has-values-0.1.4.tgz",
+            "integrity": "sha512-J8S0cEdWuQbqD9//tlZxiMuMNmxB8PlEwvYwuxsTmR1G5RXUePEX/SJn7aD0GMLieuZYSwNH0cQuJGwnYunXRQ==",
+            "dev": true,
+            "engines": {
+                "node": ">=0.10.0"
+            }
+        },
+        "node_modules/uri-js": {
+            "version": "4.4.1",
+            "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz",
+            "integrity": "sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==",
+            "dev": true,
+            "dependencies": {
+                "punycode": "^2.1.0"
+            }
+        },
+        "node_modules/urix": {
+            "version": "0.1.0",
+            "resolved": "https://registry.npmjs.org/urix/-/urix-0.1.0.tgz",
+            "integrity": "sha512-Am1ousAhSLBeB9cG/7k7r2R0zj50uDRlZHPGbazid5s9rlF1F/QKYObEKSIunSjIOkJZqwRRLpvewjEkM7pSqg==",
+            "deprecated": "Please see https://github.com/lydell/urix#deprecated",
+            "dev": true
+        },
+        "node_modules/use": {
+            "version": "3.1.1",
+            "resolved": "https://registry.npmjs.org/use/-/use-3.1.1.tgz",
+            "integrity": "sha512-cwESVXlO3url9YWlFW/TA9cshCEhtu7IKJ/p5soJ/gGpj7vbvFrAY/eIioQ6Dw23KjZhYgiIo8HOs1nQ2vr/oQ==",
+            "dev": true,
+            "engines": {
+                "node": ">=0.10.0"
+            }
+        },
+        "node_modules/util-deprecate": {
+            "version": "1.0.2",
+            "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+            "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
+            "dev": true
+        },
+        "node_modules/v8flags": {
+            "version": "3.2.0",
+            "resolved": "https://registry.npmjs.org/v8flags/-/v8flags-3.2.0.tgz",
+            "integrity": "sha512-mH8etigqMfiGWdeXpaaqGfs6BndypxusHHcv2qSHyZkGEznCd/qAXCWWRzeowtL54147cktFOC4P5y+kl8d8Jg==",
+            "dev": true,
+            "dependencies": {
+                "homedir-polyfill": "^1.0.1"
+            },
+            "engines": {
+                "node": ">= 0.10"
+            }
+        },
+        "node_modules/walk-sync": {
+            "version": "0.3.1",
+            "resolved": "https://registry.npmjs.org/walk-sync/-/walk-sync-0.3.1.tgz",
+            "integrity": "sha512-WRHxHjRh4AR0MhPqafaWwemTl8ooNWkI/v/724d+kn0NvN+KjsDZTgwXRlsV/Hfg+mtF9bz1MhNgeqq54JuFTg==",
+            "dev": true,
+            "dependencies": {
+                "ensure-posix-path": "^1.0.0",
+                "matcher-collection": "^1.0.0"
+            }
+        },
+        "node_modules/which": {
+            "version": "2.0.2",
+            "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
+            "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
+            "dev": true,
+            "dependencies": {
+                "isexe": "^2.0.0"
+            },
+            "bin": {
+                "node-which": "bin/node-which"
+            },
+            "engines": {
+                "node": ">= 8"
+            }
+        },
+        "node_modules/word-wrap": {
+            "version": "1.2.5",
+            "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.5.tgz",
+            "integrity": "sha512-BN22B5eaMMI9UMtjrGd5g5eCYPpCPDUy0FJXbYsaT5zYxjFOckS53SQDE3pWkVoWpHXVb3BrYcEN4Twa55B5cA==",
+            "dev": true,
+            "engines": {
+                "node": ">=0.10.0"
+            }
+        },
+        "node_modules/wordwrap": {
+            "version": "1.0.0",
+            "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
+            "integrity": "sha512-gvVzJFlPycKc5dZN4yPkP8w7Dc37BtP1yczEneOb4uq34pXZcvrtRTmWV8W+Ume+XCxKgbjM+nevkyFPMybd4Q==",
+            "dev": true,
+            "optional": true
+        },
+        "node_modules/wrappy": {
+            "version": "1.0.2",
+            "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+            "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
+            "dev": true
+        },
+        "node_modules/yocto-queue": {
+            "version": "0.1.0",
+            "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
+            "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==",
+            "dev": true,
+            "engines": {
+                "node": ">=10"
+            },
+            "funding": {
+                "url": "https://github.com/sponsors/sindresorhus"
+            }
+        }
+    }
+}
diff --git a/package.json b/package.json
index cce458a1..e4367127 100644
--- a/package.json
+++ b/package.json
@@ -6,6 +6,7 @@
     "homepage": "https://github.com/sandflow/imscJS",
     "bugs": "https://github.com/sandflow/imscJS/issues",
     "repository": "github:sandflow/imscJS",
+    "type": "module",
     "files": [
         "src/main/js",
         "README.txt",
@@ -24,28 +25,37 @@
         "imsc"
     ],
     "author": "Pierre-Anthony Lemieux <pal@sandflow.com>",
-    "main": "src/main/js/main.js",
+    "main": "dist/main/js/main.js",
+    "types": "dist/main/js/main.d.ts",
     "unpkg": "dist/imsc.min.js",
     "scripts": {
-        "prepublishOnly": "grunt build:release"
+        "prepublishOnly": "grunt build:release",
+        "dev": "npx http-server build/public_html",
+        "fix": "eslint --fix src"
     },
     "dependencies": {
         "sax": "1.2.1"
     },
     "devDependencies": {
-        "browserify": "^16.2.3",
+        "@eslint/js": "^9.1.1",
+        "@rollup/plugin-commonjs": "^25.0.7",
+        "@rollup/plugin-node-resolve": "^15.2.3",
+        "@rollup/plugin-terser": "^0.4.4",
+        "eslint": "^9.1.1",
         "filesaver.js-npm": "latest",
-        "google-closure-compiler": "^20180910.1.0",
+        "globals": "^15.0.0",
         "grunt": "latest",
-        "grunt-browserify": "latest",
         "grunt-contrib-clean": "latest",
-        "grunt-contrib-jshint": "latest",
         "grunt-exec": "^3.0.0",
         "grunt-npmcopy": "latest",
         "grunt-sync": "latest",
         "jszip": "latest",
         "node-qunit": "^1.0.0",
         "qunit-assert-close": "latest",
-        "qunitjs": "latest"
+        "qunitjs": "latest",
+        "rollup": "^4.14.3",
+        "rollup-plugin-polyfill-node": "^0.13.0",
+        "tslib": "^2.6.2",
+        "typescript": "^5.4.5"
     }
 }
diff --git a/rollup.config.js b/rollup.config.js
new file mode 100644
index 00000000..9b7405ce
--- /dev/null
+++ b/rollup.config.js
@@ -0,0 +1,67 @@
+import commonjs from '@rollup/plugin-commonjs';
+import nodeResolve from '@rollup/plugin-node-resolve';
+import terser from '@rollup/plugin-terser';
+import nodePolyfill from 'rollup-plugin-polyfill-node';
+
+export default [
+  // debug
+  {
+    input: 'dist/main/main.js',
+    external: ['sax'],
+    plugins: [
+      commonjs({
+        sourceMap: true,
+      }),
+      nodeResolve({
+        preferBuiltins: true,
+        browser: true,
+      }),
+      nodePolyfill(),
+    ],
+    output: [{
+      file: 'dist/imsc.debug.js',
+      format: 'umd',
+      name: 'imsc',
+      sourcemap: true,
+      globals: {
+        sax: 'sax',
+      },
+    }, {
+      file: 'dist/imsc.min.js',
+      format: 'umd',
+      name: 'imsc',
+      sourcemap: true,
+      globals: {
+        sax: 'sax',
+      },
+      plugins: [terser()],
+    }],
+  },
+
+  // all
+  {
+    input: 'dist/main/main.js',
+    plugins: [
+      commonjs({
+        sourceMap: true,
+      }),
+      nodeResolve({
+        preferBuiltins: true,
+        browser: true,
+      }),
+      nodePolyfill(),
+    ],
+    output: [{
+      file: 'dist/imsc.all.debug.js',
+      format: 'umd',
+      name: 'imsc',
+      sourcemap: true,
+    }, {
+      file: 'dist/imsc.all.min.js',
+      format: 'umd',
+      name: 'imsc',
+      sourcemap: true,
+      plugins: [terser()],
+    }],
+  },
+];
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 00000000..8a728db1
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,48 @@
+{
+  "compilerOptions": {
+    "allowJs": true,
+    "allowSyntheticDefaultImports": true,
+    "declaration": true,
+    "declarationMap": true,
+    "esModuleInterop": true,
+    "experimentalDecorators": true,
+    "forceConsistentCasingInFileNames": true,
+    "importHelpers": true,
+    "incremental": true,
+    "inlineSources": true,
+    "isolatedModules": true,
+    "lib": [
+      "DOM",
+      "DOM.Iterable",
+      "ESNext",
+    ],
+    "module": "ESNEXT",
+    "moduleResolution": "node",
+    "noImplicitAny": true,
+    "noImplicitOverride": true,
+    "noImplicitReturns": true,
+    "noImplicitThis": true,
+    "noPropertyAccessFromIndexSignature": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "outDir": "./dist/main",
+    "preserveConstEnums": true,
+    "removeComments": false,
+    "resolveJsonModule": true,
+    "sourceMap": true,
+    "strict": true,
+    "strictBindCallApply": true,
+    "strictFunctionTypes": true,
+    "strictNullChecks": true,
+    "strictPropertyInitialization": true,
+    "target": "ES5",
+  },
+  "include": [
+    "src/main"
+  ],
+  "exclude": [
+    "**/dist",
+    "**/build",
+    "**/node_modules"
+  ]
+}

From a533990870614a4333f2fffeab4c0606b6a0e6f6 Mon Sep 17 00:00:00 2001
From: Casey Occhialini <1508707+littlespex@users.noreply.github.com>
Date: Wed, 1 May 2024 09:25:35 -0700
Subject: [PATCH 05/21] Update Gruntfile.cjs

Co-authored-by: Pierre-Anthony Lemieux <pal@sandflow.com>
---
 Gruntfile.cjs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Gruntfile.cjs b/Gruntfile.cjs
index 0333d746..14ee2113 100644
--- a/Gruntfile.cjs
+++ b/Gruntfile.cjs
@@ -59,7 +59,7 @@ module.exports = function (grunt) {
             },
 
             bundle: {
-                cmd: 'rollup -c rollup.config.js',
+                cmd: 'npx rollup -c rollup.config.js',
             },
         },
     },

From e2f474d4f3b4ed2ab8933ba7341de94486cdbd0c Mon Sep 17 00:00:00 2001
From: Casey Occhialini <1508707+littlespex@users.noreply.github.com>
Date: Wed, 1 May 2024 09:25:39 -0700
Subject: [PATCH 06/21] Update Gruntfile.cjs

Co-authored-by: Pierre-Anthony Lemieux <pal@sandflow.com>
---
 Gruntfile.cjs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Gruntfile.cjs b/Gruntfile.cjs
index 14ee2113..9b62395f 100644
--- a/Gruntfile.cjs
+++ b/Gruntfile.cjs
@@ -55,7 +55,7 @@ module.exports = function (grunt) {
             },
 
             lint: {
-                cmd: 'eslint src',
+                cmd: 'npx eslint src',
             },
 
             bundle: {

From bef19cf01984262a3d654dc40b1b3e5d6282c620 Mon Sep 17 00:00:00 2001
From: Casey Occhialini <1508707+littlespex@users.noreply.github.com>
Date: Wed, 1 May 2024 09:25:43 -0700
Subject: [PATCH 07/21] Update eslint.config.js

Co-authored-by: Pierre-Anthony Lemieux <pal@sandflow.com>
---
 eslint.config.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/eslint.config.js b/eslint.config.js
index 60ea9fc2..f8866302 100644
--- a/eslint.config.js
+++ b/eslint.config.js
@@ -21,7 +21,7 @@ export default [
     rules: {
       'no-var': 'error',
       'prefer-const': 'error',
-      'quotes': ['error', 'single', { 'avoidEscape': true, 'allowTemplateLiterals': true }],
+      'quotes': ['error', 'double', { 'avoidEscape': true, 'allowTemplateLiterals': true }],
       'no-trailing-spaces': 'error',
       'no-multiple-empty-lines': ['error', { 'max': 1 }],
       'comma-dangle': ['error', 'always-multiline'],

From 95cd6f6f92b78ca3465d3baee5be0f99f31e51a1 Mon Sep 17 00:00:00 2001
From: Casey Occhialini <1508707+littlespex@users.noreply.github.com>
Date: Wed, 1 May 2024 09:27:11 -0700
Subject: [PATCH 08/21] fix: remove bad import

---
 Gruntfile.cjs                      |  62 +--
 eslint.config.js                   |  24 +-
 rollup.config.js                   |  42 +-
 src/main/js/doc.js                 | 244 ++++++------
 src/main/js/html.js                | 596 ++++++++++++++---------------
 src/main/js/isd.js                 | 142 +++----
 src/main/js/main.js                |   6 +-
 src/main/js/names.js               |  16 +-
 src/main/js/styles.js              | 354 ++++++++---------
 src/main/js/utils.js               |  44 +--
 src/test/js/ParseColor.js          |  62 +--
 src/test/js/ParsePositionTest.js   | 128 +++----
 src/test/js/ParseTextShadowTest.js |   8 +-
 13 files changed, 864 insertions(+), 864 deletions(-)

diff --git a/Gruntfile.cjs b/Gruntfile.cjs
index 9b62395f..95c0268f 100644
--- a/Gruntfile.cjs
+++ b/Gruntfile.cjs
@@ -2,48 +2,48 @@ module.exports = function (grunt) {
 
     grunt.initConfig({
 
-        properties: grunt.file.readJSON('properties.json'),
+        properties: grunt.file.readJSON("properties.json"),
 
-        pkg: grunt.file.readJSON('package.json'),
+        pkg: grunt.file.readJSON("package.json"),
 
-        clean: ['<%= properties.webappBuildDir %>', '<%= properties.umdBuildDir %>'],
+        clean: ["<%= properties.webappBuildDir %>", "<%= properties.umdBuildDir %>"],
 
         sync: {
             all: {
                 files:
                     [
                         // copy tests
-                        { expand: true, cwd: '<%= properties.webappTestDir %>', src: '**', dest: '<%= properties.webappBuildDir %>' },
+                        { expand: true, cwd: "<%= properties.webappTestDir %>", src: "**", dest: "<%= properties.webappBuildDir %>" },
 
                         // copy tests resources
-                        { expand: true, cwd: '<%= properties.unitTestsResourcesDir %>', src: 'imsc-tests/imsc1/ttml/**', dest: '<%= properties.webappBuildDir %>' },
-                        { expand: true, cwd: '<%= properties.unitTestsResourcesDir %>', src: 'imsc-tests/imsc1/tests.json', dest: '<%= properties.webappBuildDir %>' },
-                        { expand: true, cwd: '<%= properties.unitTestsResourcesDir %>', src: 'imsc-tests/imsc1_1/ttml/**', dest: '<%= properties.webappBuildDir %>' },
-                        { expand: true, cwd: '<%= properties.unitTestsResourcesDir %>', src: 'imsc-tests/imsc1_1/tests.json', dest: '<%= properties.webappBuildDir %>' },
-                        { expand: true, cwd: '<%= properties.unitTestsResourcesDir %>', src: 'unit-tests/**', dest: '<%= properties.webappBuildDir %>' },
+                        { expand: true, cwd: "<%= properties.unitTestsResourcesDir %>", src: "imsc-tests/imsc1/ttml/**", dest: "<%= properties.webappBuildDir %>" },
+                        { expand: true, cwd: "<%= properties.unitTestsResourcesDir %>", src: "imsc-tests/imsc1/tests.json", dest: "<%= properties.webappBuildDir %>" },
+                        { expand: true, cwd: "<%= properties.unitTestsResourcesDir %>", src: "imsc-tests/imsc1_1/ttml/**", dest: "<%= properties.webappBuildDir %>" },
+                        { expand: true, cwd: "<%= properties.unitTestsResourcesDir %>", src: "imsc-tests/imsc1_1/tests.json", dest: "<%= properties.webappBuildDir %>" },
+                        { expand: true, cwd: "<%= properties.unitTestsResourcesDir %>", src: "unit-tests/**", dest: "<%= properties.webappBuildDir %>" },
                     ],
             },
 
             release: {
-                src: '<%= properties.umdBuildDir %>/<%= properties.umdMinName %>',
-                dest: '<%= properties.webappBuildDir %>/libs/imsc.js',
+                src: "<%= properties.umdBuildDir %>/<%= properties.umdMinName %>",
+                dest: "<%= properties.webappBuildDir %>/libs/imsc.js",
             },
 
             debug: {
-                src: '<%= properties.umdBuildDir %>/<%= properties.umdDebugName %>',
-                dest: '<%= properties.webappBuildDir %>/libs/imsc.js',
+                src: "<%= properties.umdBuildDir %>/<%= properties.umdDebugName %>",
+                dest: "<%= properties.webappBuildDir %>/libs/imsc.js",
             },
         },
 
         npmcopy: {
             default: {
                 files: {
-                    '<%= properties.webappBuildDir %>/libs/': [
-                        'sax:main',
-                        'qunit-assert-close:main',
-                        'qunitjs:main',
-                        'filesaver.js-npm:main',
-                        'jszip/dist/jszip.js',
+                    "<%= properties.webappBuildDir %>/libs/": [
+                        "sax:main",
+                        "qunit-assert-close:main",
+                        "qunitjs:main",
+                        "filesaver.js-npm:main",
+                        "jszip/dist/jszip.js",
                     ],
                 },
             },
@@ -51,37 +51,37 @@ module.exports = function (grunt) {
 
         exec: {
             compile: {
-                cmd: 'tsc',
+                cmd: "tsc",
             },
 
             lint: {
-                cmd: 'npx eslint src',
+                cmd: "npx eslint src",
             },
 
             bundle: {
-                cmd: 'npx rollup -c rollup.config.js',
+                cmd: "npx rollup -c rollup.config.js",
             },
         },
     },
 
     );
 
-    grunt.loadNpmTasks('grunt-contrib-clean');
+    grunt.loadNpmTasks("grunt-contrib-clean");
 
-    grunt.loadNpmTasks('grunt-npmcopy');
+    grunt.loadNpmTasks("grunt-npmcopy");
 
-    grunt.loadNpmTasks('grunt-sync');
+    grunt.loadNpmTasks("grunt-sync");
 
-    grunt.loadNpmTasks('grunt-exec');
+    grunt.loadNpmTasks("grunt-exec");
 
-    grunt.registerTask('lint', ['exec:lint']);
+    grunt.registerTask("lint", ["exec:lint"]);
 
-    grunt.registerTask('build:release', ['lint', 'exec:compile', 'exec:bundle', 'sync:all', 'sync:release', 'npmcopy']);
+    grunt.registerTask("build:release", ["lint", "exec:compile", "exec:bundle", "sync:all", "sync:release", "npmcopy"]);
 
-    grunt.registerTask('build:debug', ['lint', 'exec:compile', 'exec:bundle', 'sync:all', 'sync:debug', 'npmcopy']);
+    grunt.registerTask("build:debug", ["lint", "exec:compile", "exec:bundle", "sync:all", "sync:debug", "npmcopy"]);
 
-    grunt.registerTask('build', ['build:debug']);
+    grunt.registerTask("build", ["build:debug"]);
 
-    grunt.registerTask('clean', ['clean']);
+    grunt.registerTask("clean", ["clean"]);
 
 };
diff --git a/eslint.config.js b/eslint.config.js
index f8866302..ae82d107 100644
--- a/eslint.config.js
+++ b/eslint.config.js
@@ -1,12 +1,12 @@
-import js from '@eslint/js';
-import globals from 'globals';
+import js from "@eslint/js";
+import globals from "globals";
 
 export default [
   {
     ignores: [
-      'src/test/webapp/**/*',
-      'dist',
-      'build',
+      "src/test/webapp/**/*",
+      "dist",
+      "build",
     ],
   },
   js.configs.recommended,
@@ -19,13 +19,13 @@ export default [
       },
     },
     rules: {
-      'no-var': 'error',
-      'prefer-const': 'error',
-      'quotes': ['error', 'double', { 'avoidEscape': true, 'allowTemplateLiterals': true }],
-      'no-trailing-spaces': 'error',
-      'no-multiple-empty-lines': ['error', { 'max': 1 }],
-      'comma-dangle': ['error', 'always-multiline'],
-      'eol-last': ['error', 'always'],
+      "no-var": "error",
+      "prefer-const": "error",
+      "quotes": ["error", "double", { "avoidEscape": true, "allowTemplateLiterals": true }],
+      "no-trailing-spaces": "error",
+      "no-multiple-empty-lines": ["error", { "max": 1 }],
+      "comma-dangle": ["error", "always-multiline"],
+      "eol-last": ["error", "always"],
     },
   },
 ];
diff --git a/rollup.config.js b/rollup.config.js
index 9b7405ce..c3339f46 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -1,13 +1,13 @@
-import commonjs from '@rollup/plugin-commonjs';
-import nodeResolve from '@rollup/plugin-node-resolve';
-import terser from '@rollup/plugin-terser';
-import nodePolyfill from 'rollup-plugin-polyfill-node';
+import commonjs from "@rollup/plugin-commonjs";
+import nodeResolve from "@rollup/plugin-node-resolve";
+import terser from "@rollup/plugin-terser";
+import nodePolyfill from "rollup-plugin-polyfill-node";
 
 export default [
   // debug
   {
-    input: 'dist/main/main.js',
-    external: ['sax'],
+    input: "dist/main/main.js",
+    external: ["sax"],
     plugins: [
       commonjs({
         sourceMap: true,
@@ -19,20 +19,20 @@ export default [
       nodePolyfill(),
     ],
     output: [{
-      file: 'dist/imsc.debug.js',
-      format: 'umd',
-      name: 'imsc',
+      file: "dist/imsc.debug.js",
+      format: "umd",
+      name: "imsc",
       sourcemap: true,
       globals: {
-        sax: 'sax',
+        sax: "sax",
       },
     }, {
-      file: 'dist/imsc.min.js',
-      format: 'umd',
-      name: 'imsc',
+      file: "dist/imsc.min.js",
+      format: "umd",
+      name: "imsc",
       sourcemap: true,
       globals: {
-        sax: 'sax',
+        sax: "sax",
       },
       plugins: [terser()],
     }],
@@ -40,7 +40,7 @@ export default [
 
   // all
   {
-    input: 'dist/main/main.js',
+    input: "dist/main/main.js",
     plugins: [
       commonjs({
         sourceMap: true,
@@ -52,14 +52,14 @@ export default [
       nodePolyfill(),
     ],
     output: [{
-      file: 'dist/imsc.all.debug.js',
-      format: 'umd',
-      name: 'imsc',
+      file: "dist/imsc.all.debug.js",
+      format: "umd",
+      name: "imsc",
       sourcemap: true,
     }, {
-      file: 'dist/imsc.all.min.js',
-      format: 'umd',
-      name: 'imsc',
+      file: "dist/imsc.all.min.js",
+      format: "umd",
+      name: "imsc",
       sourcemap: true,
       plugins: [terser()],
     }],
diff --git a/src/main/js/doc.js b/src/main/js/doc.js
index b9abb237..e73b6bdb 100644
--- a/src/main/js/doc.js
+++ b/src/main/js/doc.js
@@ -24,11 +24,11 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-import sax from 'sax';
-import { reportError, reportFatal, reportWarning } from './error.js';
-import { ns_ebutts, ns_ittp, ns_itts, ns_tt, ns_ttp, ns_tts } from './names.js';
-import { byName, byQName } from './styles.js';
-import { ComputedLength, hasOwnProperty, parseLength } from './utils.js';
+import sax from "sax";
+import { reportError, reportFatal, reportWarning } from "./error.js";
+import { ns_ebutts, ns_ittp, ns_itts, ns_tt, ns_ttp, ns_tts } from "./names.js";
+import { byName, byQName } from "./styles.js";
+import { ComputedLength, hasOwnProperty, parseLength } from "./utils.js";
 
 /**
  * @module imscDoc
@@ -150,7 +150,7 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
         } else if (estack[0] instanceof ForeignElement) {
 
             if (estack[0].node.uri === ns_tt &&
-                estack[0].node.local === 'metadata') {
+                estack[0].node.local === "metadata") {
 
                 /* leave the metadata element */
 
@@ -158,7 +158,7 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
 
             } else if (metadata_depth > 0 &&
                 metadataHandler &&
-                'onCloseTag' in metadataHandler) {
+                "onCloseTag" in metadataHandler) {
 
                 /* end of child of metadata element */
 
@@ -197,7 +197,7 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
 
                 const ruby = estack[0].styleAttrs[byName.ruby.qname];
 
-                if (ruby === 'container' || ruby === 'textContainer' || ruby === 'baseContainer') {
+                if (ruby === "container" || ruby === "textContainer" || ruby === "baseContainer") {
 
                     return;
 
@@ -216,7 +216,7 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
         } else if (estack[0] instanceof ForeignElement &&
             metadata_depth > 0 &&
             metadataHandler &&
-            'onText' in metadataHandler) {
+            "onText" in metadataHandler) {
 
             /* text node within a child of metadata element */
 
@@ -230,7 +230,7 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
 
         // maintain the xml:space stack
 
-        const xmlspace = node.attributes['xml:space'];
+        const xmlspace = node.attributes["xml:space"];
 
         if (xmlspace) {
 
@@ -240,7 +240,7 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
 
             if (xmlspacestack.length === 0) {
 
-                xmlspacestack.unshift('default');
+                xmlspacestack.unshift("default");
 
             } else {
 
@@ -252,7 +252,7 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
 
         /* maintain the xml:lang stack */
 
-        const xmllang = node.attributes['xml:lang'];
+        const xmllang = node.attributes["xml:lang"];
 
         if (xmllang) {
 
@@ -262,7 +262,7 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
 
             if (xmllangstack.length === 0) {
 
-                xmllangstack.unshift('');
+                xmllangstack.unshift("");
 
             } else {
 
@@ -276,11 +276,11 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
 
         if (node.uri === ns_tt) {
 
-            if (node.local === 'tt') {
+            if (node.local === "tt") {
 
                 if (doc !== null) {
 
-                    reportFatal(errorHandler, 'Two <tt> elements at (' + this.line + ',' + this.column + ')');
+                    reportFatal(errorHandler, "Two <tt> elements at (" + this.line + "," + this.column + ")");
 
                 }
 
@@ -290,23 +290,23 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
 
                 estack.unshift(doc);
 
-            } else if (node.local === 'head') {
+            } else if (node.local === "head") {
 
                 if (!(estack[0] instanceof TT)) {
-                    reportFatal(errorHandler, 'Parent of <head> element is not <tt> at (' + this.line + ',' + this.column + ')');
+                    reportFatal(errorHandler, "Parent of <head> element is not <tt> at (" + this.line + "," + this.column + ")");
                 }
 
                 estack.unshift(doc.head);
 
-            } else if (node.local === 'styling') {
+            } else if (node.local === "styling") {
 
                 if (!(estack[0] instanceof Head)) {
-                    reportFatal(errorHandler, 'Parent of <styling> element is not <head> at (' + this.line + ',' + this.column + ')');
+                    reportFatal(errorHandler, "Parent of <styling> element is not <head> at (" + this.line + "," + this.column + ")");
                 }
 
                 estack.unshift(doc.head.styling);
 
-            } else if (node.local === 'style') {
+            } else if (node.local === "style") {
 
                 let s;
 
@@ -320,7 +320,7 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
 
                     if (!s.id) {
 
-                        reportError(errorHandler, '<style> element missing @id attribute');
+                        reportError(errorHandler, "<style> element missing @id attribute");
 
                     } else {
 
@@ -347,11 +347,11 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
 
                 } else {
 
-                    reportFatal(errorHandler, 'Parent of <style> element is not <styling> or <region> at (' + this.line + ',' + this.column + ')');
+                    reportFatal(errorHandler, "Parent of <style> element is not <styling> or <region> at (" + this.line + "," + this.column + ")");
 
                 }
 
-            } else if (node.local === 'initial') {
+            } else if (node.local === "initial") {
 
                 let ini;
 
@@ -373,24 +373,24 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
 
                 } else {
 
-                    reportFatal(errorHandler, 'Parent of <initial> element is not <styling> at (' + this.line + ',' + this.column + ')');
+                    reportFatal(errorHandler, "Parent of <initial> element is not <styling> at (" + this.line + "," + this.column + ")");
 
                 }
 
-            } else if (node.local === 'layout') {
+            } else if (node.local === "layout") {
 
                 if (!(estack[0] instanceof Head)) {
 
-                    reportFatal(errorHandler, 'Parent of <layout> element is not <head> at ' + this.line + ',' + this.column + ')');
+                    reportFatal(errorHandler, "Parent of <layout> element is not <head> at " + this.line + "," + this.column + ")");
 
                 }
 
                 estack.unshift(doc.head.layout);
 
-            } else if (node.local === 'region') {
+            } else if (node.local === "region") {
 
                 if (!(estack[0] instanceof Layout)) {
-                    reportFatal(errorHandler, 'Parent of <region> element is not <layout> at ' + this.line + ',' + this.column + ')');
+                    reportFatal(errorHandler, "Parent of <region> element is not <layout> at " + this.line + "," + this.column + ")");
                 }
 
                 const r = new Region();
@@ -399,7 +399,7 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
 
                 if (!r.id || r.id in doc.head.layout.regions) {
 
-                    reportError(errorHandler, 'Ignoring <region> with duplicate or missing @id at ' + this.line + ',' + this.column + ')');
+                    reportError(errorHandler, "Ignoring <region> with duplicate or missing @id at " + this.line + "," + this.column + ")");
 
                 } else {
 
@@ -409,17 +409,17 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
 
                 estack.unshift(r);
 
-            } else if (node.local === 'body') {
+            } else if (node.local === "body") {
 
                 if (!(estack[0] instanceof TT)) {
 
-                    reportFatal(errorHandler, 'Parent of <body> element is not <tt> at ' + this.line + ',' + this.column + ')');
+                    reportFatal(errorHandler, "Parent of <body> element is not <tt> at " + this.line + "," + this.column + ")");
 
                 }
 
                 if (doc.body !== null) {
 
-                    reportFatal(errorHandler, 'Second <body> element at ' + this.line + ',' + this.column + ')');
+                    reportFatal(errorHandler, "Second <body> element at " + this.line + "," + this.column + ")");
 
                 }
 
@@ -431,11 +431,11 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
 
                 estack.unshift(b);
 
-            } else if (node.local === 'div') {
+            } else if (node.local === "div") {
 
                 if (!(estack[0] instanceof Div || estack[0] instanceof Body)) {
 
-                    reportFatal(errorHandler, 'Parent of <div> element is not <body> or <div> at ' + this.line + ',' + this.column + ')');
+                    reportFatal(errorHandler, "Parent of <div> element is not <body> or <div> at " + this.line + "," + this.column + ")");
 
                 }
 
@@ -456,11 +456,11 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
 
                 estack.unshift(d);
 
-            } else if (node.local === 'image') {
+            } else if (node.local === "image") {
 
                 if (!(estack[0] instanceof Div)) {
 
-                    reportFatal(errorHandler, 'Parent of <image> element is not <div> at ' + this.line + ',' + this.column + ')');
+                    reportFatal(errorHandler, "Parent of <image> element is not <div> at " + this.line + "," + this.column + ")");
 
                 }
 
@@ -472,11 +472,11 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
 
                 estack.unshift(img);
 
-            } else if (node.local === 'p') {
+            } else if (node.local === "p") {
 
                 if (!(estack[0] instanceof Div)) {
 
-                    reportFatal(errorHandler, 'Parent of <p> element is not <div> at ' + this.line + ',' + this.column + ')');
+                    reportFatal(errorHandler, "Parent of <p> element is not <div> at " + this.line + "," + this.column + ")");
 
                 }
 
@@ -488,11 +488,11 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
 
                 estack.unshift(p);
 
-            } else if (node.local === 'span') {
+            } else if (node.local === "span") {
 
                 if (!(estack[0] instanceof Span || estack[0] instanceof P)) {
 
-                    reportFatal(errorHandler, 'Parent of <span> element is not <span> or <p> at ' + this.line + ',' + this.column + ')');
+                    reportFatal(errorHandler, "Parent of <span> element is not <span> or <p> at " + this.line + "," + this.column + ")");
 
                 }
 
@@ -504,11 +504,11 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
 
                 estack.unshift(ns);
 
-            } else if (node.local === 'br') {
+            } else if (node.local === "br") {
 
                 if (!(estack[0] instanceof Span || estack[0] instanceof P)) {
 
-                    reportFatal(errorHandler, 'Parent of <br> element is not <span> or <p> at ' + this.line + ',' + this.column + ')');
+                    reportFatal(errorHandler, "Parent of <br> element is not <span> or <p> at " + this.line + "," + this.column + ")");
 
                 }
 
@@ -520,7 +520,7 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
 
                 estack.unshift(nb);
 
-            } else if (node.local === 'set') {
+            } else if (node.local === "set") {
 
                 if (!(estack[0] instanceof Span ||
                     estack[0] instanceof P ||
@@ -529,7 +529,7 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
                     estack[0] instanceof Region ||
                     estack[0] instanceof Br)) {
 
-                    reportFatal(errorHandler, 'Parent of <set> element is not a content element or a region at ' + this.line + ',' + this.column + ')');
+                    reportFatal(errorHandler, "Parent of <set> element is not a content element or a region at " + this.line + "," + this.column + ")");
 
                 }
 
@@ -561,7 +561,7 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
         if (estack[0] instanceof ForeignElement) {
 
             if (node.uri === ns_tt &&
-                node.local === 'metadata') {
+                node.local === "metadata") {
 
                 /* enter the metadata element */
 
@@ -570,7 +570,7 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
             } else if (
                 metadata_depth > 0 &&
                 metadataHandler &&
-                'onOpenTag' in metadataHandler
+                "onOpenTag" in metadataHandler
             ) {
 
                 /* start of child of metadata element */
@@ -578,7 +578,7 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
                 const attrs = [];
 
                 for (const a in node.attributes) {
-                    attrs[node.attributes[a].uri + ' ' + node.attributes[a].local] =
+                    attrs[node.attributes[a].uri + " " + node.attributes[a].local] =
                     {
                         uri: node.attributes[a].uri,
                         local: node.attributes[a].local,
@@ -655,15 +655,15 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
 
 function cleanRubyContainers(element) {
 
-    if (!('contents' in element)) return;
+    if (!("contents" in element)) return;
 
-    const rubyval = 'styleAttrs' in element ? element.styleAttrs[byName.ruby.qname] : null;
+    const rubyval = "styleAttrs" in element ? element.styleAttrs[byName.ruby.qname] : null;
 
-    const isrubycontainer = (element.kind === 'span' && (rubyval === 'container' || rubyval === 'textContainer' || rubyval === 'baseContainer'));
+    const isrubycontainer = (element.kind === "span" && (rubyval === "container" || rubyval === "textContainer" || rubyval === "baseContainer"));
 
     for (let i = element.contents.length - 1; i >= 0; i--) {
 
-        if (isrubycontainer && !('styleAttrs' in element.contents[i] && byName.ruby.qname in element.contents[i].styleAttrs)) {
+        if (isrubycontainer && !("styleAttrs" in element.contents[i] && byName.ruby.qname in element.contents[i].styleAttrs)) {
 
             /* prune undefined <span> in ruby containers */
 
@@ -683,7 +683,7 @@ function resolveTiming(doc, element, prev_sibling, parent) {
 
     /* are we in a seq container? */
 
-    const isinseq = parent && parent.timeContainer === 'seq';
+    const isinseq = parent && parent.timeContainer === "seq";
 
     /* determine implicit begin */
 
@@ -717,13 +717,13 @@ function resolveTiming(doc, element, prev_sibling, parent) {
 
     let s = null;
 
-    if ('sets' in element) {
+    if ("sets" in element) {
 
         for (let set_i = 0; set_i < element.sets.length; set_i++) {
 
             resolveTiming(doc, element.sets[set_i], s, element);
 
-            if (element.timeContainer === 'seq') {
+            if (element.timeContainer === "seq") {
 
                 implicit_end = element.sets[set_i].end;
 
@@ -739,7 +739,7 @@ function resolveTiming(doc, element, prev_sibling, parent) {
 
     }
 
-    if (!('contents' in element)) {
+    if (!("contents" in element)) {
 
         /* anonymous spans and regions and <set> and <br>s and spans with only children text nodes */
 
@@ -757,13 +757,13 @@ function resolveTiming(doc, element, prev_sibling, parent) {
 
         }
 
-    } else if ('contents' in element) {
+    } else if ("contents" in element) {
 
         for (let content_i = 0; content_i < element.contents.length; content_i++) {
 
             resolveTiming(doc, element.contents[content_i], s, element);
 
-            if (element.timeContainer === 'seq') {
+            if (element.timeContainer === "seq") {
 
                 implicit_end = element.contents[content_i].end;
 
@@ -827,8 +827,8 @@ class TT {
         const cr = extractCellResolution(node, errorHandler);
 
         this.cellLength = {
-            'h': new ComputedLength(0, 1 / cr.h),
-            'w': new ComputedLength(1 / cr.w, 0),
+            "h": new ComputedLength(0, 1 / cr.h),
+            "w": new ComputedLength(1 / cr.w, 0),
         };
 
         /* extract frame rate and tick rate */
@@ -845,11 +845,11 @@ class TT {
 
         /* check timebase */
 
-        const attr = findAttribute(node, ns_ttp, 'timeBase');
+        const attr = findAttribute(node, ns_ttp, "timeBase");
 
-        if (attr !== null && attr !== 'media') {
+        if (attr !== null && attr !== "media") {
 
-            reportFatal(errorHandler, 'Unsupported time base');
+            reportFatal(errorHandler, "Unsupported time base");
 
         }
 
@@ -860,19 +860,19 @@ class TT {
         if (e === null) {
 
             this.pxLength = {
-                'h': null,
-                'w': null,
+                "h": null,
+                "w": null,
             };
 
         } else {
 
-            if (e.h.unit !== 'px' || e.w.unit !== 'px') {
-                reportFatal(errorHandler, 'Extent on TT must be in px or absent');
+            if (e.h.unit !== "px" || e.w.unit !== "px") {
+                reportFatal(errorHandler, "Extent on TT must be in px or absent");
             }
 
             this.pxLength = {
-                'h': new ComputedLength(0, 1 / e.h.value),
-                'w': new ComputedLength(1 / e.w.value, 0),
+                "h": new ComputedLength(0, 1 / e.h.value),
+                "w": new ComputedLength(1 / e.w.value, 0),
             };
         }
 
@@ -881,8 +881,8 @@ class TT {
         **/
 
         this.dimensions = {
-            'h': new ComputedLength(0, 1),
-            'w': new ComputedLength(1, 0),
+            "h": new ComputedLength(0, 1),
+            "w": new ComputedLength(1, 0),
 
         };
 
@@ -1003,7 +1003,7 @@ class Initial {
                 node.attributes[i].uri === ns_ebutts ||
                 node.attributes[i].uri === ns_tts) {
 
-                const qname = node.attributes[i].uri + ' ' + node.attributes[i].local;
+                const qname = node.attributes[i].uri + " " + node.attributes[i].local;
 
                 this.styleAttrs[qname] = node.attributes[i].value;
 
@@ -1036,22 +1036,22 @@ class ContentElement {
 
 class Image extends ContentElement {
     constructor(src, type) {
-        super('image');
+        super("image");
         this.src = src;
         this.type = type;
     }
 
     initFromNode(doc, parent, node, xmllang, errorHandler) {
-        this.src = 'src' in node.attributes ? node.attributes.src.value : null;
+        this.src = "src" in node.attributes ? node.attributes.src.value : null;
 
         if (!this.src) {
-            reportError(errorHandler, 'Invalid image@src attribute');
+            reportError(errorHandler, "Invalid image@src attribute");
         }
 
-        this.type = 'type' in node.attributes ? node.attributes.type.value : null;
+        this.type = "type" in node.attributes ? node.attributes.type.value : null;
 
         if (!this.type) {
-            reportError(errorHandler, 'Invalid image@type attribute');
+            reportError(errorHandler, "Invalid image@type attribute");
         }
 
         StyledElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
@@ -1147,7 +1147,7 @@ class TimedElement {
 
 class Body extends ContentElement {
     constructor() {
-        super('body');
+        super("body");
     }
 
     initFromNode(doc, node, xmllang, errorHandler) {
@@ -1167,7 +1167,7 @@ class Body extends ContentElement {
 
 class Div extends ContentElement {
     constructor() {
-        super('div');
+        super("div");
     }
 
     initFromNode(doc, parent, node, xmllang, errorHandler) {
@@ -1187,7 +1187,7 @@ class Div extends ContentElement {
 
 class P extends ContentElement {
     constructor() {
-        super('p');
+        super("p");
     }
 
     initFromNode(doc, parent, node, xmllang, errorHandler) {
@@ -1207,7 +1207,7 @@ class P extends ContentElement {
 
 class Span extends ContentElement {
     constructor() {
-        super('span');
+        super("span");
     }
 
     initFromNode(doc, parent, node, xmllang, xmlspace, errorHandler) {
@@ -1228,7 +1228,7 @@ class Span extends ContentElement {
 
 class AnonymousSpan extends ContentElement {
     constructor() {
-        super('span');
+        super("span");
     }
 
     initFromText(doc, parent, text, xmllang, xmlspace, errorHandler) {
@@ -1246,7 +1246,7 @@ class AnonymousSpan extends ContentElement {
 
 class Br extends ContentElement {
     constructor() {
-        super('br');
+        super("br");
     }
 
     initFromNode(doc, parent, node, xmllang, errorHandler) {
@@ -1268,7 +1268,7 @@ class Region {
     createDefaultRegion(xmllang) {
         const r = new Region();
 
-        r.id = '';
+        r.id = "";
         r.styleAttrs = {};
         r.sets = [];
         r.explicit_begin = 0;
@@ -1323,7 +1323,7 @@ class Set {
 
             if (this.qname) {
 
-                reportError(errorHandler, 'More than one style specified on set');
+                reportError(errorHandler, "More than one style specified on set");
                 break;
 
             }
@@ -1342,30 +1342,30 @@ class Set {
  */
 
 function elementGetXMLID(node) {
-    return node && 'xml:id' in node.attributes ? node.attributes['xml:id'].value || null : null;
+    return node && "xml:id" in node.attributes ? node.attributes["xml:id"].value || null : null;
 }
 
 function elementGetRegionID(node) {
-    return node && 'region' in node.attributes ? node.attributes.region.value : '';
+    return node && "region" in node.attributes ? node.attributes.region.value : "";
 }
 
 function elementGetTimeContainer(node, errorHandler) {
 
-    const tc = node && 'timeContainer' in node.attributes ? node.attributes.timeContainer.value : null;
+    const tc = node && "timeContainer" in node.attributes ? node.attributes.timeContainer.value : null;
 
-    if ((!tc) || tc === 'par') {
+    if ((!tc) || tc === "par") {
 
-        return 'par';
+        return "par";
 
-    } else if (tc === 'seq') {
+    } else if (tc === "seq") {
 
-        return 'seq';
+        return "seq";
 
     } else {
 
         reportError(errorHandler, "Illegal value of timeContainer (assuming 'par')");
 
-        return 'par';
+        return "par";
 
     }
 
@@ -1373,7 +1373,7 @@ function elementGetTimeContainer(node, errorHandler) {
 
 function elementGetStyleRefs(node) {
 
-    return node && 'style' in node.attributes ? node.attributes.style.value.split(' ') : [];
+    return node && "style" in node.attributes ? node.attributes.style.value.split(" ") : [];
 
 }
 
@@ -1385,7 +1385,7 @@ function elementGetStyles(node, errorHandler) {
 
         for (const i in node.attributes) {
 
-            const qname = node.attributes[i].uri + ' ' + node.attributes[i].local;
+            const qname = node.attributes[i].uri + " " + node.attributes[i].local;
 
             const sa = byQName[qname];
 
@@ -1400,12 +1400,12 @@ function elementGetStyles(node, errorHandler) {
                     /* TODO: consider refactoring errorHandler into parse and compute routines */
 
                     if (sa === byName.zIndex) {
-                        reportWarning(errorHandler, 'zIndex attribute present but not used by IMSC1 since regions do not overlap');
+                        reportWarning(errorHandler, "zIndex attribute present but not used by IMSC1 since regions do not overlap");
                     }
 
                 } else {
 
-                    reportError(errorHandler, 'Cannot parse styling attribute ' + qname + ' --> ' + node.attributes[i].value);
+                    reportError(errorHandler, "Cannot parse styling attribute " + qname + " --> " + node.attributes[i].value);
 
                 }
 
@@ -1433,11 +1433,11 @@ function findAttribute(node, ns, name) {
 
 function extractAspectRatio(node, errorHandler) {
 
-    let ar = findAttribute(node, ns_ittp, 'aspectRatio');
+    let ar = findAttribute(node, ns_ittp, "aspectRatio");
 
     if (ar === null) {
 
-        ar = findAttribute(node, ns_ttp, 'displayAspectRatio');
+        ar = findAttribute(node, ns_ttp, "displayAspectRatio");
 
     }
 
@@ -1461,12 +1461,12 @@ function extractAspectRatio(node, errorHandler) {
 
             } else {
 
-                reportError(errorHandler, 'Illegal aspectRatio values (ignoring)');
+                reportError(errorHandler, "Illegal aspectRatio values (ignoring)");
             }
 
         } else {
 
-            reportError(errorHandler, 'Malformed aspectRatio attribute (ignoring)');
+            reportError(errorHandler, "Malformed aspectRatio attribute (ignoring)");
         }
 
     }
@@ -1481,7 +1481,7 @@ function extractAspectRatio(node, errorHandler) {
  */
 function extractCellResolution(node, errorHandler) {
 
-    const cr = findAttribute(node, ns_ttp, 'cellResolution');
+    const cr = findAttribute(node, ns_ttp, "cellResolution");
 
     // initial value
 
@@ -1502,13 +1502,13 @@ function extractCellResolution(node, errorHandler) {
 
         } else {
 
-            reportWarning(errorHandler, 'Malformed cellResolution value (using initial value instead)');
+            reportWarning(errorHandler, "Malformed cellResolution value (using initial value instead)");
 
         }
 
     }
 
-    return { 'w': w, 'h': h };
+    return { "w": w, "h": h };
 
 }
 
@@ -1518,7 +1518,7 @@ function extractFrameAndTickRate(node, errorHandler) {
 
     // extract frame rate
 
-    const fps_attr = findAttribute(node, ns_ttp, 'frameRate');
+    const fps_attr = findAttribute(node, ns_ttp, "frameRate");
 
     // initial value
 
@@ -1540,14 +1540,14 @@ function extractFrameAndTickRate(node, errorHandler) {
 
         } else {
 
-            reportWarning(errorHandler, 'Malformed frame rate attribute (using initial value instead)');
+            reportWarning(errorHandler, "Malformed frame rate attribute (using initial value instead)");
         }
 
     }
 
     // extract frame rate multiplier
 
-    const frm_attr = findAttribute(node, ns_ttp, 'frameRateMultiplier');
+    const frm_attr = findAttribute(node, ns_ttp, "frameRateMultiplier");
 
     // initial value
 
@@ -1565,7 +1565,7 @@ function extractFrameAndTickRate(node, errorHandler) {
 
         } else {
 
-            reportWarning(errorHandler, 'Malformed frame rate multiplier attribute (using initial value instead)');
+            reportWarning(errorHandler, "Malformed frame rate multiplier attribute (using initial value instead)");
         }
 
     }
@@ -1576,7 +1576,7 @@ function extractFrameAndTickRate(node, errorHandler) {
 
     let tr = 1;
 
-    const trattr = findAttribute(node, ns_ttp, 'tickRate');
+    const trattr = findAttribute(node, ns_ttp, "tickRate");
 
     if (trattr === null) {
 
@@ -1595,7 +1595,7 @@ function extractFrameAndTickRate(node, errorHandler) {
 
         } else {
 
-            reportWarning(errorHandler, 'Malformed tick rate attribute (using initial value instead)');
+            reportWarning(errorHandler, "Malformed tick rate attribute (using initial value instead)");
         }
 
     }
@@ -1606,16 +1606,16 @@ function extractFrameAndTickRate(node, errorHandler) {
 
 function extractExtent(node, errorHandler) {
 
-    const attr = findAttribute(node, ns_tts, 'extent');
+    const attr = findAttribute(node, ns_tts, "extent");
 
     if (attr === null)
         return null;
 
-    const s = attr.split(' ');
+    const s = attr.split(" ");
 
     if (s.length !== 2) {
 
-        reportWarning(errorHandler, 'Malformed extent (ignoring)');
+        reportWarning(errorHandler, "Malformed extent (ignoring)");
 
         return null;
     }
@@ -1626,12 +1626,12 @@ function extractExtent(node, errorHandler) {
 
     if (!h || !w) {
 
-        reportWarning(errorHandler, 'Malformed extent values (ignoring)');
+        reportWarning(errorHandler, "Malformed extent values (ignoring)");
 
         return null;
     }
 
-    return { 'h': h, 'w': w };
+    return { "h": h, "w": w };
 
 }
 
@@ -1706,13 +1706,13 @@ function processTiming(doc, parent, node, errorHandler) {
 
     let explicit_begin = null;
 
-    if (node && 'begin' in node.attributes) {
+    if (node && "begin" in node.attributes) {
 
         explicit_begin = parseTimeExpression(doc.tickRate, doc.effectiveFrameRate, node.attributes.begin.value);
 
         if (explicit_begin === null) {
 
-            reportWarning(errorHandler, 'Malformed begin value ' + node.attributes.begin.value + ' (using 0)');
+            reportWarning(errorHandler, "Malformed begin value " + node.attributes.begin.value + " (using 0)");
 
         }
 
@@ -1722,13 +1722,13 @@ function processTiming(doc, parent, node, errorHandler) {
 
     let explicit_dur = null;
 
-    if (node && 'dur' in node.attributes) {
+    if (node && "dur" in node.attributes) {
 
         explicit_dur = parseTimeExpression(doc.tickRate, doc.effectiveFrameRate, node.attributes.dur.value);
 
         if (explicit_dur === null) {
 
-            reportWarning(errorHandler, 'Malformed dur value ' + node.attributes.dur.value + ' (ignoring)');
+            reportWarning(errorHandler, "Malformed dur value " + node.attributes.dur.value + " (ignoring)");
 
         }
 
@@ -1738,13 +1738,13 @@ function processTiming(doc, parent, node, errorHandler) {
 
     let explicit_end = null;
 
-    if (node && 'end' in node.attributes) {
+    if (node && "end" in node.attributes) {
 
         explicit_end = parseTimeExpression(doc.tickRate, doc.effectiveFrameRate, node.attributes.end.value);
 
         if (explicit_end === null) {
 
-            reportWarning(errorHandler, 'Malformed end value (ignoring)');
+            reportWarning(errorHandler, "Malformed end value (ignoring)");
 
         }
 
@@ -1765,7 +1765,7 @@ function mergeChainedStyles(styling, style, errorHandler) {
         const sref = style.styleRefs.pop();
 
         if (!(sref in styling.styles)) {
-            reportError(errorHandler, 'Non-existant style id referenced');
+            reportError(errorHandler, "Non-existant style id referenced");
             continue;
         }
 
@@ -1784,7 +1784,7 @@ function mergeReferencedStyles(styling, stylerefs, styleattrs, errorHandler) {
         const sref = stylerefs[i];
 
         if (!(sref in styling.styles)) {
-            reportError(errorHandler, 'Non-existant style id referenced');
+            reportError(errorHandler, "Non-existant style id referenced");
             continue;
         }
 
diff --git a/src/main/js/html.js b/src/main/js/html.js
index 5e57ea36..bd0a557a 100755
--- a/src/main/js/html.js
+++ b/src/main/js/html.js
@@ -24,8 +24,8 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-import { reportError } from './error.js';
-import { byName } from './styles.js';
+import { reportError } from "./error.js";
+import { byName } from "./styles.js";
 
 /**
  * @module imscHTML
@@ -103,12 +103,12 @@ export function renderHTML(isd,
 
     }
 
-    const rootcontainer = document.createElement('div');
+    const rootcontainer = document.createElement("div");
 
-    rootcontainer.style.position = 'relative';
-    rootcontainer.style.width = width + 'px';
-    rootcontainer.style.height = height + 'px';
-    rootcontainer.style.margin = 'auto';
+    rootcontainer.style.position = "relative";
+    rootcontainer.style.width = width + "px";
+    rootcontainer.style.height = height + "px";
+    rootcontainer.style.margin = "auto";
     rootcontainer.style.top = 0;
     rootcontainer.style.bottom = 0;
     rootcontainer.style.left = 0;
@@ -139,7 +139,7 @@ export function renderHTML(isd,
 
     element.appendChild(rootcontainer);
 
-    if ('contents' in isd) {
+    if ("contents" in isd) {
 
         for (let i = 0; i < isd.contents.length; i++) {
 
@@ -157,22 +157,22 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
 
     let e;
 
-    if (isd_element.kind === 'region') {
+    if (isd_element.kind === "region") {
 
-        e = document.createElement('div');
-        e.style.position = 'absolute';
+        e = document.createElement("div");
+        e.style.position = "absolute";
 
-    } else if (isd_element.kind === 'body') {
+    } else if (isd_element.kind === "body") {
 
-        e = document.createElement('div');
+        e = document.createElement("div");
 
-    } else if (isd_element.kind === 'div') {
+    } else if (isd_element.kind === "div") {
 
-        e = document.createElement('div');
+        e = document.createElement("div");
 
-    } else if (isd_element.kind === 'image') {
+    } else if (isd_element.kind === "image") {
 
-        e = document.createElement('img');
+        e = document.createElement("img");
 
         if (context.imgResolver !== null && isd_element.src !== null) {
 
@@ -186,35 +186,35 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
 
         }
 
-    } else if (isd_element.kind === 'p') {
+    } else if (isd_element.kind === "p") {
 
-        e = document.createElement('p');
+        e = document.createElement("p");
 
-    } else if (isd_element.kind === 'span') {
+    } else if (isd_element.kind === "span") {
 
-        if (isd_element.styleAttrs[byName.ruby.qname] === 'container') {
+        if (isd_element.styleAttrs[byName.ruby.qname] === "container") {
 
-            e = document.createElement('ruby');
+            e = document.createElement("ruby");
 
             context.ruby = true;
 
-        } else if (isd_element.styleAttrs[byName.ruby.qname] === 'base') {
+        } else if (isd_element.styleAttrs[byName.ruby.qname] === "base") {
 
-            e = document.createElement('span'); // rb element is deprecated in HTML
+            e = document.createElement("span"); // rb element is deprecated in HTML
 
-        } else if (isd_element.styleAttrs[byName.ruby.qname] === 'text') {
+        } else if (isd_element.styleAttrs[byName.ruby.qname] === "text") {
 
-            e = document.createElement('rt');
+            e = document.createElement("rt");
 
-        } else if (isd_element.styleAttrs[byName.ruby.qname] === 'baseContainer') {
+        } else if (isd_element.styleAttrs[byName.ruby.qname] === "baseContainer") {
 
-            e = document.createElement('rbc');
+            e = document.createElement("rbc");
 
-        } else if (isd_element.styleAttrs[byName.ruby.qname] === 'textContainer') {
+        } else if (isd_element.styleAttrs[byName.ruby.qname] === "textContainer") {
 
-            e = document.createElement('rtc');
+            e = document.createElement("rtc");
 
-        } else if (isd_element.styleAttrs[byName.ruby.qname] === 'delimiter') {
+        } else if (isd_element.styleAttrs[byName.ruby.qname] === "delimiter") {
 
             /* ignore rp */
 
@@ -222,21 +222,21 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
 
         } else {
 
-            e = document.createElement('span');
+            e = document.createElement("span");
 
         }
 
         //e.textContent = isd_element.text;
 
-    } else if (isd_element.kind === 'br') {
+    } else if (isd_element.kind === "br") {
 
-        e = document.createElement('br');
+        e = document.createElement("br");
 
     }
 
     if (!e) {
 
-        reportError(context.errorHandler, 'Error processing ISD element kind: ' + isd_element.kind);
+        reportError(context.errorHandler, "Error processing ISD element kind: " + isd_element.kind);
 
         return;
 
@@ -246,7 +246,7 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
 
     if (isd_element.lang) {
 
-        if (isd_element.kind === 'region' || isd_element.lang !== isd_parent.lang) {
+        if (isd_element.kind === "region" || isd_element.lang !== isd_parent.lang) {
             e.lang = isd_element.lang;
         }
 
@@ -259,41 +259,41 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
     /* override UA default margin */
     /* TODO: should apply to <p> only */
 
-    e.style.margin = '0';
+    e.style.margin = "0";
 
     /* determine ipd and bpd */
 
-    if (isd_element.kind === 'region') {
+    if (isd_element.kind === "region") {
 
         const wdir = isd_element.styleAttrs[byName.writingMode.qname];
 
-        if (wdir === 'lrtb' || wdir === 'lr') {
+        if (wdir === "lrtb" || wdir === "lr") {
 
-            context.ipd = 'lr';
-            context.bpd = 'tb';
+            context.ipd = "lr";
+            context.bpd = "tb";
 
-        } else if (wdir === 'rltb' || wdir === 'rl') {
+        } else if (wdir === "rltb" || wdir === "rl") {
 
-            context.ipd = 'rl';
-            context.bpd = 'tb';
+            context.ipd = "rl";
+            context.bpd = "tb";
 
-        } else if (wdir === 'tblr') {
+        } else if (wdir === "tblr") {
 
-            context.ipd = 'tb';
-            context.bpd = 'lr';
+            context.ipd = "tb";
+            context.bpd = "lr";
 
-        } else if (wdir === 'tbrl' || wdir === 'tb') {
+        } else if (wdir === "tbrl" || wdir === "tb") {
 
-            context.ipd = 'tb';
-            context.bpd = 'rl';
+            context.ipd = "tb";
+            context.bpd = "rl";
 
         }
 
-    } else if (isd_element.kind === 'p' && context.bpd === 'tb') {
+    } else if (isd_element.kind === "p" && context.bpd === "tb") {
 
         const pdir = isd_element.styleAttrs[byName.direction.qname];
 
-        context.ipd = pdir === 'ltr' ? 'lr' : 'rl';
+        context.ipd = pdir === "ltr" ? "lr" : "rl";
 
     }
 
@@ -327,9 +327,9 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
 
             /* apply padding to the <p> so that line padding does not cause line wraps */
 
-            const padmeasure = Math.ceil(plength) + 'px';
+            const padmeasure = Math.ceil(plength) + "px";
 
-            if (context.bpd === 'tb') {
+            if (context.bpd === "tb") {
 
                 proc_e.style.paddingLeft = padmeasure;
                 proc_e.style.paddingRight = padmeasure;
@@ -349,13 +349,13 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
 
     const mra = isd_element.styleAttrs[byName.multiRowAlign.qname];
 
-    if (mra && mra !== 'auto') {
+    if (mra && mra !== "auto") {
 
         /* create inline block to handle multirowAlign */
 
-        const s = document.createElement('span');
+        const s = document.createElement("span");
 
-        s.style.display = 'inline-block';
+        s.style.display = "inline-block";
 
         s.style.textAlign = mra;
 
@@ -371,7 +371,7 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
 
     const rr = isd_element.styleAttrs[byName.rubyReserve.qname];
 
-    if (rr && rr[0] !== 'none') {
+    if (rr && rr[0] !== "none") {
         context.rubyReserve = rr;
     }
 
@@ -381,18 +381,18 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
         context.flg = true;
     }
 
-    if (isd_element.kind === 'span' && isd_element.text) {
+    if (isd_element.kind === "span" && isd_element.text) {
 
         const te = isd_element.styleAttrs[byName.textEmphasis.qname];
 
-        if (te && te.style !== 'none') {
+        if (te && te.style !== "none") {
 
             context.textEmphasis = true;
 
         }
 
         if (byName.textCombine.qname in isd_element.styleAttrs &&
-            isd_element.styleAttrs[byName.textCombine.qname] === 'all') {
+            isd_element.styleAttrs[byName.textCombine.qname] === "all") {
 
             /* ignore tate-chu-yoku since line break cannot happen within */
             e.textContent = isd_element.text;
@@ -408,7 +408,7 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
 
             // wrap characters in spans to find the line wrap locations
 
-            let cbuf = '';
+            let cbuf = "";
 
             for (let j = 0; j < isd_element.text.length; j++) {
 
@@ -420,7 +420,7 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
 
                     /* wrap the character(s) in a span unless it is a high surrogate */
 
-                    const span = document.createElement('span');
+                    const span = document.createElement("span");
 
                     span.textContent = cbuf;
 
@@ -434,7 +434,7 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
 
                     e.appendChild(span);
 
-                    cbuf = '';
+                    cbuf = "";
 
                     //For the sake of merging these back together, record what isd element generated it.
                     span._isd_element = isd_element;
@@ -447,7 +447,7 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
 
     /* process the children of the ISD element */
 
-    if ('contents' in isd_element) {
+    if ("contents" in isd_element) {
 
         for (let k = 0; k < isd_element.contents.length; k++) {
 
@@ -464,7 +464,7 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
     /* paragraph processing */
     /* TODO: linePadding only supported for horizontal scripts */
 
-    if (isd_element.kind === 'p') {
+    if (isd_element.kind === "p") {
 
         constructLineList(context, proc_e, linelist, null);
 
@@ -536,20 +536,20 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
 
     /* region processing */
 
-    if (isd_element.kind === 'region') {
+    if (isd_element.kind === "region") {
 
         /* perform roll up if needed */
-        if ((context.bpd === 'tb') &&
+        if ((context.bpd === "tb") &&
             context.enableRollUp &&
             isd_element.contents.length > 0 &&
-            isd_element.styleAttrs[byName.displayAlign.qname] === 'after') {
+            isd_element.styleAttrs[byName.displayAlign.qname] === "after") {
 
             /* build line list */
             constructLineList(context, proc_e, linelist, null);
 
             /* horrible hack, perhaps default region id should be underscore everywhere? */
 
-            const rid = isd_element.id === '' ? '_' : isd_element.id;
+            const rid = isd_element.id === "" ? "_" : isd_element.id;
 
             const rb = new RegionPBuffer(rid, linelist);
 
@@ -566,10 +566,10 @@ function processElement(context, dom_parent, isd_element, isd_parent) {
 
                 const h = rb.plist[rb.plist.length - 1].after - rb.plist[rb.plist.length - 1].before;
 
-                body_elem.style.bottom = '-' + h + 'px';
-                body_elem.style.transition = 'transform 0.4s';
-                body_elem.style.position = 'relative';
-                body_elem.style.transform = 'translateY(-' + h + 'px)';
+                body_elem.style.bottom = "-" + h + "px";
+                body_elem.style.transition = "transform 0.4s";
+                body_elem.style.position = "relative";
+                body_elem.style.transform = "translateY(-" + h + "px)";
 
             }
 
@@ -624,7 +624,7 @@ function mergeSpans(lineList, context) {
 
     for (let bi = 0; bi < clearTheseBackgrounds.length; bi++) {
 
-        clearTheseBackgrounds[bi].style.backgroundColor = '';
+        clearTheseBackgrounds[bi].style.backgroundColor = "";
 
     }
 }
@@ -642,11 +642,11 @@ function getSpanAncestorColor(element, ancestorList, isAncestor) {
 
     } else {
 
-        if (element.parentElement.nodeName === 'SPAN' ||
-            element.parentElement.nodeName === 'RUBY' ||
-            element.parentElement.nodeName === 'RBC' ||
-            element.parentElement.nodeName === 'RTC' ||
-            element.parentElement.nodeName === 'RT') {
+        if (element.parentElement.nodeName === "SPAN" ||
+            element.parentElement.nodeName === "RUBY" ||
+            element.parentElement.nodeName === "RBC" ||
+            element.parentElement.nodeName === "RTC" ||
+            element.parentElement.nodeName === "RT") {
 
             return getSpanAncestorColor(element.parentElement, ancestorList, true);
 
@@ -659,12 +659,12 @@ function getSpanAncestorColor(element, ancestorList, isAncestor) {
 
 function spanMerge(first, second, context) {
 
-    if (first.tagName === 'SPAN' &&
-        second.tagName === 'SPAN' &&
+    if (first.tagName === "SPAN" &&
+        second.tagName === "SPAN" &&
         first._isd_element === second._isd_element) {
         if (!first._isd_element) {
             /* we should never get here since every span should have a source ISD element */
-            reportError(context.errorHandler, 'Internal error: HTML span is not linked to a source element; cannot merge spans.');
+            reportError(context.errorHandler, "Internal error: HTML span is not linked to a source element; cannot merge spans.");
             return false;
         }
 
@@ -673,9 +673,9 @@ function spanMerge(first, second, context) {
         for (let i = 0; i < second.style.length; i++) {
 
             const styleName = second.style[i];
-            if (styleName.indexOf('border') >= 0 ||
-                styleName.indexOf('padding') >= 0 ||
-                styleName.indexOf('margin') >= 0) {
+            if (styleName.indexOf("border") >= 0 ||
+                styleName.indexOf("padding") >= 0 ||
+                styleName.indexOf("margin") >= 0) {
 
                 first.style[styleName] = second.style[styleName];
 
@@ -698,9 +698,9 @@ function applyLinePadding(lineList, lp, context) {
 
         const l = lineList[i].elements.length;
 
-        const pospadpxlen = Math.ceil(lp) + 'px';
+        const pospadpxlen = Math.ceil(lp) + "px";
 
-        const negpadpxlen = '-' + Math.ceil(lp) + 'px';
+        const negpadpxlen = "-" + Math.ceil(lp) + "px";
 
         if (l !== 0) {
 
@@ -723,17 +723,17 @@ function applyLinePadding(lineList, lp, context) {
             }
 
             // Start element
-            if (context.ipd === 'lr') {
+            if (context.ipd === "lr") {
 
                 se.node.style.marginLeft = negpadpxlen;
                 se.node.style.paddingLeft = pospadpxlen;
 
-            } else if (context.ipd === 'rl') {
+            } else if (context.ipd === "rl") {
 
                 se.node.style.paddingRight = pospadpxlen;
                 se.node.style.marginRight = negpadpxlen;
 
-            } else if (context.ipd === 'tb') {
+            } else if (context.ipd === "tb") {
 
                 se.node.style.paddingTop = pospadpxlen;
                 se.node.style.marginTop = negpadpxlen;
@@ -741,7 +741,7 @@ function applyLinePadding(lineList, lp, context) {
             }
 
             // End element
-            if (context.ipd === 'lr') {
+            if (context.ipd === "lr") {
 
                 // Firefox has a problem with line-breaking when a negative margin is applied.
                 // The positioning will be wrong but don't apply when on firefox.
@@ -751,14 +751,14 @@ function applyLinePadding(lineList, lp, context) {
                 }
                 ee.node.style.paddingRight = pospadpxlen;
 
-            } else if (context.ipd === 'rl') {
+            } else if (context.ipd === "rl") {
 
                 ee.node.style.paddingLeft = pospadpxlen;
                 if (!browserIsFirefox) {
                     ee.node.style.marginLeft = negpadpxlen;
                 }
 
-            } else if (context.ipd === 'tb') {
+            } else if (context.ipd === "tb") {
 
                 ee.node.style.paddingBottom = pospadpxlen;
                 ee.node.style.marginBottom = negpadpxlen;
@@ -780,7 +780,7 @@ function applyMultiRowAlign(lineList) {
         const l = lineList[i].elements.length;
 
         if (l !== 0 && lineList[i].br === false) {
-            const br = document.createElement('br');
+            const br = document.createElement("br");
 
             const lastnode = lineList[i].elements[l - 1].node;
 
@@ -802,24 +802,24 @@ function applyTextEmphasisOutside(lineList, context) {
             /* skip if position already set */
 
             if (lineList[i].te[j].style[TEXTEMPHASISPOSITION_PROP] &&
-                lineList[i].te[j].style[TEXTEMPHASISPOSITION_PROP] !== 'none')
+                lineList[i].te[j].style[TEXTEMPHASISPOSITION_PROP] !== "none")
                 continue;
 
             let pos;
 
-            if (context.bpd === 'tb') {
+            if (context.bpd === "tb") {
 
-                pos = (i === 0) ? 'left over' : 'left under';
+                pos = (i === 0) ? "left over" : "left under";
 
             } else {
 
-                if (context.bpd === 'rl') {
+                if (context.bpd === "rl") {
 
-                    pos = (i === 0) ? 'right under' : 'left under';
+                    pos = (i === 0) ? "right under" : "left under";
 
                 } else {
 
-                    pos = (i === 0) ? 'left under' : 'right under';
+                    pos = (i === 0) ? "left under" : "right under";
 
                 }
 
@@ -850,21 +850,21 @@ function applyRubyPosition(lineList, context) {
 
                 /* WebKit exception */
 
-                pos = (i === 0) ? 'before' : 'after';
+                pos = (i === 0) ? "before" : "after";
 
-            } else if (context.bpd === 'tb') {
+            } else if (context.bpd === "tb") {
 
-                pos = (i === 0) ? 'over' : 'under';
+                pos = (i === 0) ? "over" : "under";
 
             } else {
 
-                if (context.bpd === 'rl') {
+                if (context.bpd === "rl") {
 
-                    pos = (i === 0) ? 'over' : 'under';
+                    pos = (i === 0) ? "over" : "under";
 
                 } else {
 
-                    pos = (i === 0) ? 'under' : 'over';
+                    pos = (i === 0) ? "under" : "over";
 
                 }
 
@@ -882,28 +882,28 @@ function applyRubyReserve(lineList, context) {
 
     for (let i = 0; i < lineList.length; i++) {
 
-        const ruby = document.createElement('ruby');
+        const ruby = document.createElement("ruby");
 
-        const rb = document.createElement('span');  // rb element is deprecated in HTML
-        rb.textContent = '\u200B';
+        const rb = document.createElement("span");  // rb element is deprecated in HTML
+        rb.textContent = "\u200B";
 
         ruby.appendChild(rb);
 
         let rt1;
         let rt2;
 
-        const fs = context.rubyReserve[1].toUsedLength(context.w, context.h) + 'px';
+        const fs = context.rubyReserve[1].toUsedLength(context.w, context.h) + "px";
 
-        if (context.rubyReserve[0] === 'both' || (context.rubyReserve[0] === 'outside' && lineList.length == 1)) {
+        if (context.rubyReserve[0] === "both" || (context.rubyReserve[0] === "outside" && lineList.length == 1)) {
 
-            rt1 = document.createElement('rtc');
-            rt1.style[RUBYPOSITION_PROP] = RUBYPOSITION_ISWK ? 'after' : 'under';
-            rt1.textContent = '\u200B';
+            rt1 = document.createElement("rtc");
+            rt1.style[RUBYPOSITION_PROP] = RUBYPOSITION_ISWK ? "after" : "under";
+            rt1.textContent = "\u200B";
             rt1.style.fontSize = fs;
 
-            rt2 = document.createElement('rtc');
-            rt2.style[RUBYPOSITION_PROP] = RUBYPOSITION_ISWK ? 'before' : 'over';
-            rt2.textContent = '\u200B';
+            rt2 = document.createElement("rtc");
+            rt2.style[RUBYPOSITION_PROP] = RUBYPOSITION_ISWK ? "before" : "over";
+            rt2.textContent = "\u200B";
             rt2.style.fontSize = fs;
 
             ruby.appendChild(rt1);
@@ -911,19 +911,19 @@ function applyRubyReserve(lineList, context) {
 
         } else {
 
-            rt1 = document.createElement('rtc');
-            rt1.textContent = '\u200B';
+            rt1 = document.createElement("rtc");
+            rt1.textContent = "\u200B";
             rt1.style.fontSize = fs;
 
             let pos;
 
-            if (context.rubyReserve[0] === 'after' || (context.rubyReserve[0] === 'outside' && i > 0)) {
+            if (context.rubyReserve[0] === "after" || (context.rubyReserve[0] === "outside" && i > 0)) {
 
-                pos = RUBYPOSITION_ISWK ? 'after' : ((context.bpd === 'tb' || context.bpd === 'rl') ? 'under' : 'over');
+                pos = RUBYPOSITION_ISWK ? "after" : ((context.bpd === "tb" || context.bpd === "rl") ? "under" : "over");
 
             } else {
 
-                pos = RUBYPOSITION_ISWK ? 'before' : ((context.bpd === 'tb' || context.bpd === 'rl') ? 'over' : 'under');
+                pos = RUBYPOSITION_ISWK ? "before" : ((context.bpd === "tb" || context.bpd === "rl") ? "over" : "under");
 
             }
 
@@ -939,7 +939,7 @@ function applyRubyReserve(lineList, context) {
 
         for (let j = 0; j < lineList[i].rbc.length; j++) {
 
-            if (lineList[i].rbc[j].localName === 'ruby') {
+            if (lineList[i].rbc[j].localName === "ruby") {
 
                 sib = lineList[i].rbc[j];
 
@@ -1003,17 +1003,17 @@ function applyFillLineGap(lineList, par_before, par_after, context) {
                 for (l = 0; l < lineList[i - 1].elements.length; l++) {
 
                     thisNode = lineList[i - 1].elements[l];
-                    padding = s * (frontier - thisNode.after) + 'px';
+                    padding = s * (frontier - thisNode.after) + "px";
 
-                    if (context.bpd === 'lr') {
+                    if (context.bpd === "lr") {
 
                         thisNode.node.style.paddingRight = padding;
 
-                    } else if (context.bpd === 'rl') {
+                    } else if (context.bpd === "rl") {
 
                         thisNode.node.style.paddingLeft = padding;
 
-                    } else if (context.bpd === 'tb') {
+                    } else if (context.bpd === "tb") {
 
                         thisNode.node.style.paddingBottom = padding;
 
@@ -1031,17 +1031,17 @@ function applyFillLineGap(lineList, par_before, par_after, context) {
             for (l = 0; l < lineList[i].elements.length; l++) {
 
                 thisNode = lineList[i].elements[l];
-                padding = s * (thisNode.before - frontier) + 'px';
+                padding = s * (thisNode.before - frontier) + "px";
 
-                if (context.bpd === 'lr') {
+                if (context.bpd === "lr") {
 
                     thisNode.node.style.paddingLeft = padding;
 
-                } else if (context.bpd === 'rl') {
+                } else if (context.bpd === "rl") {
 
                     thisNode.node.style.paddingRight = padding;
 
-                } else if (context.bpd === 'tb') {
+                } else if (context.bpd === "tb") {
 
                     thisNode.node.style.paddingTop = padding;
 
@@ -1068,12 +1068,12 @@ function rect2edges(rect, context) {
 
     const edges = { before: null, after: null, start: null, end: null };
 
-    if (context.bpd === 'tb') {
+    if (context.bpd === "tb") {
 
         edges.before = rect.top;
         edges.after = rect.bottom;
 
-        if (context.ipd === 'lr') {
+        if (context.ipd === "lr") {
 
             edges.start = rect.left;
             edges.end = rect.right;
@@ -1084,14 +1084,14 @@ function rect2edges(rect, context) {
             edges.end = rect.left;
         }
 
-    } else if (context.bpd === 'lr') {
+    } else if (context.bpd === "lr") {
 
         edges.before = rect.left;
         edges.after = rect.right;
         edges.start = rect.top;
         edges.end = rect.bottom;
 
-    } else if (context.bpd === 'rl') {
+    } else if (context.bpd === "rl") {
 
         edges.before = rect.right;
         edges.after = rect.left;
@@ -1106,7 +1106,7 @@ function rect2edges(rect, context) {
 
 function constructLineList(context, element, llist, bgcolor) {
 
-    if (element.localName === 'rt' || element.localName === 'rtc') {
+    if (element.localName === "rt" || element.localName === "rtc") {
 
         /* skip ruby annotations */
 
@@ -1118,7 +1118,7 @@ function constructLineList(context, element, llist, bgcolor) {
 
     if (element.childElementCount === 0) {
 
-        if (element.localName === 'span' || element.localName === 'rb') {
+        if (element.localName === "span" || element.localName === "rb") {
 
             const r = element.getBoundingClientRect();
 
@@ -1137,7 +1137,7 @@ function constructLineList(context, element, llist, bgcolor) {
                     elements: [],
                     rbc: [],
                     te: [],
-                    text: '',
+                    text: "",
                     br: false,
                 });
 
@@ -1182,7 +1182,7 @@ function constructLineList(context, element, llist, bgcolor) {
                 },
             );
 
-        } else if (element.localName === 'br' && llist.length !== 0) {
+        } else if (element.localName === "br" && llist.length !== 0) {
 
             llist[llist.length - 1].br = true;
 
@@ -1198,7 +1198,7 @@ function constructLineList(context, element, llist, bgcolor) {
 
                 constructLineList(context, child, llist, curbgcolor);
 
-                if (child.localName === 'ruby' || child.localName === 'rtc') {
+                if (child.localName === "ruby" || child.localName === "rtc") {
 
                     /* remember non-empty ruby and rtc elements so that tts:rubyPosition can be applied */
 
@@ -1208,9 +1208,9 @@ function constructLineList(context, element, llist, bgcolor) {
 
                     }
 
-                } else if (child.localName === 'span' &&
+                } else if (child.localName === "span" &&
                     child.style[TEXTEMPHASISSTYLE_PROP] &&
-                    child.style[TEXTEMPHASISSTYLE_PROP] !== 'none') {
+                    child.style[TEXTEMPHASISSTYLE_PROP] !== "none") {
 
                     /* remember non-empty span elements with textEmphasis */
 
@@ -1240,40 +1240,40 @@ function applyTextEmphasis(context, dom_element, isd_element, attr) {
 
     /* ignore color (not used in IMSC 1.1) */
 
-    if (attr.style === 'none') {
+    if (attr.style === "none") {
 
         /* text-emphasis is not inherited and the default is none, so nothing to do */
 
         return;
 
-    } else if (attr.style === 'auto') {
+    } else if (attr.style === "auto") {
 
-        dom_element.style[TEXTEMPHASISSTYLE_PROP] = 'filled';
+        dom_element.style[TEXTEMPHASISSTYLE_PROP] = "filled";
 
     } else {
 
-        dom_element.style[TEXTEMPHASISSTYLE_PROP] = attr.style + ' ' + attr.symbol;
+        dom_element.style[TEXTEMPHASISSTYLE_PROP] = attr.style + " " + attr.symbol;
     }
 
     /* ignore "outside" position (set in postprocessing) */
 
-    if (attr.position === 'before' || attr.position === 'after') {
+    if (attr.position === "before" || attr.position === "after") {
 
         let pos;
 
-        if (context.bpd === 'tb') {
+        if (context.bpd === "tb") {
 
-            pos = (attr.position === 'before') ? 'left over' : 'left under';
+            pos = (attr.position === "before") ? "left over" : "left under";
 
         } else {
 
-            if (context.bpd === 'rl') {
+            if (context.bpd === "rl") {
 
-                pos = (attr.position === 'before') ? 'right under' : 'left under';
+                pos = (attr.position === "before") ? "right under" : "left under";
 
             } else {
 
-                pos = (attr.position === 'before') ? 'left under' : 'right under';
+                pos = (attr.position === "before") ? "left under" : "right under";
 
             }
 
@@ -1293,34 +1293,34 @@ class HTMLStylingMapDefinition {
 const STYLING_MAP_DEFS = [
 
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling backgroundColor',
+        "http://www.w3.org/ns/ttml#styling backgroundColor",
         function (context, dom_element, isd_element, attr) {
 
             /* skip if transparent */
             if (attr[3] === 0)
                 return;
 
-            dom_element.style.backgroundColor = 'rgba(' +
-                attr[0].toString() + ',' +
-                attr[1].toString() + ',' +
-                attr[2].toString() + ',' +
+            dom_element.style.backgroundColor = "rgba(" +
+                attr[0].toString() + "," +
+                attr[1].toString() + "," +
+                attr[2].toString() + "," +
                 (attr[3] / 255).toString() +
-                ')';
+                ")";
         },
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling color',
+        "http://www.w3.org/ns/ttml#styling color",
         function (context, dom_element, isd_element, attr) {
-            dom_element.style.color = 'rgba(' +
-                attr[0].toString() + ',' +
-                attr[1].toString() + ',' +
-                attr[2].toString() + ',' +
+            dom_element.style.color = "rgba(" +
+                attr[0].toString() + "," +
+                attr[1].toString() + "," +
+                attr[2].toString() + "," +
                 (attr[3] / 255).toString() +
-                ')';
+                ")";
         },
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling direction',
+        "http://www.w3.org/ns/ttml#styling direction",
         function (context, dom_element, isd_element, attr) {
 
             dom_element.style.direction = attr;
@@ -1328,37 +1328,37 @@ const STYLING_MAP_DEFS = [
         },
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling display',
+        "http://www.w3.org/ns/ttml#styling display",
         function () { },
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling displayAlign',
+        "http://www.w3.org/ns/ttml#styling displayAlign",
         function (context, dom_element, isd_element, attr) {
 
             /* see https://css-tricks.com/snippets/css/a-guide-to-flexbox/ */
 
             /* TODO: is this affected by writing direction? */
 
-            dom_element.style.display = 'flex';
-            dom_element.style.flexDirection = 'column';
+            dom_element.style.display = "flex";
+            dom_element.style.flexDirection = "column";
 
-            if (attr === 'before') {
+            if (attr === "before") {
 
-                dom_element.style.justifyContent = 'flex-start';
+                dom_element.style.justifyContent = "flex-start";
 
-            } else if (attr === 'center') {
+            } else if (attr === "center") {
 
-                dom_element.style.justifyContent = 'center';
+                dom_element.style.justifyContent = "center";
 
-            } else if (attr === 'after') {
+            } else if (attr === "after") {
 
-                dom_element.style.justifyContent = 'flex-end';
+                dom_element.style.justifyContent = "flex-end";
             }
 
         },
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling extent',
+        "http://www.w3.org/ns/ttml#styling extent",
         function (context, dom_element, isd_element, attr) {
             /* TODO: this is super ugly */
 
@@ -1373,7 +1373,7 @@ const STYLING_MAP_DEFS = [
             let hdelta = 0;
             let wdelta = 0;
 
-            const p = isd_element.styleAttrs['http://www.w3.org/ns/ttml#styling padding'];
+            const p = isd_element.styleAttrs["http://www.w3.org/ns/ttml#styling padding"];
 
             if (!p) {
 
@@ -1386,13 +1386,13 @@ const STYLING_MAP_DEFS = [
 
             }
 
-            dom_element.style.height = (context.regionH - hdelta) + 'px';
-            dom_element.style.width = (context.regionW - wdelta) + 'px';
+            dom_element.style.height = (context.regionH - hdelta) + "px";
+            dom_element.style.width = (context.regionW - wdelta) + "px";
 
         },
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling fontFamily',
+        "http://www.w3.org/ns/ttml#styling fontFamily",
         function (context, dom_element, isd_element, attr) {
 
             let rslt = [];
@@ -1402,40 +1402,40 @@ const STYLING_MAP_DEFS = [
             for (let i = 0; i < attr.length; i++) {
                 attr[i] = attr[i].trim();
 
-                if (attr[i] === 'monospaceSerif') {
+                if (attr[i] === "monospaceSerif") {
 
-                    rslt.push('Courier New');
+                    rslt.push("Courier New");
                     rslt.push('"Liberation Mono"');
-                    rslt.push('Courier');
-                    rslt.push('monospace');
+                    rslt.push("Courier");
+                    rslt.push("monospace");
 
-                } else if (attr[i] === 'proportionalSansSerif') {
+                } else if (attr[i] === "proportionalSansSerif") {
 
-                    rslt.push('Arial');
-                    rslt.push('Helvetica');
+                    rslt.push("Arial");
+                    rslt.push("Helvetica");
                     rslt.push('"Liberation Sans"');
-                    rslt.push('sans-serif');
+                    rslt.push("sans-serif");
 
-                } else if (attr[i] === 'monospace') {
+                } else if (attr[i] === "monospace") {
 
-                    rslt.push('monospace');
+                    rslt.push("monospace");
 
-                } else if (attr[i] === 'sansSerif') {
+                } else if (attr[i] === "sansSerif") {
 
-                    rslt.push('sans-serif');
+                    rslt.push("sans-serif");
 
-                } else if (attr[i] === 'serif') {
+                } else if (attr[i] === "serif") {
 
-                    rslt.push('serif');
+                    rslt.push("serif");
 
-                } else if (attr[i] === 'monospaceSansSerif') {
+                } else if (attr[i] === "monospaceSansSerif") {
 
-                    rslt.push('Consolas');
-                    rslt.push('monospace');
+                    rslt.push("Consolas");
+                    rslt.push("monospace");
 
-                } else if (attr[i] === 'proportionalSerif') {
+                } else if (attr[i] === "proportionalSerif") {
 
-                    rslt.push('serif');
+                    rslt.push("serif");
 
                 } else {
 
@@ -1462,12 +1462,12 @@ const STYLING_MAP_DEFS = [
                 rslt = unique;
             }
 
-            dom_element.style.fontFamily = rslt.join(',');
+            dom_element.style.fontFamily = rslt.join(",");
         },
     ),
 
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling shear',
+        "http://www.w3.org/ns/ttml#styling shear",
         function (context, dom_element, isd_element, attr) {
 
             /* return immediately if tts:shear is 0% since CSS transforms are not inherited*/
@@ -1479,13 +1479,13 @@ const STYLING_MAP_DEFS = [
 
             /* context.bpd is needed since writing mode is not inherited and sets the inline progression */
 
-            if (context.bpd === 'tb') {
+            if (context.bpd === "tb") {
 
-                dom_element.style.transform = 'skewX(' + angle + 'deg)';
+                dom_element.style.transform = "skewX(" + angle + "deg)";
 
             } else {
 
-                dom_element.style.transform = 'skewY(' + angle + 'deg)';
+                dom_element.style.transform = "skewY(" + angle + "deg)";
 
             }
 
@@ -1493,58 +1493,58 @@ const STYLING_MAP_DEFS = [
     ),
 
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling fontSize',
+        "http://www.w3.org/ns/ttml#styling fontSize",
         function (context, dom_element, isd_element, attr) {
-            dom_element.style.fontSize = attr.toUsedLength(context.w, context.h) + 'px';
+            dom_element.style.fontSize = attr.toUsedLength(context.w, context.h) + "px";
         },
     ),
 
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling fontStyle',
+        "http://www.w3.org/ns/ttml#styling fontStyle",
         function (context, dom_element, isd_element, attr) {
             dom_element.style.fontStyle = attr;
         },
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling fontWeight',
+        "http://www.w3.org/ns/ttml#styling fontWeight",
         function (context, dom_element, isd_element, attr) {
             dom_element.style.fontWeight = attr;
         },
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling lineHeight',
+        "http://www.w3.org/ns/ttml#styling lineHeight",
         function (context, dom_element, isd_element, attr) {
-            if (attr === 'normal') {
+            if (attr === "normal") {
 
-                dom_element.style.lineHeight = 'normal';
+                dom_element.style.lineHeight = "normal";
 
             } else {
 
-                dom_element.style.lineHeight = attr.toUsedLength(context.w, context.h) + 'px';
+                dom_element.style.lineHeight = attr.toUsedLength(context.w, context.h) + "px";
             }
         },
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling opacity',
+        "http://www.w3.org/ns/ttml#styling opacity",
         function (context, dom_element, isd_element, attr) {
             dom_element.style.opacity = attr;
         },
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling origin',
+        "http://www.w3.org/ns/ttml#styling origin",
         function (context, dom_element, isd_element, attr) {
-            dom_element.style.top = attr.h.toUsedLength(context.w, context.h) + 'px';
-            dom_element.style.left = attr.w.toUsedLength(context.w, context.h) + 'px';
+            dom_element.style.top = attr.h.toUsedLength(context.w, context.h) + "px";
+            dom_element.style.left = attr.w.toUsedLength(context.w, context.h) + "px";
         },
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling overflow',
+        "http://www.w3.org/ns/ttml#styling overflow",
         function (context, dom_element, isd_element, attr) {
             dom_element.style.overflow = attr;
         },
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling padding',
+        "http://www.w3.org/ns/ttml#styling padding",
         function (context, dom_element, isd_element, attr) {
 
             /* attr: top,left,bottom,right*/
@@ -1553,34 +1553,34 @@ const STYLING_MAP_DEFS = [
 
             const rslt = [];
 
-            rslt[0] = attr[0].toUsedLength(context.w, context.h) + 'px';
-            rslt[1] = attr[3].toUsedLength(context.w, context.h) + 'px';
-            rslt[2] = attr[2].toUsedLength(context.w, context.h) + 'px';
-            rslt[3] = attr[1].toUsedLength(context.w, context.h) + 'px';
+            rslt[0] = attr[0].toUsedLength(context.w, context.h) + "px";
+            rslt[1] = attr[3].toUsedLength(context.w, context.h) + "px";
+            rslt[2] = attr[2].toUsedLength(context.w, context.h) + "px";
+            rslt[3] = attr[1].toUsedLength(context.w, context.h) + "px";
 
-            dom_element.style.padding = rslt.join(' ');
+            dom_element.style.padding = rslt.join(" ");
         },
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling position',
+        "http://www.w3.org/ns/ttml#styling position",
         function (context, dom_element, isd_element, attr) {
-            dom_element.style.top = attr.h.toUsedLength(context.w, context.h) + 'px';
-            dom_element.style.left = attr.w.toUsedLength(context.w, context.h) + 'px';
+            dom_element.style.top = attr.h.toUsedLength(context.w, context.h) + "px";
+            dom_element.style.left = attr.w.toUsedLength(context.w, context.h) + "px";
         },
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling rubyAlign',
+        "http://www.w3.org/ns/ttml#styling rubyAlign",
         function (context, dom_element, isd_element, attr) {
-            dom_element.style.rubyAlign = attr === 'spaceAround' ? 'space-around' : 'center';
+            dom_element.style.rubyAlign = attr === "spaceAround" ? "space-around" : "center";
         },
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling rubyPosition',
+        "http://www.w3.org/ns/ttml#styling rubyPosition",
         function (context, dom_element, isd_element, attr) {
 
             /* skip if "outside", which is handled by applyRubyPosition() */
 
-            if (attr === 'before' || attr === 'after') {
+            if (attr === "before" || attr === "after") {
 
                 let pos;
 
@@ -1590,19 +1590,19 @@ const STYLING_MAP_DEFS = [
 
                     pos = attr;
 
-                } else if (context.bpd === 'tb') {
+                } else if (context.bpd === "tb") {
 
-                    pos = (attr === 'before') ? 'over' : 'under';
+                    pos = (attr === "before") ? "over" : "under";
 
                 } else {
 
-                    if (context.bpd === 'rl') {
+                    if (context.bpd === "rl") {
 
-                        pos = (attr === 'before') ? 'over' : 'under';
+                        pos = (attr === "before") ? "over" : "under";
 
                     } else {
 
-                        pos = (attr === 'before') ? 'under' : 'over';
+                        pos = (attr === "before") ? "under" : "over";
 
                     }
 
@@ -1615,24 +1615,24 @@ const STYLING_MAP_DEFS = [
         },
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling showBackground',
+        "http://www.w3.org/ns/ttml#styling showBackground",
         null,
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling textAlign',
+        "http://www.w3.org/ns/ttml#styling textAlign",
         function (context, dom_element, isd_element, attr) {
 
             let ta;
 
             /* handle UAs that do not understand start or end */
 
-            if (attr === 'start') {
+            if (attr === "start") {
 
-                ta = (context.ipd === 'rl') ? 'right' : 'left';
+                ta = (context.ipd === "rl") ? "right" : "left";
 
-            } else if (attr === 'end') {
+            } else if (attr === "end") {
 
-                ta = (context.ipd === 'rl') ? 'left' : 'right';
+                ta = (context.ipd === "rl") ? "left" : "right";
 
             } else {
 
@@ -1645,78 +1645,78 @@ const STYLING_MAP_DEFS = [
         },
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling textDecoration',
+        "http://www.w3.org/ns/ttml#styling textDecoration",
         function (context, dom_element, isd_element, attr) {
-            dom_element.style.textDecoration = attr.join(' ').replace('lineThrough', 'line-through');
+            dom_element.style.textDecoration = attr.join(" ").replace("lineThrough", "line-through");
         },
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling textOutline',
+        "http://www.w3.org/ns/ttml#styling textOutline",
         function () {
 
             /* defer to tts:textShadow */
         },
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling textShadow',
+        "http://www.w3.org/ns/ttml#styling textShadow",
         function (context, dom_element, isd_element, attr) {
 
             const txto = isd_element.styleAttrs[byName.textOutline.qname];
 
-            if (attr === 'none' && txto === 'none') {
+            if (attr === "none" && txto === "none") {
 
-                dom_element.style.textShadow = '';
+                dom_element.style.textShadow = "";
 
             } else {
 
                 const s = [];
 
-                if (txto !== 'none') {
+                if (txto !== "none") {
 
                     /* emulate text outline */
 
-                    const to_color = 'rgba(' +
-                        txto.color[0].toString() + ',' +
-                        txto.color[1].toString() + ',' +
-                        txto.color[2].toString() + ',' +
+                    const to_color = "rgba(" +
+                        txto.color[0].toString() + "," +
+                        txto.color[1].toString() + "," +
+                        txto.color[2].toString() + "," +
                         (txto.color[3] / 255).toString() +
-                        ')';
+                        ")";
 
-                    s.push('1px 1px 1px ' + to_color);
-                    s.push('-1px 1px 1px ' + to_color);
-                    s.push('1px -1px 1px ' + to_color);
-                    s.push('-1px -1px 1px ' + to_color);
+                    s.push("1px 1px 1px " + to_color);
+                    s.push("-1px 1px 1px " + to_color);
+                    s.push("1px -1px 1px " + to_color);
+                    s.push("-1px -1px 1px " + to_color);
 
                 }
 
                 /* add text shadow */
 
-                if (attr !== 'none') {
+                if (attr !== "none") {
 
                     for (let i = 0; i < attr.length; i++) {
 
-                        s.push(attr[i].x_off.toUsedLength(context.w, context.h) + 'px ' +
-                            attr[i].y_off.toUsedLength(context.w, context.h) + 'px ' +
-                            attr[i].b_radius.toUsedLength(context.w, context.h) + 'px ' +
-                            'rgba(' +
-                            attr[i].color[0].toString() + ',' +
-                            attr[i].color[1].toString() + ',' +
-                            attr[i].color[2].toString() + ',' +
+                        s.push(attr[i].x_off.toUsedLength(context.w, context.h) + "px " +
+                            attr[i].y_off.toUsedLength(context.w, context.h) + "px " +
+                            attr[i].b_radius.toUsedLength(context.w, context.h) + "px " +
+                            "rgba(" +
+                            attr[i].color[0].toString() + "," +
+                            attr[i].color[1].toString() + "," +
+                            attr[i].color[2].toString() + "," +
                             (attr[i].color[3] / 255).toString() +
-                            ')',
+                            ")",
                         );
 
                     }
 
                 }
 
-                dom_element.style.textShadow = s.join(',');
+                dom_element.style.textShadow = s.join(",");
 
             }
         },
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling textCombine',
+        "http://www.w3.org/ns/ttml#styling textCombine",
         function (context, dom_element, isd_element, attr) {
 
             dom_element.style.textCombineUpright = attr;
@@ -1724,7 +1724,7 @@ const STYLING_MAP_DEFS = [
         },
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling textEmphasis',
+        "http://www.w3.org/ns/ttml#styling textEmphasis",
         function () {
 
             /* applied as part of HTML document construction */
@@ -1732,13 +1732,13 @@ const STYLING_MAP_DEFS = [
         },
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling unicodeBidi',
+        "http://www.w3.org/ns/ttml#styling unicodeBidi",
         function (context, dom_element, isd_element, attr) {
 
             let ub;
 
-            if (attr === 'bidiOverride') {
-                ub = 'bidi-override';
+            if (attr === "bidiOverride") {
+                ub = "bidi-override";
             } else {
                 ub = attr;
             }
@@ -1747,31 +1747,31 @@ const STYLING_MAP_DEFS = [
         },
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling visibility',
+        "http://www.w3.org/ns/ttml#styling visibility",
         function (context, dom_element, isd_element, attr) {
             dom_element.style.visibility = attr;
         },
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling wrapOption',
+        "http://www.w3.org/ns/ttml#styling wrapOption",
         function (context, dom_element, isd_element, attr) {
 
-            if (attr === 'wrap') {
+            if (attr === "wrap") {
 
-                if (isd_element.space === 'preserve') {
-                    dom_element.style.whiteSpace = 'pre-wrap';
+                if (isd_element.space === "preserve") {
+                    dom_element.style.whiteSpace = "pre-wrap";
                 } else {
-                    dom_element.style.whiteSpace = 'normal';
+                    dom_element.style.whiteSpace = "normal";
                 }
 
             } else {
 
-                if (isd_element.space === 'preserve') {
+                if (isd_element.space === "preserve") {
 
-                    dom_element.style.whiteSpace = 'pre';
+                    dom_element.style.whiteSpace = "pre";
 
                 } else {
-                    dom_element.style.whiteSpace = 'noWrap';
+                    dom_element.style.whiteSpace = "noWrap";
                 }
 
             }
@@ -1779,41 +1779,41 @@ const STYLING_MAP_DEFS = [
         },
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling writingMode',
+        "http://www.w3.org/ns/ttml#styling writingMode",
         function (context, dom_element, isd_element, attr) {
 
-            if (attr === 'lrtb' || attr === 'lr') {
+            if (attr === "lrtb" || attr === "lr") {
 
-                dom_element.style.writingMode = 'horizontal-tb';
+                dom_element.style.writingMode = "horizontal-tb";
 
-            } else if (attr === 'rltb' || attr === 'rl') {
+            } else if (attr === "rltb" || attr === "rl") {
 
-                dom_element.style.writingMode = 'horizontal-tb';
+                dom_element.style.writingMode = "horizontal-tb";
 
-            } else if (attr === 'tblr') {
+            } else if (attr === "tblr") {
 
-                dom_element.style.writingMode = 'vertical-lr';
+                dom_element.style.writingMode = "vertical-lr";
 
-            } else if (attr === 'tbrl' || attr === 'tb') {
+            } else if (attr === "tbrl" || attr === "tb") {
 
-                dom_element.style.writingMode = 'vertical-rl';
+                dom_element.style.writingMode = "vertical-rl";
 
             }
 
         },
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml#styling zIndex',
+        "http://www.w3.org/ns/ttml#styling zIndex",
         function (context, dom_element, isd_element, attr) {
             dom_element.style.zIndex = attr;
         },
     ),
     new HTMLStylingMapDefinition(
-        'http://www.w3.org/ns/ttml/profile/imsc1#styling forcedDisplay',
+        "http://www.w3.org/ns/ttml/profile/imsc1#styling forcedDisplay",
         function (context, dom_element, isd_element, attr) {
 
             if (context.displayForcedOnlyMode && attr === false) {
-                dom_element.style.visibility = 'hidden';
+                dom_element.style.visibility = "hidden";
             }
 
         },
@@ -1829,10 +1829,10 @@ for (let i = 0; i < STYLING_MAP_DEFS.length; i++) {
 
 /* CSS property names */
 
-const RUBYPOSITION_ISWK = 'webkitRubyPosition' in window.getComputedStyle(document.documentElement);
+const RUBYPOSITION_ISWK = "webkitRubyPosition" in window.getComputedStyle(document.documentElement);
 
-const RUBYPOSITION_PROP = RUBYPOSITION_ISWK ? 'webkitRubyPosition' : 'rubyPosition';
+const RUBYPOSITION_PROP = RUBYPOSITION_ISWK ? "webkitRubyPosition" : "rubyPosition";
 
-const TEXTEMPHASISSTYLE_PROP = 'webkitTextEmphasisStyle' in window.getComputedStyle(document.documentElement) ? 'webkitTextEmphasisStyle' : 'textEmphasisStyle';
+const TEXTEMPHASISSTYLE_PROP = "webkitTextEmphasisStyle" in window.getComputedStyle(document.documentElement) ? "webkitTextEmphasisStyle" : "textEmphasisStyle";
 
-const TEXTEMPHASISPOSITION_PROP = 'webkitTextEmphasisPosition' in window.getComputedStyle(document.documentElement) ? 'webkitTextEmphasisPosition' : 'textEmphasisPosition';
+const TEXTEMPHASISPOSITION_PROP = "webkitTextEmphasisPosition" in window.getComputedStyle(document.documentElement) ? "webkitTextEmphasisPosition" : "textEmphasisPosition";
diff --git a/src/main/js/isd.js b/src/main/js/isd.js
index 3b03f12a..b3880e06 100644
--- a/src/main/js/isd.js
+++ b/src/main/js/isd.js
@@ -24,9 +24,9 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-import { reportError } from './error.js';
-import { all, byName, byQName } from './styles.js';
-import { ComputedLength, hasOwnProperty } from './utils.js';
+import { reportError } from "./error.js";
+import { all, byName, byQName } from "./styles.js";
+import { ComputedLength, hasOwnProperty } from "./utils.js";
 
 /**
  * @module imscISD
@@ -73,7 +73,7 @@ export function generateISD(tt, offset, errorHandler) {
             const showBackground = region.styleAttrs[byName.showBackground.qname] || initialShowBackground;
             const backgroundColor = region.styleAttrs[byName.backgroundColor.qname] || initialbackgroundColor;
             activeRegions[region.id] = (
-                (showBackground === 'always' || showBackground === undefined) &&
+                (showBackground === "always" || showBackground === undefined) &&
                 backgroundColor !== undefined &&
                 !(offset < region.begin || offset >= region.end)
             );
@@ -123,8 +123,8 @@ export function generateISD(tt, offset, errorHandler) {
     }
 
     /* rewritten TTML will always have a default - this covers it. because the region is defaulted to "" */
-    if (activeRegions[''] !== undefined) {
-        activeRegions[''] = true;
+    if (activeRegions[""] !== undefined) {
+        activeRegions[""] = true;
     }
 
     /* process regions */
@@ -132,7 +132,7 @@ export function generateISD(tt, offset, errorHandler) {
         if (activeRegions[regionID]) {
             /* post-order traversal of the body tree per [construct intermediate document] */
 
-            const c = isdProcessContentElement(tt, offset, tt.head.layout.regions[regionID], body, null, '', tt.head.layout.regions[regionID], errorHandler, context);
+            const c = isdProcessContentElement(tt, offset, tt.head.layout.regions[regionID], body, null, "", tt.head.layout.regions[regionID], errorHandler, context);
 
             if (c !== null) {
 
@@ -170,7 +170,7 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
      * inherited associated region otherwise
      */
 
-    const associated_region_id = 'regionID' in elem && elem.regionID !== '' ? elem.regionID : inherited_region_id;
+    const associated_region_id = "regionID" in elem && elem.regionID !== "" ? elem.regionID : inherited_region_id;
 
     /* prune the element if either:
      * - the element is not terminal and the associated region is neither the default
@@ -184,9 +184,9 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
     if (parent !== null /* are we in the region element */ &&
         associated_region_id !== region.id &&
         (
-            (!('contents' in elem)) ||
-            ('contents' in elem && elem.contents.length === 0) ||
-            associated_region_id !== ''
+            (!("contents" in elem)) ||
+            ("contents" in elem && elem.contents.length === 0) ||
+            associated_region_id !== ""
         )
     )
         return null;
@@ -198,7 +198,7 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
 
     /* apply set (animation) styling */
 
-    if ('sets' in elem) {
+    if ("sets" in elem) {
         for (let i = 0; i < elem.sets.length; i++) {
 
             if (offset < elem.sets[i].begin || offset >= elem.sets[i].end)
@@ -227,19 +227,19 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
          * if writingMode sets inline-direction to LTR or RTL
          */
 
-        if (isd_element.kind === 'region' &&
+        if (isd_element.kind === "region" &&
             qname === byName.writingMode.qname &&
             !(byName.direction.qname in styleAttrs)) {
 
             const wm = styleAttrs[qname];
 
-            if (wm === 'lrtb' || wm === 'lr') {
+            if (wm === "lrtb" || wm === "lr") {
 
-                styleAttrs[byName.direction.qname] = 'ltr';
+                styleAttrs[byName.direction.qname] = "ltr";
 
-            } else if (wm === 'rltb' || wm === 'rl') {
+            } else if (wm === "rltb" || wm === "rl") {
 
-                styleAttrs[byName.direction.qname] = 'rtl';
+                styleAttrs[byName.direction.qname] = "rtl";
 
             }
 
@@ -268,35 +268,35 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
 
                     outs = ps;
 
-                } else if (es.indexOf('none') === -1) {
+                } else if (es.indexOf("none") === -1) {
 
-                    if ((es.indexOf('noUnderline') === -1 &&
-                        ps.indexOf('underline') !== -1) ||
-                        es.indexOf('underline') !== -1) {
+                    if ((es.indexOf("noUnderline") === -1 &&
+                        ps.indexOf("underline") !== -1) ||
+                        es.indexOf("underline") !== -1) {
 
-                        outs.push('underline');
+                        outs.push("underline");
 
                     }
 
-                    if ((es.indexOf('noLineThrough') === -1 &&
-                        ps.indexOf('lineThrough') !== -1) ||
-                        es.indexOf('lineThrough') !== -1) {
+                    if ((es.indexOf("noLineThrough") === -1 &&
+                        ps.indexOf("lineThrough") !== -1) ||
+                        es.indexOf("lineThrough") !== -1) {
 
-                        outs.push('lineThrough');
+                        outs.push("lineThrough");
 
                     }
 
-                    if ((es.indexOf('noOverline') === -1 &&
-                        ps.indexOf('overline') !== -1) ||
-                        es.indexOf('overline') !== -1) {
+                    if ((es.indexOf("noOverline") === -1 &&
+                        ps.indexOf("overline") !== -1) ||
+                        es.indexOf("overline") !== -1) {
 
-                        outs.push('overline');
+                        outs.push("overline");
 
                     }
 
                 } else {
 
-                    outs.push('none');
+                    outs.push("none");
 
                 }
 
@@ -304,8 +304,8 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
 
             } else if (sa.qname === byName.fontSize.qname &&
                 !(sa.qname in styleAttrs) &&
-                isd_element.kind === 'span' &&
-                styleAttrs[byName.ruby.qname] === 'textContainer') {
+                isd_element.kind === "span" &&
+                styleAttrs[byName.ruby.qname] === "textContainer") {
 
                 /* special inheritance rule for ruby text container font size */
 
@@ -317,14 +317,14 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
 
             } else if (sa.qname === byName.fontSize.qname &&
                 !(sa.qname in styleAttrs) &&
-                isd_element.kind === 'span' &&
-                styleAttrs[byName.ruby.qname] === 'text') {
+                isd_element.kind === "span" &&
+                styleAttrs[byName.ruby.qname] === "text") {
 
                 /* special inheritance rule for ruby text font size */
 
                 const parent_fs = parent.styleAttrs[byName.fontSize.qname];
 
-                if (parent.styleAttrs[byName.ruby.qname] === 'textContainer') {
+                if (parent.styleAttrs[byName.ruby.qname] === "textContainer") {
 
                     styleAttrs[sa.qname] = parent_fs;
 
@@ -381,7 +381,7 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
 
         /* apply initial value to elements other than region only if non-inherited */
 
-        if (isd_element.kind === 'region' || (ivs.inherit === false && iv !== null)) {
+        if (isd_element.kind === "region" || (ivs.inherit === false && iv !== null)) {
 
             const piv = ivs.parse(iv);
 
@@ -447,7 +447,7 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
 
     /* prune if tts:display is none */
 
-    if (styleAttrs[byName.display.qname] === 'none')
+    if (styleAttrs[byName.display.qname] === "none")
         return null;
 
     /* process contents of the element */
@@ -472,7 +472,7 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
 
         }
 
-    } else if ('contents' in elem) {
+    } else if ("contents" in elem) {
 
         contents = elem.contents;
 
@@ -507,23 +507,23 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
         /* special applicability of certain style properties to ruby container spans */
         /* TODO: in the future ruby elements should be translated to elements instead of kept as spans */
 
-        if (isd_element.kind === 'span') {
+        if (isd_element.kind === "span") {
 
             const rsp = styleAttrs[byName.ruby.qname];
 
-            na = (rsp === 'container' || rsp === 'textContainer' || rsp === 'baseContainer') &&
+            na = (rsp === "container" || rsp === "textContainer" || rsp === "baseContainer") &&
                 _rcs_na_styles.indexOf(qnameb) !== -1;
 
             if (!na) {
 
-                na = rsp !== 'container' &&
+                na = rsp !== "container" &&
                     qnameb === byName.rubyAlign.qname;
 
             }
 
             if (!na) {
 
-                na = (!(rsp === 'textContainer' || rsp === 'text')) &&
+                na = (!(rsp === "textContainer" || rsp === "text")) &&
                     qnameb === byName.rubyPosition.qname;
 
             }
@@ -536,7 +536,7 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
 
             const da = byQName[qnameb];
 
-            if ('applies' in da) {
+            if ("applies" in da) {
 
                 na = da.applies.indexOf(isd_element.kind) === -1;
 
@@ -554,8 +554,8 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
 
     const ruby = styleAttrs[byName.ruby.qname];
 
-    if (isd_element.kind === 'p' ||
-        (isd_element.kind === 'span' && (ruby === 'textContainer' || ruby === 'text'))
+    if (isd_element.kind === "p" ||
+        (isd_element.kind === "span" && (ruby === "textContainer" || ruby === "text"))
     ) {
 
         const elist = [];
@@ -577,13 +577,13 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
      * * if region and showBackground = always
      */
 
-    if ((isd_element.kind === 'div' && byName.backgroundImage.qname in styleAttrs) ||
-        isd_element.kind === 'br' ||
-        isd_element.kind === 'image' ||
-        ('contents' in isd_element && isd_element.contents.length > 0) ||
-        (isd_element.kind === 'span' && isd_element.text !== null) ||
-        (isd_element.kind === 'region' &&
-            styleAttrs[byName.showBackground.qname] === 'always')) {
+    if ((isd_element.kind === "div" && byName.backgroundImage.qname in styleAttrs) ||
+        isd_element.kind === "br" ||
+        isd_element.kind === "image" ||
+        ("contents" in isd_element && isd_element.contents.length > 0) ||
+        (isd_element.kind === "span" && isd_element.text !== null) ||
+        (isd_element.kind === "region" &&
+            styleAttrs[byName.showBackground.qname] === "always")) {
 
         return {
             region_id: associated_region_id,
@@ -597,11 +597,11 @@ function isdProcessContentElement(doc, offset, region, body, parent, inherited_r
 function collapseLWSP(elist) {
 
     function isPrevCharLWSP(prev_element) {
-        return prev_element.kind === 'br' || /[\r\n\t ]$/.test(prev_element.text);
+        return prev_element.kind === "br" || /[\r\n\t ]$/.test(prev_element.text);
     }
 
     function isNextCharLWSP(next_element) {
-        return next_element.kind === 'br' || (next_element.space === 'preserve' && /^[\r\n]/.test(next_element.text));
+        return next_element.kind === "br" || (next_element.space === "preserve" && /^[\r\n]/.test(next_element.text));
     }
 
     /* collapse spaces and remove leading LWSPs */
@@ -612,12 +612,12 @@ function collapseLWSP(elist) {
 
         element = elist[i];
 
-        if (element.kind === 'br' || element.space === 'preserve') {
+        if (element.kind === "br" || element.space === "preserve") {
             i++;
             continue;
         }
 
-        let trimmed_text = element.text.replace(/[\t\r\n ]+/g, ' ');
+        let trimmed_text = element.text.replace(/[\t\r\n ]+/g, " ");
 
         if (/^[ ]/.test(trimmed_text)) {
 
@@ -643,7 +643,7 @@ function collapseLWSP(elist) {
 
         element = elist[i];
 
-        if (element.kind === 'br' || element.space === 'preserve') {
+        if (element.kind === "br" || element.space === "preserve") {
             i++;
             continue;
         }
@@ -662,7 +662,7 @@ function collapseLWSP(elist) {
 
 function constructSpanList(element, elist) {
 
-    if (!('contents' in element)) {
+    if (!("contents" in element)) {
         return;
     }
 
@@ -671,17 +671,17 @@ function constructSpanList(element, elist) {
         const child = element.contents[i];
         const ruby = child.styleAttrs[byName.ruby.qname];
 
-        if (child.kind === 'span' && (ruby === 'textContainer' || ruby === 'text')) {
+        if (child.kind === "span" && (ruby === "textContainer" || ruby === "text")) {
 
             /* skip ruby text and text containers, which are handled on their own */
 
             continue;
 
-        } else if ('contents' in child) {
+        } else if ("contents" in child) {
 
             constructSpanList(child, elist);
 
-        } else if ((child.kind === 'span' && child.text.length !== 0) || child.kind === 'br') {
+        } else if ((child.kind === "span" && child.text.length !== 0) || child.kind === "br") {
 
             /* skip empty spans */
 
@@ -695,15 +695,15 @@ function constructSpanList(element, elist) {
 
 function pruneEmptySpans(element) {
 
-    if (element.kind === 'br') {
+    if (element.kind === "br") {
 
         return false;
 
-    } else if ('text' in element) {
+    } else if ("text" in element) {
 
         return element.text.length === 0;
 
-    } else if ('contents' in element) {
+    } else if ("contents" in element) {
 
         let i = element.contents.length;
 
@@ -733,7 +733,7 @@ class ISDContentElement {
 
         /* assume the element is a region if it does not have a kind */
 
-        this.kind = ttelem.kind || 'region';
+        this.kind = ttelem.kind || "region";
 
         /* copy lang */
 
@@ -758,13 +758,13 @@ class ISDContentElement {
 
         /* copy src and type if image */
 
-        if ('src' in ttelem) {
+        if ("src" in ttelem) {
 
             this.src = ttelem.src;
 
         }
 
-        if ('type' in ttelem) {
+        if ("type" in ttelem) {
 
             this.type = ttelem.type;
 
@@ -773,16 +773,16 @@ class ISDContentElement {
         /* TODO: clean this!
          * TODO: ISDElement and document element should be better tied together */
 
-        if ('text' in ttelem) {
+        if ("text" in ttelem) {
 
             this.text = ttelem.text;
 
-        } else if (this.kind === 'region' || 'contents' in ttelem) {
+        } else if (this.kind === "region" || "contents" in ttelem) {
 
             this.contents = [];
         }
 
-        if ('space' in ttelem) {
+        if ("space" in ttelem) {
 
             this.space = ttelem.space;
         }
diff --git a/src/main/js/main.js b/src/main/js/main.js
index 02911abb..0a093b7d 100644
--- a/src/main/js/main.js
+++ b/src/main/js/main.js
@@ -24,6 +24,6 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-export { fromXML } from './doc.js';
-export { renderHTML } from './html.js';
-export { generateISD } from './isd.js';
+export { fromXML } from "./doc.js";
+export { renderHTML } from "./html.js";
+export { generateISD } from "./isd.js";
diff --git a/src/main/js/names.js b/src/main/js/names.js
index 2ea18d81..30a245a7 100644
--- a/src/main/js/names.js
+++ b/src/main/js/names.js
@@ -28,11 +28,11 @@
  * @module imscNames
  */
 
-export const ns_tt = 'http://www.w3.org/ns/ttml';
-export const ns_tts = 'http://www.w3.org/ns/ttml#styling';
-export const ns_ttp = 'http://www.w3.org/ns/ttml#parameter';
-export const ns_xml = 'http://www.w3.org/XML/1998/namespace';
-export const ns_itts = 'http://www.w3.org/ns/ttml/profile/imsc1#styling';
-export const ns_ittp = 'http://www.w3.org/ns/ttml/profile/imsc1#parameter';
-export const ns_smpte = 'http://www.smpte-ra.org/schemas/2052-1/2010/smpte-tt';
-export const ns_ebutts = 'urn:ebu:tt:style';
+export const ns_tt = "http://www.w3.org/ns/ttml";
+export const ns_tts = "http://www.w3.org/ns/ttml#styling";
+export const ns_ttp = "http://www.w3.org/ns/ttml#parameter";
+export const ns_xml = "http://www.w3.org/XML/1998/namespace";
+export const ns_itts = "http://www.w3.org/ns/ttml/profile/imsc1#styling";
+export const ns_ittp = "http://www.w3.org/ns/ttml/profile/imsc1#parameter";
+export const ns_smpte = "http://www.smpte-ra.org/schemas/2052-1/2010/smpte-tt";
+export const ns_ebutts = "urn:ebu:tt:style";
diff --git a/src/main/js/styles.js b/src/main/js/styles.js
index 9c806b26..03f02530 100644
--- a/src/main/js/styles.js
+++ b/src/main/js/styles.js
@@ -24,8 +24,8 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-import { ns_ebutts, ns_itts, ns_smpte, ns_tts } from './names.js';
-import { ComputedLength, parseColor, parseFloat, parseInt, parseLength, parsePosition, parseTextShadow, toComputedLength } from './utils.js';
+import { ns_ebutts, ns_itts, ns_smpte, ns_tts } from "./names.js";
+import { ComputedLength, parseColor, parseInt, parseLength, parsePosition, parseTextShadow, toComputedLength } from "./utils.js";
 
 /**
  * @module imscStyles
@@ -35,7 +35,7 @@ class StylingAttributeDefinition {
     constructor(ns, name, initialValue, appliesTo, isInherit, isAnimatable, parseFunc, computeFunc) {
         this.name = name;
         this.ns = ns;
-        this.qname = ns + ' ' + name;
+        this.qname = ns + " " + name;
         this.inherit = isInherit;
         this.animatable = isAnimatable;
         this.initial = initialValue;
@@ -49,9 +49,9 @@ export const all = [
 
     new StylingAttributeDefinition(
         ns_tts,
-        'backgroundColor',
-        'transparent',
-        ['body', 'div', 'p', 'region', 'span'],
+        "backgroundColor",
+        "transparent",
+        ["body", "div", "p", "region", "span"],
         false,
         true,
         parseColor,
@@ -59,9 +59,9 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'color',
-        'white',
-        ['span'],
+        "color",
+        "white",
+        ["span"],
         true,
         true,
         parseColor,
@@ -69,9 +69,9 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'direction',
-        'ltr',
-        ['p', 'span'],
+        "direction",
+        "ltr",
+        ["p", "span"],
         true,
         true,
         function (str) {
@@ -81,9 +81,9 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'display',
-        'auto',
-        ['body', 'div', 'p', 'region', 'span'],
+        "display",
+        "auto",
+        ["body", "div", "p", "region", "span"],
         false,
         true,
         function (str) {
@@ -93,9 +93,9 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'displayAlign',
-        'before',
-        ['region'],
+        "displayAlign",
+        "before",
+        ["region"],
         false,
         true,
         function (str) {
@@ -105,27 +105,27 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'extent',
-        'auto',
-        ['tt', 'region'],
+        "extent",
+        "auto",
+        ["tt", "region"],
         false,
         true,
         function (str) {
 
-            if (str === 'auto') {
+            if (str === "auto") {
 
                 return str;
 
             } else {
 
-                const s = str.split(' ');
+                const s = str.split(" ");
                 if (s.length !== 2)
                     return null;
                 const w = parseLength(s[0]);
                 const h = parseLength(s[1]);
                 if (!h || !w)
                     return null;
-                return { 'h': h, 'w': w };
+                return { "h": h, "w": w };
             }
 
         },
@@ -134,7 +134,7 @@ export const all = [
             let h;
             let w;
 
-            if (attr === 'auto') {
+            if (attr === "auto") {
 
                 h = new ComputedLength(0, 1);
 
@@ -156,7 +156,7 @@ export const all = [
                 }
             }
 
-            if (attr === 'auto') {
+            if (attr === "auto") {
 
                 w = new ComputedLength(1, 0);
 
@@ -179,18 +179,18 @@ export const all = [
 
             }
 
-            return { 'h': h, 'w': w };
+            return { "h": h, "w": w };
         },
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'fontFamily',
-        'default',
-        ['span', 'p'],
+        "fontFamily",
+        "default",
+        ["span", "p"],
         true,
         true,
         function (str) {
-            const ffs = str.split(',');
+            const ffs = str.split(",");
             const rslt = [];
 
             for (let i = 0; i < ffs.length; i++) {
@@ -198,11 +198,11 @@ export const all = [
 
                 if (ffs[i].charAt(0) !== "'" && ffs[i].charAt(0) !== '"') {
 
-                    if (ffs[i] === 'default') {
+                    if (ffs[i] === "default") {
 
                         /* per IMSC1 */
 
-                        rslt.push('monospaceSerif');
+                        rslt.push("monospaceSerif");
 
                     } else {
 
@@ -224,9 +224,9 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'shear',
-        '0%',
-        ['p'],
+        "shear",
+        "0%",
+        ["p"],
         true,
         true,
         parseLength,
@@ -234,7 +234,7 @@ export const all = [
 
             let fs;
 
-            if (attr.unit === '%') {
+            if (attr.unit === "%") {
 
                 fs = Math.abs(attr.value) > 100 ? Math.sign(attr.value) * 100 : attr.value;
 
@@ -249,9 +249,9 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'fontSize',
-        '1c',
-        ['span', 'p'],
+        "fontSize",
+        "1c",
+        ["span", "p"],
         true,
         true,
         parseLength,
@@ -270,9 +270,9 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'fontStyle',
-        'normal',
-        ['span', 'p'],
+        "fontStyle",
+        "normal",
+        ["span", "p"],
         true,
         true,
         function (str) {
@@ -284,9 +284,9 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'fontWeight',
-        'normal',
-        ['span', 'p'],
+        "fontWeight",
+        "normal",
+        ["span", "p"],
         true,
         true,
         function (str) {
@@ -298,13 +298,13 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'lineHeight',
-        'normal',
-        ['p'],
+        "lineHeight",
+        "normal",
+        ["p"],
         true,
         true,
         function (str) {
-            if (str === 'normal') {
+            if (str === "normal") {
                 return str;
             } else {
                 return parseLength(str);
@@ -314,7 +314,7 @@ export const all = [
 
             let lh;
 
-            if (attr === 'normal') {
+            if (attr === "normal") {
 
                 /* inherit normal per https://github.com/w3c/ttml1/issues/220 */
 
@@ -346,9 +346,9 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'opacity',
+        "opacity",
         1.0,
-        ['region'],
+        ["region"],
         false,
         true,
         parseFloat,
@@ -356,27 +356,27 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'origin',
-        'auto',
-        ['region'],
+        "origin",
+        "auto",
+        ["region"],
         false,
         true,
         function (str) {
 
-            if (str === 'auto') {
+            if (str === "auto") {
 
                 return str;
 
             } else {
 
-                const s = str.split(' ');
+                const s = str.split(" ");
                 if (s.length !== 2)
                     return null;
                 const w = parseLength(s[0]);
                 const h = parseLength(s[1]);
                 if (!h || !w)
                     return null;
-                return { 'h': h, 'w': w };
+                return { "h": h, "w": w };
             }
 
         },
@@ -385,7 +385,7 @@ export const all = [
             let h;
             let w;
 
-            if (attr === 'auto') {
+            if (attr === "auto") {
 
                 h = new ComputedLength(0, 0);
 
@@ -408,7 +408,7 @@ export const all = [
 
             }
 
-            if (attr === 'auto') {
+            if (attr === "auto") {
 
                 w = new ComputedLength(0, 0);
 
@@ -431,14 +431,14 @@ export const all = [
 
             }
 
-            return { 'h': h, 'w': w };
+            return { "h": h, "w": w };
         },
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'overflow',
-        'hidden',
-        ['region'],
+        "overflow",
+        "hidden",
+        ["region"],
         false,
         true,
         function (str) {
@@ -448,14 +448,14 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'padding',
-        '0px',
-        ['region'],
+        "padding",
+        "0px",
+        ["region"],
         false,
         true,
         function (str) {
 
-            const s = str.split(' ');
+            const s = str.split(" ");
             if (s.length > 4)
                 return null;
             const r = [];
@@ -513,19 +513,19 @@ export const all = [
 
             const dir = element.styleAttrs[byName.writingMode.qname];
 
-            if (dir === 'lrtb' || dir === 'lr') {
+            if (dir === "lrtb" || dir === "lr") {
 
                 padding = [padding[0], padding[3], padding[2], padding[1]];
 
-            } else if (dir === 'rltb' || dir === 'rl') {
+            } else if (dir === "rltb" || dir === "rl") {
 
                 padding = [padding[0], padding[1], padding[2], padding[3]];
 
-            } else if (dir === 'tblr') {
+            } else if (dir === "tblr") {
 
                 padding = [padding[3], padding[0], padding[1], padding[2]];
 
-            } else if (dir === 'tbrl' || dir === 'tb') {
+            } else if (dir === "tbrl" || dir === "tb") {
 
                 padding = [padding[3], padding[2], padding[1], padding[0]];
 
@@ -564,9 +564,9 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'position',
-        'top left',
-        ['region'],
+        "position",
+        "top left",
+        ["region"],
         false,
         true,
         function (str) {
@@ -592,7 +592,7 @@ export const all = [
 
             if (h === null) return null;
 
-            if (attr.v.edge === 'bottom') {
+            if (attr.v.edge === "bottom") {
 
                 h = new ComputedLength(
                     - h.rw - element.styleAttrs[byName.extent.qname].h.rw,
@@ -615,7 +615,7 @@ export const all = [
 
             if (h === null) return null;
 
-            if (attr.h.edge === 'right') {
+            if (attr.h.edge === "right") {
 
                 w = new ComputedLength(
                     doc.dimensions.w.rw - w.rw - element.styleAttrs[byName.extent.qname].w.rw,
@@ -624,14 +624,14 @@ export const all = [
 
             }
 
-            return { 'h': h, 'w': w };
+            return { "h": h, "w": w };
         },
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'ruby',
-        'none',
-        ['span'],
+        "ruby",
+        "none",
+        ["span"],
         false,
         true,
         function (str) {
@@ -641,14 +641,14 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'rubyAlign',
-        'center',
-        ['span'],
+        "rubyAlign",
+        "center",
+        ["span"],
         true,
         true,
         function (str) {
 
-            if (!(str === 'center' || str === 'spaceAround')) {
+            if (!(str === "center" || str === "spaceAround")) {
                 return null;
             }
 
@@ -658,9 +658,9 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'rubyPosition',
-        'outside',
-        ['span'],
+        "rubyPosition",
+        "outside",
+        ["span"],
         true,
         true,
         function (str) {
@@ -670,24 +670,24 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'rubyReserve',
-        'none',
-        ['p'],
+        "rubyReserve",
+        "none",
+        ["p"],
         true,
         true,
         function (str) {
-            const s = str.split(' ');
+            const s = str.split(" ");
 
             const r = [null, null];
 
             if (s.length === 0 || s.length > 2)
                 return null;
 
-            if (s[0] === 'none' ||
-                s[0] === 'both' ||
-                s[0] === 'after' ||
-                s[0] === 'before' ||
-                s[0] === 'outside') {
+            if (s[0] === "none" ||
+                s[0] === "both" ||
+                s[0] === "after" ||
+                s[0] === "before" ||
+                s[0] === "outside") {
 
                 r[0] = s[0];
 
@@ -697,7 +697,7 @@ export const all = [
 
             }
 
-            if (s.length === 2 && s[0] !== 'none') {
+            if (s.length === 2 && s[0] !== "none") {
 
                 const l = parseLength(s[1]);
 
@@ -717,7 +717,7 @@ export const all = [
         },
         function (doc, parent, element, attr) {
 
-            if (attr[0] === 'none') {
+            if (attr[0] === "none") {
 
                 return attr;
 
@@ -751,9 +751,9 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'showBackground',
-        'always',
-        ['region'],
+        "showBackground",
+        "always",
+        ["region"],
         false,
         true,
         function (str) {
@@ -763,9 +763,9 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'textAlign',
-        'start',
-        ['p'],
+        "textAlign",
+        "start",
+        ["p"],
         true,
         true,
         function (str) {
@@ -774,13 +774,13 @@ export const all = [
         function (doc, parent, element, attr) {
             /* Section 7.16.9 of XSL */
 
-            if (attr === 'left') {
+            if (attr === "left") {
 
-                return 'start';
+                return "start";
 
-            } else if (attr === 'right') {
+            } else if (attr === "right") {
 
-                return 'end';
+                return "end";
 
             } else {
 
@@ -791,13 +791,13 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'textCombine',
-        'none',
-        ['span'],
+        "textCombine",
+        "none",
+        ["span"],
         true,
         true,
         function (str) {
-            if (str === 'none' || str === 'all') {
+            if (str === "none" || str === "all") {
 
                 return str;
             }
@@ -808,50 +808,50 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'textDecoration',
-        'none',
-        ['span'],
+        "textDecoration",
+        "none",
+        ["span"],
         true,
         true,
         function (str) {
-            return str.split(' ');
+            return str.split(" ");
         },
         null,
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'textEmphasis',
-        'none',
-        ['span'],
+        "textEmphasis",
+        "none",
+        ["span"],
         true,
         true,
         function (str) {
-            const e = str.split(' ');
+            const e = str.split(" ");
 
             const rslt = { style: null, symbol: null, color: null, position: null };
 
             for (let i = 0; i < e.length; i++) {
 
-                if (e[i] === 'none' || e[i] === 'auto') {
+                if (e[i] === "none" || e[i] === "auto") {
 
                     rslt.style = e[i];
 
-                } else if (e[i] === 'filled' ||
-                    e[i] === 'open') {
+                } else if (e[i] === "filled" ||
+                    e[i] === "open") {
 
                     rslt.style = e[i];
 
-                } else if (e[i] === 'circle' ||
-                    e[i] === 'dot' ||
-                    e[i] === 'sesame') {
+                } else if (e[i] === "circle" ||
+                    e[i] === "dot" ||
+                    e[i] === "sesame") {
 
                     rslt.symbol = e[i];
 
-                } else if (e[i] === 'current') {
+                } else if (e[i] === "current") {
 
                     rslt.color = e[i];
 
-                } else if (e[i] === 'outside' || e[i] === 'before' || e[i] === 'after') {
+                } else if (e[i] === "outside" || e[i] === "before" || e[i] === "after") {
 
                     rslt.position = e[i];
 
@@ -867,17 +867,17 @@ export const all = [
 
             if (rslt.style == null && rslt.symbol == null) {
 
-                rslt.style = 'auto';
+                rslt.style = "auto";
 
             } else {
 
-                rslt.symbol = rslt.symbol || 'circle';
-                rslt.style = rslt.style || 'filled';
+                rslt.symbol = rslt.symbol || "circle";
+                rslt.style = rslt.style || "filled";
 
             }
 
-            rslt.position = rslt.position || 'outside';
-            rslt.color = rslt.color || 'current';
+            rslt.position = rslt.position || "outside";
+            rslt.color = rslt.color || "current";
 
             return rslt;
         },
@@ -885,9 +885,9 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'textOutline',
-        'none',
-        ['span'],
+        "textOutline",
+        "none",
+        ["span"],
         true,
         true,
         function (str) {
@@ -897,14 +897,14 @@ export const all = [
              *
              */
 
-            if (str === 'none') {
+            if (str === "none") {
 
                 return str;
 
             } else {
 
                 const r = {};
-                const s = str.split(' ');
+                const s = str.split(" ");
                 if (s.length === 0 || s.length > 2)
                     return null;
                 const c = parseColor(s[0]);
@@ -935,7 +935,7 @@ export const all = [
              *
              */
 
-            if (attr === 'none')
+            if (attr === "none")
                 return attr;
 
             const rslt = {};
@@ -967,9 +967,9 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'textShadow',
-        'none',
-        ['span'],
+        "textShadow",
+        "none",
+        ["span"],
         true,
         true,
         parseTextShadow,
@@ -980,7 +980,7 @@ export const all = [
              *
              */
 
-            if (attr === 'none')
+            if (attr === "none")
                 return attr;
 
             const r = [];
@@ -1052,9 +1052,9 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'unicodeBidi',
-        'normal',
-        ['span', 'p'],
+        "unicodeBidi",
+        "normal",
+        ["span", "p"],
         false,
         true,
         function (str) {
@@ -1064,9 +1064,9 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'visibility',
-        'visible',
-        ['body', 'div', 'p', 'region', 'span'],
+        "visibility",
+        "visible",
+        ["body", "div", "p", "region", "span"],
         true,
         true,
         function (str) {
@@ -1076,9 +1076,9 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'wrapOption',
-        'wrap',
-        ['span'],
+        "wrapOption",
+        "wrap",
+        ["span"],
         true,
         true,
         function (str) {
@@ -1088,9 +1088,9 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'writingMode',
-        'lrtb',
-        ['region'],
+        "writingMode",
+        "lrtb",
+        ["region"],
         false,
         true,
         function (str) {
@@ -1100,16 +1100,16 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_tts,
-        'zIndex',
-        'auto',
-        ['region'],
+        "zIndex",
+        "auto",
+        ["region"],
         false,
         true,
         function (str) {
 
             let rslt;
 
-            if (str === 'auto') {
+            if (str === "auto") {
 
                 rslt = str;
 
@@ -1129,9 +1129,9 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_ebutts,
-        'linePadding',
-        '0c',
-        ['p'],
+        "linePadding",
+        "0c",
+        ["p"],
         true,
         false,
         parseLength,
@@ -1143,9 +1143,9 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_ebutts,
-        'multiRowAlign',
-        'auto',
-        ['p'],
+        "multiRowAlign",
+        "auto",
+        ["p"],
         true,
         false,
         function (str) {
@@ -1155,9 +1155,9 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_smpte,
-        'backgroundImage',
+        "backgroundImage",
         null,
-        ['div'],
+        ["div"],
         false,
         false,
         function (str) {
@@ -1167,25 +1167,25 @@ export const all = [
     ),
     new StylingAttributeDefinition(
         ns_itts,
-        'forcedDisplay',
-        'false',
-        ['body', 'div', 'p', 'region', 'span'],
+        "forcedDisplay",
+        "false",
+        ["body", "div", "p", "region", "span"],
         true,
         true,
         function (str) {
-            return str === 'true' ? true : false;
+            return str === "true" ? true : false;
         },
         null,
     ),
     new StylingAttributeDefinition(
         ns_itts,
-        'fillLineGap',
-        'false',
-        ['p'],
+        "fillLineGap",
+        "false",
+        ["p"],
         true,
         true,
         function (str) {
-            return str === 'true' ? true : false;
+            return str === "true" ? true : false;
         },
         null,
     ),
diff --git a/src/main/js/utils.js b/src/main/js/utils.js
index 0c405ff0..5a682f5a 100644
--- a/src/main/js/utils.js
+++ b/src/main/js/utils.js
@@ -137,11 +137,11 @@ export function parseTextShadow(str) {
 
     for (let i = 0; i < shadows.length; i++) {
 
-        const shadow = shadows[i].split(' ');
+        const shadow = shadows[i].split(" ");
 
-        if (shadow.length === 1 && shadow[0] === 'none') {
+        if (shadow.length === 1 && shadow[0] === "none") {
 
-            return 'none';
+            return "none";
 
         } else if (shadow.length > 1 && shadow.length < 5) {
 
@@ -206,15 +206,15 @@ export function parsePosition(str) {
 
     /* see https://www.w3.org/TR/ttml2/#style-value-position */
 
-    const s = str.split(' ');
+    const s = str.split(" ");
 
     const isKeyword = function (str) {
 
-        return str === 'center' ||
-            str === 'left' ||
-            str === 'top' ||
-            str === 'bottom' ||
-            str === 'right';
+        return str === "center" ||
+            str === "left" ||
+            str === "top" ||
+            str === "bottom" ||
+            str === "right";
 
     };
 
@@ -243,8 +243,8 @@ export function parsePosition(str) {
     /* position default */
 
     const pos = {
-        h: { edge: 'left', offset: { value: 50, unit: '%' } },
-        v: { edge: 'top', offset: { value: 50, unit: '%' } },
+        h: { edge: "left", offset: { value: 50, unit: "%" } },
+        v: { edge: "top", offset: { value: 50, unit: "%" } },
     };
 
     /* update position */
@@ -259,7 +259,7 @@ export function parsePosition(str) {
 
             /* we have a keyword */
 
-            let offset = { value: 0, unit: '%' };
+            let offset = { value: 0, unit: "%" };
 
             /* peek at the next component */
 
@@ -273,23 +273,23 @@ export function parsePosition(str) {
 
             /* skip if center */
 
-            if (comp === 'right') {
+            if (comp === "right") {
 
                 pos.h.edge = comp;
 
                 pos.h.offset = offset;
 
-            } else if (comp === 'bottom') {
+            } else if (comp === "bottom") {
 
                 pos.v.edge = comp;
 
                 pos.v.offset = offset;
 
-            } else if (comp === 'left') {
+            } else if (comp === "left") {
 
                 pos.h.offset = offset;
 
-            } else if (comp === 'top') {
+            } else if (comp === "top") {
 
                 pos.v.offset = offset;
 
@@ -356,42 +356,42 @@ export class ComputedLength {
  */
 export function toComputedLength(lengthVal, lengthUnit, emLength, percentLength, cellLength, pxLength) {
 
-    if (lengthUnit === '%' && percentLength) {
+    if (lengthUnit === "%" && percentLength) {
 
         return new ComputedLength(
             percentLength.rw * lengthVal / 100,
             percentLength.rh * lengthVal / 100,
         );
 
-    } else if (lengthUnit === 'em' && emLength) {
+    } else if (lengthUnit === "em" && emLength) {
 
         return new ComputedLength(
             emLength.rw * lengthVal,
             emLength.rh * lengthVal,
         );
 
-    } else if (lengthUnit === 'c' && cellLength) {
+    } else if (lengthUnit === "c" && cellLength) {
 
         return new ComputedLength(
             lengthVal * cellLength.rw,
             lengthVal * cellLength.rh,
         );
 
-    } else if (lengthUnit === 'px' && pxLength) {
+    } else if (lengthUnit === "px" && pxLength) {
 
         return new ComputedLength(
             lengthVal * pxLength.rw,
             lengthVal * pxLength.rh,
         );
 
-    } else if (lengthUnit === 'rh') {
+    } else if (lengthUnit === "rh") {
 
         return new ComputedLength(
             0,
             lengthVal / 100,
         );
 
-    } else if (lengthUnit === 'rw') {
+    } else if (lengthUnit === "rw") {
 
         return new ComputedLength(
             lengthVal / 100,
diff --git a/src/test/js/ParseColor.js b/src/test/js/ParseColor.js
index 4cb6657a..96d56224 100644
--- a/src/test/js/ParseColor.js
+++ b/src/test/js/ParseColor.js
@@ -1,38 +1,38 @@
-import { parseColor } from '../../main/js/utils.js';
+import { parseColor } from "../../main/js/utils.js";
 
-QUnit.test('ParseColor',
+QUnit.test("ParseColor",
     function (assert) {
 
         const tests = [
-            ['#FFFFFF', [255, 255, 255, 255]],
-            ['#FFFFFF7F', [255, 255, 255, 127]],
-            ['rgb(255,128,255)', [255, 128, 255, 255]],
-            ['rgb( 255, 128 ,   255   )', [255, 128, 255, 255]],
-            ['rgba(128,255,255,63)', [128, 255, 255, 63]],
-            ['transparent', [0, 0, 0, 0]],
-            ['black', [0, 0, 0, 255]],
-            ['silver', [0xc0, 0xc0, 0xc0, 255]],
-            ['gray', [0x80, 0x80, 0x80, 255]],
-            ['white', [255, 255, 255, 255]],
-            ['maroon', [0x80, 0, 0, 255]],
-            ['red', [255, 0, 0, 255]],
-            ['purple', [0x80, 0, 0x80, 255]],
-            ['fuchsia', [255, 0, 255, 255]],
-            ['magenta', [255, 0, 255, 255]],
-            ['green', [0, 0x80, 0, 255]],
-            ['lime', [0, 255, 0, 255]],
-            ['olive', [0x80, 0x80, 0, 255]],
-            ['yellow', [255, 255, 0, 255]],
-            ['navy', [0, 0, 0x80, 255]],
-            ['blue', [0, 0, 255, 255]],
-            ['teal', [0, 0x80, 0x80, 255]],
-            ['aqua', [0, 255, 255, 255]],
-            ['cyan', [0, 255, 255, 255]],
-            ['Cyan', [0, 255, 255, 255]],
-            ['CYAN', [0, 255, 255, 255]],
-            ['#FFffFF', [255, 255, 255, 255]],
-            ['#FfFFFF7f', [255, 255, 255, 127]],
-            ['#red', null],
+            ["#FFFFFF", [255, 255, 255, 255]],
+            ["#FFFFFF7F", [255, 255, 255, 127]],
+            ["rgb(255,128,255)", [255, 128, 255, 255]],
+            ["rgb( 255, 128 ,   255   )", [255, 128, 255, 255]],
+            ["rgba(128,255,255,63)", [128, 255, 255, 63]],
+            ["transparent", [0, 0, 0, 0]],
+            ["black", [0, 0, 0, 255]],
+            ["silver", [0xc0, 0xc0, 0xc0, 255]],
+            ["gray", [0x80, 0x80, 0x80, 255]],
+            ["white", [255, 255, 255, 255]],
+            ["maroon", [0x80, 0, 0, 255]],
+            ["red", [255, 0, 0, 255]],
+            ["purple", [0x80, 0, 0x80, 255]],
+            ["fuchsia", [255, 0, 255, 255]],
+            ["magenta", [255, 0, 255, 255]],
+            ["green", [0, 0x80, 0, 255]],
+            ["lime", [0, 255, 0, 255]],
+            ["olive", [0x80, 0x80, 0, 255]],
+            ["yellow", [255, 255, 0, 255]],
+            ["navy", [0, 0, 0x80, 255]],
+            ["blue", [0, 0, 255, 255]],
+            ["teal", [0, 0x80, 0x80, 255]],
+            ["aqua", [0, 255, 255, 255]],
+            ["cyan", [0, 255, 255, 255]],
+            ["Cyan", [0, 255, 255, 255]],
+            ["CYAN", [0, 255, 255, 255]],
+            ["#FFffFF", [255, 255, 255, 255]],
+            ["#FfFFFF7f", [255, 255, 255, 127]],
+            ["#red", null],
         ];
 
         for (const i in tests) {
diff --git a/src/test/js/ParsePositionTest.js b/src/test/js/ParsePositionTest.js
index 7e0a5de5..290c6fea 100644
--- a/src/test/js/ParsePositionTest.js
+++ b/src/test/js/ParsePositionTest.js
@@ -1,6 +1,6 @@
-import { parsePosition } from '../../../main/js/utils.js';
+import { parsePosition } from "../../../main/js/utils.js";
 
-QUnit.test('ParsePosition',
+QUnit.test("ParsePosition",
     function (assert) {
 
         function position(h_edge, h_offval, h_offunit, v_edge, v_offval, v_offunit) {
@@ -14,79 +14,79 @@ QUnit.test('ParsePosition',
 
             /* one component */
 
-            ['center', position('left', 50, '%', 'top', 50, '%')],
-            ['left', position('left', 0, '%', 'top', 50, '%')],
-            ['right', position('right', 0, '%', 'top', 50, '%')],
-            ['top', position('left', 50, '%', 'top', 0, '%')],
-            ['bottom', position('left', 50, '%', 'bottom', 0, '%')],
-            ['25%', position('left', 25, '%', 'top', 50, '%')],
+            ["center", position("left", 50, "%", "top", 50, "%")],
+            ["left", position("left", 0, "%", "top", 50, "%")],
+            ["right", position("right", 0, "%", "top", 50, "%")],
+            ["top", position("left", 50, "%", "top", 0, "%")],
+            ["bottom", position("left", 50, "%", "bottom", 0, "%")],
+            ["25%", position("left", 25, "%", "top", 50, "%")],
 
             /* two components */
 
-            ['bottom center', position('left', 50, '%', 'bottom', 0, '%')],
-            ['bottom left', position('left', 0, '%', 'bottom', 0, '%')],
-            ['bottom right', position('right', 0, '%', 'bottom', 0, '%')],
+            ["bottom center", position("left", 50, "%", "bottom", 0, "%")],
+            ["bottom left", position("left", 0, "%", "bottom", 0, "%")],
+            ["bottom right", position("right", 0, "%", "bottom", 0, "%")],
             /*["bottom 25%", position("left", 0, "%", "top", 50, "%")],*/
-            ['center center', position('left', 50, '%', 'top', 50, '%')],
-            ['center top', position('left', 50, '%', 'top', 0, '%')],
-            ['center bottom', position('left', 50, '%', 'bottom', 0, '%')],
-            ['center left', position('left', 0, '%', 'top', 50, '%')],
-            ['center right', position('right', 0, '%', 'top', 50, '%')],
-            ['center 33%', position('left', 50, '%', 'top', 33, '%')],
-            ['left center', position('left', 0, '%', 'top', 50, '%')],
-            ['left top', position('left', 0, '%', 'top', 0, '%')],
-            ['left bottom', position('left', 0, '%', 'bottom', 0, '%')],
-            ['left 45%', position('left', 0, '%', 'top', 45, '%')],
-            ['right center', position('right', 0, '%', 'top', 50, '%')],
-            ['right top', position('right', 0, '%', 'top', 0, '%')],
-            ['right bottom', position('right', 0, '%', 'bottom', 0, '%')],
-            ['right 20%', position('right', 0, '%', 'top', 20, '%')],
-            ['top center', position('left', 50, '%', 'top', 0, '%')],
-            ['top left', position('left', 0, '%', 'top', 0, '%')],
-            ['top right', position('right', 0, '%', 'top', 0, '%')],
+            ["center center", position("left", 50, "%", "top", 50, "%")],
+            ["center top", position("left", 50, "%", "top", 0, "%")],
+            ["center bottom", position("left", 50, "%", "bottom", 0, "%")],
+            ["center left", position("left", 0, "%", "top", 50, "%")],
+            ["center right", position("right", 0, "%", "top", 50, "%")],
+            ["center 33%", position("left", 50, "%", "top", 33, "%")],
+            ["left center", position("left", 0, "%", "top", 50, "%")],
+            ["left top", position("left", 0, "%", "top", 0, "%")],
+            ["left bottom", position("left", 0, "%", "bottom", 0, "%")],
+            ["left 45%", position("left", 0, "%", "top", 45, "%")],
+            ["right center", position("right", 0, "%", "top", 50, "%")],
+            ["right top", position("right", 0, "%", "top", 0, "%")],
+            ["right bottom", position("right", 0, "%", "bottom", 0, "%")],
+            ["right 20%", position("right", 0, "%", "top", 20, "%")],
+            ["top center", position("left", 50, "%", "top", 0, "%")],
+            ["top left", position("left", 0, "%", "top", 0, "%")],
+            ["top right", position("right", 0, "%", "top", 0, "%")],
             /*["top 75%", position("left", 75, "%", "top", 50, "%")],*/
-            ['75% center', position('left', 75, '%', 'top', 50, '%')],
-            ['75% top', position('left', 75, '%', 'top', 0, '%')],
-            ['75% bottom', position('left', 75, '%', 'bottom', 0, '%')],
-            ['75% 75%', position('left', 75, '%', 'top', 75, '%')],
+            ["75% center", position("left", 75, "%", "top", 50, "%")],
+            ["75% top", position("left", 75, "%", "top", 0, "%")],
+            ["75% bottom", position("left", 75, "%", "bottom", 0, "%")],
+            ["75% 75%", position("left", 75, "%", "top", 75, "%")],
 
             /* three components */
 
-            ['bottom left 1%', position('left', 1, '%', 'bottom', 0, '%')],
-            ['bottom right 2%', position('right', 2, '%', 'bottom', 0, '%')],
-            ['bottom 3% center', position('left', 50, '%', 'bottom', 3, '%')],
-            ['bottom 4% left', position('left', 0, '%', 'bottom', 4, '%')],
-            ['bottom 5% right', position('right', 0, '%', 'bottom', 5, '%')],
-            ['center bottom 6%', position('left', 50, '%', 'bottom', 6, '%')],
-            ['center left 7%', position('left', 7, '%', 'top', 50, '%')],
-            ['center right 8%', position('right', 8, '%', 'top', 50, '%')],
-            ['center top 9%', position('left', 50, '%', 'top', 9, '%')],
-            ['left bottom 10%', position('left', 0, '%', 'bottom', 10, '%')],
-            ['left top 11%', position('left', 0, '%', 'top', 11, '%')],
-            ['left 12% bottom', position('left', 12, '%', 'bottom', 0, '%')],
-            ['left 13% center', position('left', 13, '%', 'top', 50, '%')],
-            ['left 14% top', position('left', 14, '%', 'top', 0, '%')],
-            ['right bottom 15%', position('right', 0, '%', 'bottom', 15, '%')],
-            ['right top 16%', position('right', 0, '%', 'top', 16, '%')],
-            ['right 17% bottom', position('right', 17, '%', 'bottom', 0, '%')],
-            ['right 18% center', position('right', 18, '%', 'top', 50, '%')],
-            ['right 19% top', position('right', 19, '%', 'top', 0, '%')],
-            ['top left 20%', position('left', 20, '%', 'top', 0, '%')],
-            ['top right 21%', position('right', 21, '%', 'top', 0, '%')],
-            ['top 22% center', position('left', 50, '%', 'top', 22, '%')],
-            ['top 23% left', position('left', 0, '%', 'top', 23, '%')],
-            ['top 24% right', position('right', 0, '%', 'top', 24, '%')],
+            ["bottom left 1%", position("left", 1, "%", "bottom", 0, "%")],
+            ["bottom right 2%", position("right", 2, "%", "bottom", 0, "%")],
+            ["bottom 3% center", position("left", 50, "%", "bottom", 3, "%")],
+            ["bottom 4% left", position("left", 0, "%", "bottom", 4, "%")],
+            ["bottom 5% right", position("right", 0, "%", "bottom", 5, "%")],
+            ["center bottom 6%", position("left", 50, "%", "bottom", 6, "%")],
+            ["center left 7%", position("left", 7, "%", "top", 50, "%")],
+            ["center right 8%", position("right", 8, "%", "top", 50, "%")],
+            ["center top 9%", position("left", 50, "%", "top", 9, "%")],
+            ["left bottom 10%", position("left", 0, "%", "bottom", 10, "%")],
+            ["left top 11%", position("left", 0, "%", "top", 11, "%")],
+            ["left 12% bottom", position("left", 12, "%", "bottom", 0, "%")],
+            ["left 13% center", position("left", 13, "%", "top", 50, "%")],
+            ["left 14% top", position("left", 14, "%", "top", 0, "%")],
+            ["right bottom 15%", position("right", 0, "%", "bottom", 15, "%")],
+            ["right top 16%", position("right", 0, "%", "top", 16, "%")],
+            ["right 17% bottom", position("right", 17, "%", "bottom", 0, "%")],
+            ["right 18% center", position("right", 18, "%", "top", 50, "%")],
+            ["right 19% top", position("right", 19, "%", "top", 0, "%")],
+            ["top left 20%", position("left", 20, "%", "top", 0, "%")],
+            ["top right 21%", position("right", 21, "%", "top", 0, "%")],
+            ["top 22% center", position("left", 50, "%", "top", 22, "%")],
+            ["top 23% left", position("left", 0, "%", "top", 23, "%")],
+            ["top 24% right", position("right", 0, "%", "top", 24, "%")],
 
             /* four components */
 
-            ['bottom 25% left 75%', position('left', 75, '%', 'bottom', 25, '%')],
-            ['bottom 25% right 75%', position('right', 75, '%', 'bottom', 25, '%')],
-            ['left 25% bottom 75%', position('left', 25, '%', 'bottom', 75, '%')],
-            ['right 25% bottom 75%', position('right', 25, '%', 'bottom', 75, '%')],
-            ['top 25% left 75%', position('left', 75, '%', 'top', 25, '%')],
-            ['top 25% right 75%', position('right', 75, '%', 'top', 25, '%')],
-            ['left 25% top 75%', position('left', 25, '%', 'top', 75, '%')],
-            ['right 25% top 75%', position('right', 25, '%', 'top', 75, '%')],
+            ["bottom 25% left 75%", position("left", 75, "%", "bottom", 25, "%")],
+            ["bottom 25% right 75%", position("right", 75, "%", "bottom", 25, "%")],
+            ["left 25% bottom 75%", position("left", 25, "%", "bottom", 75, "%")],
+            ["right 25% bottom 75%", position("right", 25, "%", "bottom", 75, "%")],
+            ["top 25% left 75%", position("left", 75, "%", "top", 25, "%")],
+            ["top 25% right 75%", position("right", 75, "%", "top", 25, "%")],
+            ["left 25% top 75%", position("left", 25, "%", "top", 75, "%")],
+            ["right 25% top 75%", position("right", 25, "%", "top", 75, "%")],
         ];
 
         for (const i in tests) {
diff --git a/src/test/js/ParseTextShadowTest.js b/src/test/js/ParseTextShadowTest.js
index 7de625ed..be1236e3 100644
--- a/src/test/js/ParseTextShadowTest.js
+++ b/src/test/js/ParseTextShadowTest.js
@@ -1,6 +1,6 @@
-import { parseTextShadow } from '../../main/js/utils.js';
+import { parseTextShadow } from "../../main/js/utils.js";
 
-QUnit.test('ParseTextShadow',
+QUnit.test("ParseTextShadow",
     function (assert) {
 
         function shadow(ioff_val, ioff_unit, boff_val, boff_unit, blur_val, blur_unit, color) {
@@ -16,8 +16,8 @@ QUnit.test('ParseTextShadow',
 
             /* four components */
 
-            ['10% -20% 5% lime', [shadow(10, '%', -20, '%', 5, '%', [0, 255, 0, 255])]],
-            ['+10% 0% -1% rgba(233,30,99,255)', [shadow(10, '%', 0, '%', -1, '%', [233, 30, 99, 255])]],
+            ["10% -20% 5% lime", [shadow(10, "%", -20, "%", 5, "%", [0, 255, 0, 255])]],
+            ["+10% 0% -1% rgba(233,30,99,255)", [shadow(10, "%", 0, "%", -1, "%", [233, 30, 99, 255])]],
 
         ];
 

From 9f7ada7caaebe4dfb6b7f93912bbeec34e7ed44a Mon Sep 17 00:00:00 2001
From: Casey Occhialini <1508707+littlespex@users.noreply.github.com>
Date: Wed, 1 May 2024 09:31:10 -0700
Subject: [PATCH 09/21] no message

---
 src/main/js/styles.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/js/styles.js b/src/main/js/styles.js
index 03f02530..df523e96 100644
--- a/src/main/js/styles.js
+++ b/src/main/js/styles.js
@@ -25,7 +25,7 @@
  */
 
 import { ns_ebutts, ns_itts, ns_smpte, ns_tts } from "./names.js";
-import { ComputedLength, parseColor, parseInt, parseLength, parsePosition, parseTextShadow, toComputedLength } from "./utils.js";
+import { ComputedLength, parseColor, parseLength, parsePosition, parseTextShadow, toComputedLength } from "./utils.js";
 
 /**
  * @module imscStyles

From b6af94ca2febde1cf0cbb150109ee549d05b81bd Mon Sep 17 00:00:00 2001
From: Casey Occhialini <1508707+littlespex@users.noreply.github.com>
Date: Wed, 1 May 2024 10:03:01 -0700
Subject: [PATCH 10/21] no message

---
 Gruntfile.cjs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Gruntfile.cjs b/Gruntfile.cjs
index 95c0268f..7309c3e0 100644
--- a/Gruntfile.cjs
+++ b/Gruntfile.cjs
@@ -51,7 +51,7 @@ module.exports = function (grunt) {
 
         exec: {
             compile: {
-                cmd: "tsc",
+                cmd: "npx tsc",
             },
 
             lint: {

From bfd573f5b0a08ba6d0db1a9eef63833d1d106850 Mon Sep 17 00:00:00 2001
From: Casey Occhialini <1508707+littlespex@users.noreply.github.com>
Date: Wed, 1 May 2024 12:56:20 -0700
Subject: [PATCH 11/21] feat: Add github action to run CI on every PR

---
 .github/workflows/ci.pr.yml       |  32 ++++++++++
 package.json                      |   5 +-
 test/MetadataCallbacks.test.js    |  67 ++++++++++++++++++++
 test/ParseColor.test.js           |  45 ++++++++++++++
 test/ParseFontFamily.test.js      |  37 +++++++++++
 test/ParseLength.test.js          |  28 +++++++++
 test/ParsePosition.test.js        | 100 ++++++++++++++++++++++++++++++
 test/ParseTextShadow.test.js      |  32 ++++++++++
 test/ParseTimeExpressions.test.js |  19 ++++++
 test/utils/close.js               |   5 ++
 test/utils/getIMSC1Document.js    |  22 +++++++
 11 files changed, 391 insertions(+), 1 deletion(-)
 create mode 100644 .github/workflows/ci.pr.yml
 create mode 100644 test/MetadataCallbacks.test.js
 create mode 100644 test/ParseColor.test.js
 create mode 100644 test/ParseFontFamily.test.js
 create mode 100644 test/ParseLength.test.js
 create mode 100644 test/ParsePosition.test.js
 create mode 100644 test/ParseTextShadow.test.js
 create mode 100644 test/ParseTimeExpressions.test.js
 create mode 100644 test/utils/close.js
 create mode 100644 test/utils/getIMSC1Document.js

diff --git a/.github/workflows/ci.pr.yml b/.github/workflows/ci.pr.yml
new file mode 100644
index 00000000..fa65d1c7
--- /dev/null
+++ b/.github/workflows/ci.pr.yml
@@ -0,0 +1,32 @@
+name: Pull Request CI
+
+on:
+  pull_request:
+
+jobs:
+  pull_request_ci:
+    concurrency:
+      group: ${{ github.ref }}
+      cancel-in-progress: true
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: 'npm'
+
+      - name: Install
+        run: npm ci
+
+      - name: Lint
+        run: npm run lint
+
+      - name: Build
+        run: npm run build
+
+      - name: Test
+        run: npm test
diff --git a/package.json b/package.json
index e4367127..8ec1fa56 100644
--- a/package.json
+++ b/package.json
@@ -31,7 +31,10 @@
     "scripts": {
         "prepublishOnly": "grunt build:release",
         "dev": "npx http-server build/public_html",
-        "fix": "eslint --fix src"
+        "lint": "eslint .",
+        "fix": "eslint --fix src",
+        "build": "grunt build",
+        "test": "node --test ./test/*.test.js"
     },
     "dependencies": {
         "sax": "1.2.1"
diff --git a/test/MetadataCallbacks.test.js b/test/MetadataCallbacks.test.js
new file mode 100644
index 00000000..cd43f442
--- /dev/null
+++ b/test/MetadataCallbacks.test.js
@@ -0,0 +1,67 @@
+import { equal, ok } from "node:assert";
+import { test } from "node:test";
+import { getIMSC1Document } from "./utils/getIMSC1Document.js";
+
+test("Metadata Callbacks", async () => {
+
+  let count = 0;
+  let cur_tag = 0;
+  let accumul_txt = "";
+
+  const mh = {
+    onOpenTag: function (ns, name, attrs) {
+
+      switch (count) {
+        case 0:
+          equal(name, "title");
+          equal(ns, "http://www.w3.org/ns/ttml#metadata");
+          cur_tag = 1;
+          break;
+        case 3:
+          equal(name, "conformsToStandard");
+          equal(ns, "urn:ebu:metadata");
+          cur_tag = 2;
+          break;
+        case 4:
+          equal(name, "image");
+          equal(ns, "http://www.smpte-ra.org/schemas/2052-1/2010/smpte-tt");
+          equal(attrs["http://www.w3.org/XML/1998/namespace id"].value, "img_1");
+          equal(attrs[" imagetype"].value, "PNG");
+          cur_tag = 3;
+          break;
+      }
+
+      count++;
+
+    },
+
+    onCloseTag: function () {
+
+      switch (cur_tag) {
+        case 4: {
+          const trimmed_text = accumul_txt.trim();
+          ok(trimmed_text.startswith("iVBORw0KGgoAAAANS"));
+          equal(trimmed_text.length, 4146);
+        }
+      }
+
+      cur_tag = 0;
+      accumul_txt = "";
+    },
+
+    onText: function (contents) {
+      switch (cur_tag) {
+        case 1:
+          equal(contents, "Metadata Handler Test");
+          break;
+        case 2:
+          equal(contents, "http://www.w3.org/ns/ttml/profile/imsc1/text");
+          break;
+        case 4:
+          accumul_txt = accumul_txt + contents;
+      }
+    },
+  };
+
+  await getIMSC1Document("./src/test/resources/unit-tests/metadataHandler.ttml", mh);
+});
diff --git a/test/ParseColor.test.js b/test/ParseColor.test.js
new file mode 100644
index 00000000..aaabb7e6
--- /dev/null
+++ b/test/ParseColor.test.js
@@ -0,0 +1,45 @@
+import { deepEqual } from "node:assert";
+import { test } from "node:test";
+import { parseColor } from "../src/main/js/utils.js";
+
+test("ParseColor", () => {
+    const tests = [
+        ["#FFFFFF", [255, 255, 255, 255]],
+        ["#FFFFFF7F", [255, 255, 255, 127]],
+        ["rgb(255,128,255)", [255, 128, 255, 255]],
+        ["rgb( 255, 128 ,   255   )", [255, 128, 255, 255]],
+        ["rgba(128,255,255,63)", [128, 255, 255, 63]],
+        ["transparent", [0, 0, 0, 0]],
+        ["black", [0, 0, 0, 255]],
+        ["silver", [0xc0, 0xc0, 0xc0, 255]],
+        ["gray", [0x80, 0x80, 0x80, 255]],
+        ["white", [255, 255, 255, 255]],
+        ["maroon", [0x80, 0, 0, 255]],
+        ["red", [255, 0, 0, 255]],
+        ["purple", [0x80, 0, 0x80, 255]],
+        ["fuchsia", [255, 0, 255, 255]],
+        ["magenta", [255, 0, 255, 255]],
+        ["green", [0, 0x80, 0, 255]],
+        ["lime", [0, 255, 0, 255]],
+        ["olive", [0x80, 0x80, 0, 255]],
+        ["yellow", [255, 255, 0, 255]],
+        ["navy", [0, 0, 0x80, 255]],
+        ["blue", [0, 0, 255, 255]],
+        ["teal", [0, 0x80, 0x80, 255]],
+        ["aqua", [0, 255, 255, 255]],
+        ["cyan", [0, 255, 255, 255]],
+        ["Cyan", [0, 255, 255, 255]],
+        ["CYAN", [0, 255, 255, 255]],
+        ["#FFffFF", [255, 255, 255, 255]],
+        ["#FfFFFF7f", [255, 255, 255, 127]],
+        ["#red", null],
+    ];
+
+    for (const i in tests) {
+        deepEqual(
+            parseColor(tests[i][0]),
+            tests[i][1],
+            tests[i][0],
+        );
+    }
+});
diff --git a/test/ParseFontFamily.test.js b/test/ParseFontFamily.test.js
new file mode 100644
index 00000000..30ad6e2c
--- /dev/null
+++ b/test/ParseFontFamily.test.js
@@ -0,0 +1,37 @@
+import { deepEqual } from "node:assert";
+import { test } from "node:test";
+import { getIMSC1Document } from "./utils/getIMSC1Document.js";
+
+test("Font Family Parsing", async () => {
+  const doc = await getIMSC1Document("./src/test/resources/unit-tests/fontFamily.ttml");
+
+  deepEqual(
+    doc.body.contents[0].contents[0].styleAttrs["http://www.w3.org/ns/ttml#styling fontFamily"],
+    ["monospaceSerif"],
+    "Maps 'default' generic family name to 'monospaceSerif' correctly.",
+  );
+
+  deepEqual(
+    doc.body.contents[0].contents[1].styleAttrs["http://www.w3.org/ns/ttml#styling fontFamily"],
+    ["Arial", "monospaceSerif"],
+    "Maps 'default' value used as a fallback to 'monospaceSerif' correctly.",
+  );
+
+  deepEqual(
+    doc.body.contents[0].contents[2].styleAttrs["http://www.w3.org/ns/ttml#styling fontFamily"],
+    ["Arial", "monospaceSerif"],
+    "Maps 'default' value used as a fallback with spacing characters to 'monospaceSerif' correctly.",
+  );
+
+  deepEqual(
+    doc.body.contents[0].contents[3].styleAttrs["http://www.w3.org/ns/ttml#styling fontFamily"],
+    ["'My Test Font'", "monospaceSerif"],
+    "Fonts names wrapped in '' are preserved.",
+  );
+
+  deepEqual(
+    doc.body.contents[0].contents[4].styleAttrs["http://www.w3.org/ns/ttml#styling fontFamily"],
+    ['"My Test Font"', "monospaceSerif"],
+    'Fonts names wrapped in "" are preserved.',
+  );
+});
diff --git a/test/ParseLength.test.js b/test/ParseLength.test.js
new file mode 100644
index 00000000..6c784320
--- /dev/null
+++ b/test/ParseLength.test.js
@@ -0,0 +1,28 @@
+import { deepEqual } from "node:assert";
+import { test } from "node:test";
+import { getIMSC1Document } from "./utils/getIMSC1Document.js";
+
+test("Parse Length Expressions", async () => {
+  const doc = await getIMSC1Document("./src/test/resources/unit-tests/lengthExpressions.ttml");
+
+  deepEqual(
+    doc.body.contents[0].contents[0].styleAttrs["http://www.w3.org/ns/ttml#styling fontSize"],
+    { "unit": "%", "value": 10.5 },
+  );
+
+  deepEqual(
+    doc.body.contents[0].contents[1].styleAttrs["http://www.w3.org/ns/ttml#styling fontSize"],
+    { "unit": "em", "value": 0.105 },
+  );
+
+  deepEqual(
+    doc.body.contents[0].contents[2].styleAttrs["http://www.w3.org/ns/ttml#styling fontSize"],
+    { "unit": "px", "value": 10.5 },
+  );
+
+  deepEqual(
+    doc.body.contents[0].contents[3].styleAttrs["http://www.w3.org/ns/ttml#styling fontSize"],
+    { "unit": "c", "value": 0.105 },
+  );
+
+});
diff --git a/test/ParsePosition.test.js b/test/ParsePosition.test.js
new file mode 100644
index 00000000..1fe32147
--- /dev/null
+++ b/test/ParsePosition.test.js
@@ -0,0 +1,100 @@
+import { deepEqual } from "node:assert";
+import { test } from "node:test";
+import { parsePosition } from "../src/main/js/utils.js";
+
+test("ParsePosition", () => {
+
+    function position(h_edge, h_offval, h_offunit, v_edge, v_offval, v_offunit) {
+        return {
+            h: { edge: h_edge, offset: { value: h_offval, unit: h_offunit } },
+            v: { edge: v_edge, offset: { value: v_offval, unit: v_offunit } },
+        };
+    }
+
+    const tests = [
+
+        /* one component */
+
+        ["center", position("left", 50, "%", "top", 50, "%")],
+        ["left", position("left", 0, "%", "top", 50, "%")],
+        ["right", position("right", 0, "%", "top", 50, "%")],
+        ["top", position("left", 50, "%", "top", 0, "%")],
+        ["bottom", position("left", 50, "%", "bottom", 0, "%")],
+        ["25%", position("left", 25, "%", "top", 50, "%")],
+
+        /* two components */
+
+        ["bottom center", position("left", 50, "%", "bottom", 0, "%")],
+        ["bottom left", position("left", 0, "%", "bottom", 0, "%")],
+        ["bottom right", position("right", 0, "%", "bottom", 0, "%")],
+        /*["bottom 25%", position("left", 0, "%", "top", 50, "%")],*/
+        ["center center", position("left", 50, "%", "top", 50, "%")],
+        ["center top", position("left", 50, "%", "top", 0, "%")],
+        ["center bottom", position("left", 50, "%", "bottom", 0, "%")],
+        ["center left", position("left", 0, "%", "top", 50, "%")],
+        ["center right", position("right", 0, "%", "top", 50, "%")],
+        ["center 33%", position("left", 50, "%", "top", 33, "%")],
+        ["left center", position("left", 0, "%", "top", 50, "%")],
+        ["left top", position("left", 0, "%", "top", 0, "%")],
+        ["left bottom", position("left", 0, "%", "bottom", 0, "%")],
+        ["left 45%", position("left", 0, "%", "top", 45, "%")],
+        ["right center", position("right", 0, "%", "top", 50, "%")],
+        ["right top", position("right", 0, "%", "top", 0, "%")],
+        ["right bottom", position("right", 0, "%", "bottom", 0, "%")],
+        ["right 20%", position("right", 0, "%", "top", 20, "%")],
+        ["top center", position("left", 50, "%", "top", 0, "%")],
+        ["top left", position("left", 0, "%", "top", 0, "%")],
+        ["top right", position("right", 0, "%", "top", 0, "%")],
+        /*["top 75%", position("left", 75, "%", "top", 50, "%")],*/
+        ["75% center", position("left", 75, "%", "top", 50, "%")],
+        ["75% top", position("left", 75, "%", "top", 0, "%")],
+        ["75% bottom", position("left", 75, "%", "bottom", 0, "%")],
+        ["75% 75%", position("left", 75, "%", "top", 75, "%")],
+
+        /* three components */
+
+        ["bottom left 1%", position("left", 1, "%", "bottom", 0, "%")],
+        ["bottom right 2%", position("right", 2, "%", "bottom", 0, "%")],
+        ["bottom 3% center", position("left", 50, "%", "bottom", 3, "%")],
+        ["bottom 4% left", position("left", 0, "%", "bottom", 4, "%")],
+        ["bottom 5% right", position("right", 0, "%", "bottom", 5, "%")],
+        ["center bottom 6%", position("left", 50, "%", "bottom", 6, "%")],
+        ["center left 7%", position("left", 7, "%", "top", 50, "%")],
+        ["center right 8%", position("right", 8, "%", "top", 50, "%")],
+        ["center top 9%", position("left", 50, "%", "top", 9, "%")],
+        ["left bottom 10%", position("left", 0, "%", "bottom", 10, "%")],
+        ["left top 11%", position("left", 0, "%", "top", 11, "%")],
+        ["left 12% bottom", position("left", 12, "%", "bottom", 0, "%")],
+        ["left 13% center", position("left", 13, "%", "top", 50, "%")],
+        ["left 14% top", position("left", 14, "%", "top", 0, "%")],
+        ["right bottom 15%", position("right", 0, "%", "bottom", 15, "%")],
+        ["right top 16%", position("right", 0, "%", "top", 16, "%")],
+        ["right 17% bottom", position("right", 17, "%", "bottom", 0, "%")],
+        ["right 18% center", position("right", 18, "%", "top", 50, "%")],
+        ["right 19% top", position("right", 19, "%", "top", 0, "%")],
+        ["top left 20%", position("left", 20, "%", "top", 0, "%")],
+        ["top right 21%", position("right", 21, "%", "top", 0, "%")],
+        ["top 22% center", position("left", 50, "%", "top", 22, "%")],
+        ["top 23% left", position("left", 0, "%", "top", 23, "%")],
+        ["top 24% right", position("right", 0, "%", "top", 24, "%")],
+
+        /* four components */
+
+        ["bottom 25% left 75%", position("left", 75, "%", "bottom", 25, "%")],
+        ["bottom 25% right 75%", position("right", 75, "%", "bottom", 25, "%")],
+        ["left 25% bottom 75%", position("left", 25, "%", "bottom", 75, "%")],
+        ["right 25% bottom 75%", position("right", 25, "%", "bottom", 75, "%")],
+        ["top 25% left 75%", position("left", 75, "%", "top", 25, "%")],
+        ["top 25% right 75%", position("right", 75, "%", "top", 25, "%")],
+        ["left 25% top 75%", position("left", 25, "%", "top", 75, "%")],
+        ["right 25% top 75%", position("right", 25, "%", "top", 75, "%")],
+    ];
+
+    for (const i in tests) {
+        deepEqual(
+            parsePosition(tests[i][0]),
+            tests[i][1],
+            tests[i][0],
+        );
+    }
+});
diff --git a/test/ParseTextShadow.test.js b/test/ParseTextShadow.test.js
new file mode 100644
index 00000000..d676bcaf
--- /dev/null
+++ b/test/ParseTextShadow.test.js
@@ -0,0 +1,32 @@
+import { deepEqual } from "node:assert";
+import { test } from "node:test";
+import { parseTextShadow } from "../src/main/js/utils.js";
+
+test("ParseTextShadow", () => {
+
+    function shadow(ioff_val, ioff_unit, boff_val, boff_unit, blur_val, blur_unit, color) {
+        return [
+            { value: ioff_val, unit: ioff_unit },
+            { value: boff_val, unit: boff_unit },
+            { value: blur_val, unit: blur_unit },
+            color,
+        ]
+    }
+
+    const tests = [
+
+        /* four components */
+
+        ["10% -20% 5% lime", [shadow(10, "%", -20, "%", 5, "%", [0, 255, 0, 255])]],
+        ["+10% 0% -1% rgba(233,30,99,255)", [shadow(10, "%", 0, "%", -1, "%", [233, 30, 99, 255])]],
+
+    ];
+
+    for (const i in tests) {
+        deepEqual(
+            parseTextShadow(tests[i][0]),
+            tests[i][1],
+            tests[i][0],
+        );
+    }
+});
diff --git a/test/ParseTimeExpressions.test.js b/test/ParseTimeExpressions.test.js
new file mode 100644
index 00000000..e205d24d
--- /dev/null
+++ b/test/ParseTimeExpressions.test.js
@@ -0,0 +1,19 @@
+
+import { test } from "node:test";
+import { close } from "./utils/close.js";
+import { getIMSC1Document } from "./utils/getIMSC1Document.js";
+
+test("Parse Time Expressions", async () => {
+  const doc = await getIMSC1Document("./src/test/resources/unit-tests/timeExpressions.ttml");
+  close(doc.body.contents[0].contents[0].begin, 1.2, 1e-10);
+  close(doc.body.contents[0].contents[1].begin, 72, 1e-10);
+  close(doc.body.contents[0].contents[2].begin, 4320, 1e-10);
+  close(doc.body.contents[0].contents[3].begin, 24 / 24000 * 1001, 1e-10);
+  close(doc.body.contents[0].contents[4].begin, 2, 1e-10);
+  close(doc.body.contents[0].contents[5].begin, 3723, 1e-10);
+  close(doc.body.contents[0].contents[6].begin, 3723.235, 1e-10);
+  close(doc.body.contents[0].contents[7].begin, 3723.235, 1e-10);
+  close(doc.body.contents[0].contents[8].begin, 3600 + 2 * 60 + 3 + 20 / 24000 * 1001, 1e-10);
+  close(doc.body.contents[0].contents[9].begin, 360000.1, 1e-10);
+  close(doc.body.contents[0].contents[10].begin, 360000 + 100 / 24000 * 1001, 1e-10);
+});
diff --git a/test/utils/close.js b/test/utils/close.js
new file mode 100644
index 00000000..017a86bb
--- /dev/null
+++ b/test/utils/close.js
@@ -0,0 +1,5 @@
+import assert from "node:assert";
+
+export function close(actual, expected, delta) {
+  assert(Math.abs(actual - expected) <= delta, `${actual} is not close to ${expected}`);
+}
diff --git a/test/utils/getIMSC1Document.js b/test/utils/getIMSC1Document.js
new file mode 100644
index 00000000..278560bc
--- /dev/null
+++ b/test/utils/getIMSC1Document.js
@@ -0,0 +1,22 @@
+import fs from "node:fs/promises";
+import { fromXML } from "../../src/main/js/doc.js";
+
+const errorHandler = {
+  info: function (msg) {
+    throw msg;
+  },
+  warn: function (msg) {
+    throw msg;
+  },
+  error: function (msg) {
+    throw msg;
+  },
+  fatal: function (msg) {
+    throw msg;
+  },
+};
+
+export async function getIMSC1Document(url, metadataHandler) {
+  const contents = await fs.readFile(url, "utf8");
+  return fromXML(contents, errorHandler, metadataHandler);
+}

From cfd3cd9e64f9246e31dc9cc8adbe05b45a10b33c Mon Sep 17 00:00:00 2001
From: Casey Occhialini <1508707+littlespex@users.noreply.github.com>
Date: Wed, 1 May 2024 13:06:17 -0700
Subject: [PATCH 12/21] no message

---
 Gruntfile.cjs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Gruntfile.cjs b/Gruntfile.cjs
index 7309c3e0..0a1bbffc 100644
--- a/Gruntfile.cjs
+++ b/Gruntfile.cjs
@@ -55,7 +55,7 @@ module.exports = function (grunt) {
             },
 
             lint: {
-                cmd: "npx eslint src",
+                cmd: "npx eslint .",
             },
 
             bundle: {

From 600b38b9d620a5d1c3dcf7f195bc054f2aeaee9b Mon Sep 17 00:00:00 2001
From: Casey Occhialini <1508707+littlespex@users.noreply.github.com>
Date: Wed, 1 May 2024 14:05:09 -0700
Subject: [PATCH 13/21] chore: remove unused dependencies and resources

---
 Gruntfile.cjs                                 |    2 -
 package-lock.json                             | 2618 +----------------
 package.json                                  |    3 -
 src/test/js/ParseColor.js                     |   46 -
 src/test/js/ParsePositionTest.js              |  100 -
 src/test/js/ParseTextShadowTest.js            |   32 -
 src/test/webapp/gen-renders.html              |   51 +-
 src/test/webapp/js/unit-tests.js              |  212 --
 src/test/webapp/unit_tests.html               |   19 -
 test/MetadataCallbacks.test.js                |    2 +-
 test/ParseFontFamily.test.js                  |    2 +-
 test/ParseLength.test.js                      |    2 +-
 test/ParseTimeExpressions.test.js             |    2 +-
 .../resources}/fontFamily.ttml                |    0
 .../resources}/lengthExpressions.ttml         |    0
 .../resources}/metadataHandler.ttml           |    0
 .../resources}/timeExpressions.ttml           |    0
 17 files changed, 125 insertions(+), 2966 deletions(-)
 delete mode 100644 src/test/js/ParseColor.js
 delete mode 100644 src/test/js/ParsePositionTest.js
 delete mode 100644 src/test/js/ParseTextShadowTest.js
 delete mode 100644 src/test/webapp/js/unit-tests.js
 delete mode 100644 src/test/webapp/unit_tests.html
 rename {src/test/resources/unit-tests => test/resources}/fontFamily.ttml (100%)
 rename {src/test/resources/unit-tests => test/resources}/lengthExpressions.ttml (100%)
 rename {src/test/resources/unit-tests => test/resources}/metadataHandler.ttml (100%)
 rename {src/test/resources/unit-tests => test/resources}/timeExpressions.ttml (100%)

diff --git a/Gruntfile.cjs b/Gruntfile.cjs
index 0a1bbffc..1d4a45fd 100644
--- a/Gruntfile.cjs
+++ b/Gruntfile.cjs
@@ -40,8 +40,6 @@ module.exports = function (grunt) {
                 files: {
                     "<%= properties.webappBuildDir %>/libs/": [
                         "sax:main",
-                        "qunit-assert-close:main",
-                        "qunitjs:main",
                         "filesaver.js-npm:main",
                         "jszip/dist/jszip.js",
                     ],
diff --git a/package-lock.json b/package-lock.json
index 3c8605cc..be702943 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -25,9 +25,6 @@
                 "grunt-npmcopy": "latest",
                 "grunt-sync": "latest",
                 "jszip": "latest",
-                "node-qunit": "^1.0.0",
-                "qunit-assert-close": "latest",
-                "qunitjs": "latest",
                 "rollup": "^4.14.3",
                 "rollup-plugin-polyfill-node": "^0.13.0",
                 "tslib": "^2.6.2",
@@ -632,16 +629,6 @@
                 "url": "https://github.com/sponsors/epoberezkin"
             }
         },
-        "node_modules/amdefine": {
-            "version": "1.0.1",
-            "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
-            "integrity": "sha512-S2Hw0TtNkMJhIabBwIojKL9YHO5T0n5eNqWJ7Lrlel/zDbftQpxpapi8tZs3X1HWa+u+QeydGmzzNU0m09+Rcg==",
-            "dev": true,
-            "optional": true,
-            "engines": {
-                "node": ">=0.4.2"
-            }
-        },
         "node_modules/ansi-regex": {
             "version": "5.0.1",
             "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
@@ -666,132 +653,12 @@
                 "url": "https://github.com/chalk/ansi-styles?sponsor=1"
             }
         },
-        "node_modules/anymatch": {
-            "version": "1.3.2",
-            "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-1.3.2.tgz",
-            "integrity": "sha512-0XNayC8lTHQ2OI8aljNCN3sSx6hsr/1+rlcDAotXJR7C1oZZHCNsfpbKwMjRA3Uqb5tF1Rae2oloTr4xpq+WjA==",
-            "dev": true,
-            "dependencies": {
-                "micromatch": "^2.1.5",
-                "normalize-path": "^2.0.0"
-            }
-        },
-        "node_modules/anymatch/node_modules/braces": {
-            "version": "1.8.5",
-            "resolved": "https://registry.npmjs.org/braces/-/braces-1.8.5.tgz",
-            "integrity": "sha512-xU7bpz2ytJl1bH9cgIurjpg/n8Gohy9GTw81heDYLJQ4RU60dlyJsa+atVF2pI0yMMvKxI9HkKwjePCj5XI1hw==",
-            "dev": true,
-            "dependencies": {
-                "expand-range": "^1.8.1",
-                "preserve": "^0.2.0",
-                "repeat-element": "^1.1.2"
-            },
-            "engines": {
-                "node": ">=0.10.0"
-            }
-        },
-        "node_modules/anymatch/node_modules/is-extglob": {
-            "version": "1.0.0",
-            "resolved": "https://registry.npmjs.org/is-extglob/-/is-extglob-1.0.0.tgz",
-            "integrity": "sha512-7Q+VbVafe6x2T+Tu6NcOf6sRklazEPmBoB3IWk3WdGZM2iGUwU/Oe3Wtq5lSEkDTTlpp8yx+5t4pzO/i9Ty1ww==",
-            "dev": true,
-            "engines": {
-                "node": ">=0.10.0"
-            }
-        },
-        "node_modules/anymatch/node_modules/is-glob": {
-            "version": "2.0.1",
-            "resolved": "https://registry.npmjs.org/is-glob/-/is-glob-2.0.1.tgz",
-            "integrity": "sha512-a1dBeB19NXsf/E0+FHqkagizel/LQw2DjSQpvQrj3zT+jYPpaUCryPnrQajXKFLCMuf4I6FhRpaGtw4lPrG6Eg==",
-            "dev": true,
-            "dependencies": {
-                "is-extglob": "^1.0.0"
-            },
-            "engines": {
-                "node": ">=0.10.0"
-            }
-        },
-        "node_modules/anymatch/node_modules/kind-of": {
-            "version": "3.2.2",
-            "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-3.2.2.tgz",
-            "integrity": "sha512-NOW9QQXMoZGg/oqnVNoNTTIFEIid1627WCffUBJEdMxYApq7mNE7CpzucIPc+ZQg25Phej7IJSmX3hO+oblOtQ==",
-            "dev": true,
-            "dependencies": {
-                "is-buffer": "^1.1.5"
-            },
-            "engines": {
-                "node": ">=0.10.0"
-            }
-        },
-        "node_modules/anymatch/node_modules/micromatch": {
-            "version": "2.3.11",
-            "resolved": "https://registry.npmjs.org/micromatch/-/micromatch-2.3.11.tgz",
-            "integrity": "sha512-LnU2XFEk9xxSJ6rfgAry/ty5qwUTyHYOBU0g4R6tIw5ljwgGIBmiKhRWLw5NpMOnrgUNcDJ4WMp8rl3sYVHLNA==",
-            "dev": true,
-            "dependencies": {
-                "arr-diff": "^2.0.0",
-                "array-unique": "^0.2.1",
-                "braces": "^1.8.2",
-                "expand-brackets": "^0.1.4",
-                "extglob": "^0.3.1",
-                "filename-regex": "^2.0.0",
-                "is-extglob": "^1.0.0",
-                "is-glob": "^2.0.1",
-                "kind-of": "^3.0.2",
-                "normalize-path": "^2.0.1",
-                "object.omit": "^2.0.0",
-                "parse-glob": "^3.0.4",
-                "regex-cache": "^0.4.2"
-            },
-            "engines": {
-                "node": ">=0.10.0"
-            }
-        },
         "node_modules/argparse": {
             "version": "2.0.1",
             "resolved": "https://registry.npmjs.org/argparse/-/argparse-2.0.1.tgz",
             "integrity": "sha512-8+9WqebbFzpX9OR+Wa6O29asIogeRMzcGtAINdpMHHyAg10f05aSFVBbcEqGf/PXw1EjAZ+q2/bEBg3DvurK3Q==",
             "dev": true
         },
-        "node_modules/argsparser": {
-            "version": "0.0.7",
-            "resolved": "https://registry.npmjs.org/argsparser/-/argsparser-0.0.7.tgz",
-            "integrity": "sha512-jWiKKi8EwhvFhtyY+2x5Y4zOa2Wp93mhQ++0MxcLF/SJNlmf5kro81o/3juM9iQOa6pE/poHAGKl5vP7Cbn8Dg==",
-            "dev": true,
-            "engines": {
-                "node": ">= 0.2.0"
-            }
-        },
-        "node_modules/arr-diff": {
-            "version": "2.0.0",
-            "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-2.0.0.tgz",
-            "integrity": "sha512-dtXTVMkh6VkEEA7OhXnN1Ecb8aAGFdZ1LFxtOCoqj4qkyOJMt7+qs6Ahdy6p/NQCPYsRSXXivhSB/J5E9jmYKA==",
-            "dev": true,
-            "dependencies": {
-                "arr-flatten": "^1.0.1"
-            },
-            "engines": {
-                "node": ">=0.10.0"
-            }
-        },
-        "node_modules/arr-flatten": {
-            "version": "1.1.0",
-            "resolved": "https://registry.npmjs.org/arr-flatten/-/arr-flatten-1.1.0.tgz",
-            "integrity": "sha512-L3hKV5R/p5o81R7O02IGnwpDmkp6E982XhtbuwSe3O4qOtMMMtodicASA1Cny2U+aCXcNpml+m4dPsvsJ3jatg==",
-            "dev": true,
-            "engines": {
-                "node": ">=0.10.0"
-            }
-        },
-        "node_modules/arr-union": {
-            "version": "3.1.0",
-            "resolved": "https://registry.npmjs.org/arr-union/-/arr-union-3.1.0.tgz",
-            "integrity": "sha512-sKpyeERZ02v1FeCZT8lrfJq5u6goHCtpTAzPwJYe7c8SPFOboNjNg1vz2L4VTn9T4PQxEx13TbXLmYUcS6Ug7Q==",
-            "dev": true,
-            "engines": {
-                "node": ">=0.10.0"
-            }
-        },
         "node_modules/array-each": {
             "version": "1.0.1",
             "resolved": "https://registry.npmjs.org/array-each/-/array-each-1.0.1.tgz",
@@ -810,109 +677,18 @@
                 "node": ">=0.10.0"
             }
         },
-        "node_modules/array-unique": {
-            "version": "0.2.1",
-            "resolved": "https://registry.npmjs.org/array-unique/-/array-unique-0.2.1.tgz",
-            "integrity": "sha512-G2n5bG5fSUCpnsXz4+8FUkYsGPkNfLn9YvS66U5qbTIXI2Ynnlo4Bi42bWv+omKUCqz+ejzfClwne0alJWJPhg==",
-            "dev": true,
-            "engines": {
-                "node": ">=0.10.0"
-            }
-        },
-        "node_modules/assign-symbols": {
-            "version": "1.0.0",
-            "resolved": "https://registry.npmjs.org/assign-symbols/-/assign-symbols-1.0.0.tgz",
-            "integrity": "sha512-Q+JC7Whu8HhmTdBph/Tq59IoRtoy6KAm5zzPv00WdujX82lbAL8K7WVjne7vdCsAmbF4AYaDOPyO3k0kl8qIrw==",
-            "dev": true,
-            "engines": {
-                "node": ">=0.10.0"
-            }
-        },
         "node_modules/async": {
             "version": "3.2.5",
             "resolved": "https://registry.npmjs.org/async/-/async-3.2.5.tgz",
             "integrity": "sha512-baNZyqaaLhyLVKm/DlvdW051MSgO6b8eVfIezl9E5PqWxFgzLm/wQntEW4zOytVburDEr0JlALEpdOFwvErLsg==",
             "dev": true
         },
-        "node_modules/async-each": {
-            "version": "1.0.6",
-            "resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.6.tgz",
-            "integrity": "sha512-c646jH1avxr+aVpndVMeAfYw7wAa6idufrlN3LPA4PmKS0QEGp6PIC9nwz0WQkkvBGAMEki3pFdtxaF39J9vvg==",
-            "dev": true,
-            "funding": [
-                {
-                    "type": "individual",
-                    "url": "https://paulmillr.com/funding/"
-                }
-            ]
-        },
-        "node_modules/atob": {
-            "version": "2.1.2",
-            "resolved": "https://registry.npmjs.org/atob/-/atob-2.1.2.tgz",
-            "integrity": "sha512-Wm6ukoaOGJi/73p/cl2GvLjTI5JM1k/O14isD73YML8StrH/7/lRFgmg8nICZgD3bZZvjwCGxtMOD3wWNAu8cg==",
-            "dev": true,
-            "bin": {
-                "atob": "bin/atob.js"
-            },
-            "engines": {
-                "node": ">= 4.5.0"
-            }
-        },
         "node_modules/balanced-match": {
             "version": "1.0.2",
             "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
             "integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==",
             "dev": true
         },
-        "node_modules/base": {
-            "version": "0.11.2",
-            "resolved": "https://registry.npmjs.org/base/-/base-0.11.2.tgz",
-            "integrity": "sha512-5T6P4xPgpp0YDFvSWwEZ4NoE3aM4QBQXDzmVbraCkFj8zHM+mba8SyqB5DbZWyR7mYHo6Y7BdQo3MoA4m0TeQg==",
-            "dev": true,
-            "dependencies": {
-                "cache-base": "^1.0.1",
-                "class-utils": "^0.3.5",
-                "component-emitter": "^1.2.1",
-                "define-property": "^1.0.0",
-                "isobject": "^3.0.1",
-                "mixin-deep": "^1.2.0",
-                "pascalcase": "^0.1.1"
-            },
-            "engines": {
-                "node": ">=0.10.0"
-            }
-        },
-        "node_modules/base/node_modules/define-property": {
-            "version": "1.0.0",
-            "resolved": "https://registry.npmjs.org/define-property/-/define-property-1.0.0.tgz",
-            "integrity": "sha512-cZTYKFWspt9jZsMscWo8sc/5lbPC9Q0N5nBLgb+Yd915iL3udB1uFgS3B8YCx66UVHq018DAVFoee7x+gxggeA==",
-            "dev": true,
-            "dependencies": {
-                "is-descriptor": "^1.0.0"
-            },
-            "engines": {
-                "node": ">=0.10.0"
-            }
-        },
-        "node_modules/binary-extensions": {
-            "version": "1.13.1",
-            "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-1.13.1.tgz",
-            "integrity": "sha512-Un7MIEDdUC5gNpcGDV97op1Ywk748MpHcFTHoYs6qnj1Z3j7I53VG3nwZhKzoBZmbdRNnb6WRdFlwl7tSDuZGw==",
-            "dev": true,
-            "engines": {
-                "node": ">=0.10.0"
-            }
-        },
-        "node_modules/bindings": {
-            "version": "1.5.0",
-            "resolved": "https://registry.npmjs.org/bindings/-/bindings-1.5.0.tgz",
-            "integrity": "sha512-p2q/t/mhvuOj/UeLlV6566GD/guowlr0hHxClI0W9m7MWYkL1F0hLo+0Aexs9HSPCtR1SXQ0TD3MMKrXZajbiQ==",
-            "dev": true,
-            "optional": true,
-            "dependencies": {
-                "file-uri-to-path": "1.0.0"
-            }
-        },
         "node_modules/brace-expansion": {
             "version": "1.1.11",
             "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
@@ -953,26 +729,6 @@
                 "url": "https://github.com/sponsors/sindresorhus"
             }
         },
-        "node_modules/cache-base": {
-            "version": "1.0.1",
-            "resolved": "https://registry.npmjs.org/cache-base/-/cache-base-1.0.1.tgz",
-            "integrity": "sha512-AKcdTnFSWATd5/GCPRxr2ChwIJ85CeyrEyjRHlKxQ56d4XJMGym0uAiKn0xbLOGOl3+yRpOTi484dVCEc5AUzQ==",
-            "dev": true,
-            "dependencies": {
-                "collection-visit": "^1.0.0",
-                "component-emitter": "^1.2.1",
-                "get-value": "^2.0.6",
-                "has-value": "^1.0.0",
-                "isobject": "^3.0.1",
-                "set-value": "^2.0.0",
-                "to-object-path": "^0.3.0",
-                "union-value": "^1.0.0",
-                "unset-value": "^1.0.0"
-            },
-            "engines": {
-                "node": ">=0.10.0"
-            }
-        },
         "node_modules/callsites": {
             "version": "3.1.0",
             "resolved": "https://registry.npmjs.org/callsites/-/callsites-3.1.0.tgz",
@@ -998,140 +754,6 @@
                 "url": "https://github.com/chalk/chalk?sponsor=1"
             }
         },
-        "node_modules/chokidar": {
-            "version": "1.6.1",
-            "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-1.6.1.tgz",
-            "integrity": "sha512-/6SIsjBGK5mzf1i1L8ccsH0jZuzWvMump0iJ6LD3jYxhwiLjvJ+5GrpJNxay9MGRvTAoYmzLU/z19wyxEjfv1w==",
-            "deprecated": "Chokidar 2 will break on node v14+. Upgrade to chokidar 3 with 15x less dependencies.",
-            "dev": true,
-            "dependencies": {
-                "anymatch": "^1.3.0",
-                "async-each": "^1.0.0",
-                "glob-parent": "^2.0.0",
-                "inherits": "^2.0.1",
-                "is-binary-path": "^1.0.0",
-                "is-glob": "^2.0.0",
-                "path-is-absolute": "^1.0.0",
-                "readdirp": "^2.0.0"
-            },
-            "optionalDependencies": {
-                "fsevents": "^1.0.0"
-            }
-        },
-        "node_modules/chokidar/node_modules/glob-parent": {
-            "version": "2.0.0",
-            "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-2.0.0.tgz",
-            "integrity": "sha512-JDYOvfxio/t42HKdxkAYaCiBN7oYiuxykOxKxdaUW5Qn0zaYN3gRQWolrwdnf0shM9/EP0ebuuTmyoXNr1cC5w==",
-            "dev": true,
-            "dependencies": {
-                "is-glob": "^2.0.0"
-            }
-        },
-        "node_modules/chokidar/node_modules/is-extglob": {
-            "version": "1.0.0",
-            "resolved": "https://registry.npmjs.org/is-extglob/-/is-extglob-1.0.0.tgz",
-            "integrity": "sha512-7Q+VbVafe6x2T+Tu6NcOf6sRklazEPmBoB3IWk3WdGZM2iGUwU/Oe3Wtq5lSEkDTTlpp8yx+5t4pzO/i9Ty1ww==",
-            "dev": true,
-            "engines": {
-                "node": ">=0.10.0"
-            }
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-        "node_modules/unset-value/node_modules/has-values": {
-            "version": "0.1.4",
-            "resolved": "https://registry.npmjs.org/has-values/-/has-values-0.1.4.tgz",
-            "integrity": "sha512-J8S0cEdWuQbqD9//tlZxiMuMNmxB8PlEwvYwuxsTmR1G5RXUePEX/SJn7aD0GMLieuZYSwNH0cQuJGwnYunXRQ==",
-            "dev": true,
-            "engines": {
-                "node": ">=0.10.0"
-            }
-        },
         "node_modules/uri-js": {
             "version": "4.4.1",
             "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz",
@@ -5276,22 +2883,6 @@
                 "punycode": "^2.1.0"
             }
         },
-        "node_modules/urix": {
-            "version": "0.1.0",
-            "resolved": "https://registry.npmjs.org/urix/-/urix-0.1.0.tgz",
-            "integrity": "sha512-Am1ousAhSLBeB9cG/7k7r2R0zj50uDRlZHPGbazid5s9rlF1F/QKYObEKSIunSjIOkJZqwRRLpvewjEkM7pSqg==",
-            "deprecated": "Please see https://github.com/lydell/urix#deprecated",
-            "dev": true
-        },
-        "node_modules/use": {
-            "version": "3.1.1",
-            "resolved": "https://registry.npmjs.org/use/-/use-3.1.1.tgz",
-            "integrity": "sha512-cwESVXlO3url9YWlFW/TA9cshCEhtu7IKJ/p5soJ/gGpj7vbvFrAY/eIioQ6Dw23KjZhYgiIo8HOs1nQ2vr/oQ==",
-            "dev": true,
-            "engines": {
-                "node": ">=0.10.0"
-            }
-        },
         "node_modules/util-deprecate": {
             "version": "1.0.2",
             "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
@@ -5310,16 +2901,6 @@
                 "node": ">= 0.10"
             }
         },
-        "node_modules/walk-sync": {
-            "version": "0.3.1",
-            "resolved": "https://registry.npmjs.org/walk-sync/-/walk-sync-0.3.1.tgz",
-            "integrity": "sha512-WRHxHjRh4AR0MhPqafaWwemTl8ooNWkI/v/724d+kn0NvN+KjsDZTgwXRlsV/Hfg+mtF9bz1MhNgeqq54JuFTg==",
-            "dev": true,
-            "dependencies": {
-                "ensure-posix-path": "^1.0.0",
-                "matcher-collection": "^1.0.0"
-            }
-        },
         "node_modules/which": {
             "version": "2.0.2",
             "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -5344,13 +2925,6 @@
                 "node": ">=0.10.0"
             }
         },
-        "node_modules/wordwrap": {
-            "version": "1.0.0",
-            "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
-            "integrity": "sha512-gvVzJFlPycKc5dZN4yPkP8w7Dc37BtP1yczEneOb4uq34pXZcvrtRTmWV8W+Ume+XCxKgbjM+nevkyFPMybd4Q==",
-            "dev": true,
-            "optional": true
-        },
         "node_modules/wrappy": {
             "version": "1.0.2",
             "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
diff --git a/package.json b/package.json
index 8ec1fa56..d6b459ed 100644
--- a/package.json
+++ b/package.json
@@ -53,9 +53,6 @@
         "grunt-npmcopy": "latest",
         "grunt-sync": "latest",
         "jszip": "latest",
-        "node-qunit": "^1.0.0",
-        "qunit-assert-close": "latest",
-        "qunitjs": "latest",
         "rollup": "^4.14.3",
         "rollup-plugin-polyfill-node": "^0.13.0",
         "tslib": "^2.6.2",
diff --git a/src/test/js/ParseColor.js b/src/test/js/ParseColor.js
deleted file mode 100644
index 96d56224..00000000
--- a/src/test/js/ParseColor.js
+++ /dev/null
@@ -1,46 +0,0 @@
-import { parseColor } from "../../main/js/utils.js";
-
-QUnit.test("ParseColor",
-    function (assert) {
-
-        const tests = [
-            ["#FFFFFF", [255, 255, 255, 255]],
-            ["#FFFFFF7F", [255, 255, 255, 127]],
-            ["rgb(255,128,255)", [255, 128, 255, 255]],
-            ["rgb( 255, 128 ,   255   )", [255, 128, 255, 255]],
-            ["rgba(128,255,255,63)", [128, 255, 255, 63]],
-            ["transparent", [0, 0, 0, 0]],
-            ["black", [0, 0, 0, 255]],
-            ["silver", [0xc0, 0xc0, 0xc0, 255]],
-            ["gray", [0x80, 0x80, 0x80, 255]],
-            ["white", [255, 255, 255, 255]],
-            ["maroon", [0x80, 0, 0, 255]],
-            ["red", [255, 0, 0, 255]],
-            ["purple", [0x80, 0, 0x80, 255]],
-            ["fuchsia", [255, 0, 255, 255]],
-            ["magenta", [255, 0, 255, 255]],
-            ["green", [0, 0x80, 0, 255]],
-            ["lime", [0, 255, 0, 255]],
-            ["olive", [0x80, 0x80, 0, 255]],
-            ["yellow", [255, 255, 0, 255]],
-            ["navy", [0, 0, 0x80, 255]],
-            ["blue", [0, 0, 255, 255]],
-            ["teal", [0, 0x80, 0x80, 255]],
-            ["aqua", [0, 255, 255, 255]],
-            ["cyan", [0, 255, 255, 255]],
-            ["Cyan", [0, 255, 255, 255]],
-            ["CYAN", [0, 255, 255, 255]],
-            ["#FFffFF", [255, 255, 255, 255]],
-            ["#FfFFFF7f", [255, 255, 255, 127]],
-            ["#red", null],
-        ];
-
-        for (const i in tests) {
-            assert.deepEqual(
-                parseColor(tests[i][0]),
-                tests[i][1],
-                tests[i][0],
-            );
-        }
-    },
-);
diff --git a/src/test/js/ParsePositionTest.js b/src/test/js/ParsePositionTest.js
deleted file mode 100644
index 290c6fea..00000000
--- a/src/test/js/ParsePositionTest.js
+++ /dev/null
@@ -1,100 +0,0 @@
-import { parsePosition } from "../../../main/js/utils.js";
-
-QUnit.test("ParsePosition",
-    function (assert) {
-
-        function position(h_edge, h_offval, h_offunit, v_edge, v_offval, v_offunit) {
-            return {
-                h: { edge: h_edge, offset: { value: h_offval, unit: h_offunit } },
-                v: { edge: v_edge, offset: { value: v_offval, unit: v_offunit } },
-            };
-        }
-
-        tests = [
-
-            /* one component */
-
-            ["center", position("left", 50, "%", "top", 50, "%")],
-            ["left", position("left", 0, "%", "top", 50, "%")],
-            ["right", position("right", 0, "%", "top", 50, "%")],
-            ["top", position("left", 50, "%", "top", 0, "%")],
-            ["bottom", position("left", 50, "%", "bottom", 0, "%")],
-            ["25%", position("left", 25, "%", "top", 50, "%")],
-
-            /* two components */
-
-            ["bottom center", position("left", 50, "%", "bottom", 0, "%")],
-            ["bottom left", position("left", 0, "%", "bottom", 0, "%")],
-            ["bottom right", position("right", 0, "%", "bottom", 0, "%")],
-            /*["bottom 25%", position("left", 0, "%", "top", 50, "%")],*/
-            ["center center", position("left", 50, "%", "top", 50, "%")],
-            ["center top", position("left", 50, "%", "top", 0, "%")],
-            ["center bottom", position("left", 50, "%", "bottom", 0, "%")],
-            ["center left", position("left", 0, "%", "top", 50, "%")],
-            ["center right", position("right", 0, "%", "top", 50, "%")],
-            ["center 33%", position("left", 50, "%", "top", 33, "%")],
-            ["left center", position("left", 0, "%", "top", 50, "%")],
-            ["left top", position("left", 0, "%", "top", 0, "%")],
-            ["left bottom", position("left", 0, "%", "bottom", 0, "%")],
-            ["left 45%", position("left", 0, "%", "top", 45, "%")],
-            ["right center", position("right", 0, "%", "top", 50, "%")],
-            ["right top", position("right", 0, "%", "top", 0, "%")],
-            ["right bottom", position("right", 0, "%", "bottom", 0, "%")],
-            ["right 20%", position("right", 0, "%", "top", 20, "%")],
-            ["top center", position("left", 50, "%", "top", 0, "%")],
-            ["top left", position("left", 0, "%", "top", 0, "%")],
-            ["top right", position("right", 0, "%", "top", 0, "%")],
-            /*["top 75%", position("left", 75, "%", "top", 50, "%")],*/
-            ["75% center", position("left", 75, "%", "top", 50, "%")],
-            ["75% top", position("left", 75, "%", "top", 0, "%")],
-            ["75% bottom", position("left", 75, "%", "bottom", 0, "%")],
-            ["75% 75%", position("left", 75, "%", "top", 75, "%")],
-
-            /* three components */
-
-            ["bottom left 1%", position("left", 1, "%", "bottom", 0, "%")],
-            ["bottom right 2%", position("right", 2, "%", "bottom", 0, "%")],
-            ["bottom 3% center", position("left", 50, "%", "bottom", 3, "%")],
-            ["bottom 4% left", position("left", 0, "%", "bottom", 4, "%")],
-            ["bottom 5% right", position("right", 0, "%", "bottom", 5, "%")],
-            ["center bottom 6%", position("left", 50, "%", "bottom", 6, "%")],
-            ["center left 7%", position("left", 7, "%", "top", 50, "%")],
-            ["center right 8%", position("right", 8, "%", "top", 50, "%")],
-            ["center top 9%", position("left", 50, "%", "top", 9, "%")],
-            ["left bottom 10%", position("left", 0, "%", "bottom", 10, "%")],
-            ["left top 11%", position("left", 0, "%", "top", 11, "%")],
-            ["left 12% bottom", position("left", 12, "%", "bottom", 0, "%")],
-            ["left 13% center", position("left", 13, "%", "top", 50, "%")],
-            ["left 14% top", position("left", 14, "%", "top", 0, "%")],
-            ["right bottom 15%", position("right", 0, "%", "bottom", 15, "%")],
-            ["right top 16%", position("right", 0, "%", "top", 16, "%")],
-            ["right 17% bottom", position("right", 17, "%", "bottom", 0, "%")],
-            ["right 18% center", position("right", 18, "%", "top", 50, "%")],
-            ["right 19% top", position("right", 19, "%", "top", 0, "%")],
-            ["top left 20%", position("left", 20, "%", "top", 0, "%")],
-            ["top right 21%", position("right", 21, "%", "top", 0, "%")],
-            ["top 22% center", position("left", 50, "%", "top", 22, "%")],
-            ["top 23% left", position("left", 0, "%", "top", 23, "%")],
-            ["top 24% right", position("right", 0, "%", "top", 24, "%")],
-
-            /* four components */
-
-            ["bottom 25% left 75%", position("left", 75, "%", "bottom", 25, "%")],
-            ["bottom 25% right 75%", position("right", 75, "%", "bottom", 25, "%")],
-            ["left 25% bottom 75%", position("left", 25, "%", "bottom", 75, "%")],
-            ["right 25% bottom 75%", position("right", 25, "%", "bottom", 75, "%")],
-            ["top 25% left 75%", position("left", 75, "%", "top", 25, "%")],
-            ["top 25% right 75%", position("right", 75, "%", "top", 25, "%")],
-            ["left 25% top 75%", position("left", 25, "%", "top", 75, "%")],
-            ["right 25% top 75%", position("right", 25, "%", "top", 75, "%")],
-        ];
-
-        for (const i in tests) {
-            assert.deepEqual(
-                parsePosition(tests[i][0]),
-                tests[i][1],
-                tests[i][0],
-            );
-        }
-    },
-);
diff --git a/src/test/js/ParseTextShadowTest.js b/src/test/js/ParseTextShadowTest.js
deleted file mode 100644
index be1236e3..00000000
--- a/src/test/js/ParseTextShadowTest.js
+++ /dev/null
@@ -1,32 +0,0 @@
-import { parseTextShadow } from "../../main/js/utils.js";
-
-QUnit.test("ParseTextShadow",
-    function (assert) {
-
-        function shadow(ioff_val, ioff_unit, boff_val, boff_unit, blur_val, blur_unit, color) {
-            return [
-                { value: ioff_val, unit: ioff_unit },
-                { value: boff_val, unit: boff_unit },
-                { value: blur_val, unit: blur_unit },
-                color,
-            ]
-        }
-
-        tests = [
-
-            /* four components */
-
-            ["10% -20% 5% lime", [shadow(10, "%", -20, "%", 5, "%", [0, 255, 0, 255])]],
-            ["+10% 0% -1% rgba(233,30,99,255)", [shadow(10, "%", 0, "%", -1, "%", [233, 30, 99, 255])]],
-
-        ];
-
-        for (const i in tests) {
-            assert.deepEqual(
-                parseTextShadow(tests[i][0]),
-                tests[i][1],
-                tests[i][0],
-            );
-        }
-    },
-);
diff --git a/src/test/webapp/gen-renders.html b/src/test/webapp/gen-renders.html
index 26e9cd81..68726056 100644
--- a/src/test/webapp/gen-renders.html
+++ b/src/test/webapp/gen-renders.html
@@ -1,37 +1,36 @@
 <!doctype html>
 <html lang="en-us">
-    <head>
-        <meta charset="utf-8">
-        <title>Reference Render Generation</title>
 
-        <link rel="stylesheet" href="css/gen-renders.css">
+<head>
+    <meta charset="utf-8">
+    <title>Reference Render Generation</title>
 
-        <link rel="stylesheet" href="https://ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/themes/smoothness/jquery-ui.css">
-        <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.1/jquery.min.js"></script>
-        <script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js"></script>
-        
-         <script src="libs/FileSaver.js"></script>
-        <script src="libs/jszip.js"></script>
-        <script src="libs/sax.js"></script>
-        <script src="libs/imsc.js"></script>
-        <script src="js/reffiles.js"></script>
-        <script src="js/gen-renders.js"></script>
+    <link rel="stylesheet" href="css/gen-renders.css">
 
-    </head>
-    <body>
-        <div id="main">
+    <script src="libs/FileSaver.js"></script>
+    <script src="libs/jszip.js"></script>
+    <script src="libs/sax.js"></script>
+    <script src="libs/imsc.js"></script>
+    <script src="js/reffiles.js"></script>
+    <script src="js/gen-renders.js"></script>
 
-            <section id="start">
-                <button id="start-rendering" onclick="generateRenders('imsc-tests/imsc1')">Generate IMSC 1 reference renders</button>
-                <button id="start-rendering" onclick="generateRenders('imsc-tests/imsc1_1')">Generate IMSC 1.1 reference renders</button>
-            </section>
+</head>
 
+<body>
+    <div id="main">
 
-            <section id="visual">
-                <div id="render-div"></div>
-            </section>
+        <section id="start">
+            <button id="start-rendering" onclick="generateRenders('imsc-tests/imsc1')">Generate IMSC 1 reference
+                renders</button>
+            <button id="start-rendering" onclick="generateRenders('imsc-tests/imsc1_1')">Generate IMSC 1.1 reference
+                renders</button>
+        </section>
 
+        <section id="visual">
+            <div id="render-div"></div>
+        </section>
+
+    </div>
+</body>
 
-        </div>
-    </body>
 </html>
diff --git a/src/test/webapp/js/unit-tests.js b/src/test/webapp/js/unit-tests.js
deleted file mode 100644
index 0f50d4ae..00000000
--- a/src/test/webapp/js/unit-tests.js
+++ /dev/null
@@ -1,212 +0,0 @@
-/* 
- * Copyright (c) 2016, Pierre-Anthony Lemieux <pal@sandflow.com>
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * * Redistributions of source code must retain the above copyright notice, this
- *   list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copyright notice,
- *   this list of conditions and the following disclaimer in the documentation
- *   and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- */
-
-var errorHandler = {
-    info: function (msg) {
-        throw msg;
-    },
-    warn: function (msg) {
-        throw msg;
-    },
-    error: function (msg) {
-        throw msg;
-    },
-    fatal: function (msg) {
-        throw msg;
-    }
-};
-
-function getIMSC1Document(url, metadataHandler) {
-    return new asyncLoadFile(url).then(function (contents) {
-        return imsc.fromXML(contents, errorHandler, metadataHandler);
-    });
-}
-
-QUnit.test(
-    "Parse Time Expressions",
-    function (assert) {
-
-        return getIMSC1Document("unit-tests/timeExpressions.ttml").then(
-            function (doc) {
-
-                assert.close(doc.body.contents[0].contents[0].begin, 1.2, 1e-10);
-                assert.close(doc.body.contents[0].contents[1].begin, 72, 1e-10);
-                assert.close(doc.body.contents[0].contents[2].begin, 4320, 1e-10);
-                assert.close(doc.body.contents[0].contents[3].begin, 24 / 24000 * 1001, 1e-10);
-                assert.close(doc.body.contents[0].contents[4].begin, 2, 1e-10);
-                assert.close(doc.body.contents[0].contents[5].begin, 3723, 1e-10);
-                assert.close(doc.body.contents[0].contents[6].begin, 3723.235, 1e-10);
-                assert.close(doc.body.contents[0].contents[7].begin, 3723.235, 1e-10);
-                assert.close(doc.body.contents[0].contents[8].begin, 3600 + 2 * 60 + 3 + 20 / 24000 * 1001, 1e-10);
-                assert.close(doc.body.contents[0].contents[9].begin, 360000.1, 1e-10);
-                assert.close(doc.body.contents[0].contents[10].begin, 360000 + 100 / 24000 * 1001, 1e-10);
-            }
-        );
-
-    }
-);
-
-QUnit.test(
-    "Parse Length Expressions",
-    function (assert) {
-
-        return getIMSC1Document("unit-tests/lengthExpressions.ttml").then(
-            function (doc) {
-
-                assert.deepEqual(
-                    doc.body.contents[0].contents[0].styleAttrs["http://www.w3.org/ns/ttml#styling fontSize"],
-                    {"unit": "%", "value": 10.5}
-                );
-
-                assert.deepEqual(
-                    doc.body.contents[0].contents[1].styleAttrs["http://www.w3.org/ns/ttml#styling fontSize"],
-                    {"unit": "em", "value": 0.105}
-                );
-
-                assert.deepEqual(
-                    doc.body.contents[0].contents[2].styleAttrs["http://www.w3.org/ns/ttml#styling fontSize"],
-                    {"unit": "px", "value": 10.5}
-                );
-
-                assert.deepEqual(
-                    doc.body.contents[0].contents[3].styleAttrs["http://www.w3.org/ns/ttml#styling fontSize"],
-                    {"unit": "c", "value": 0.105}
-                );
-
-            }
-        );
-
-    }
-);
-
-QUnit.test(
-    "Metadata Callbacks",
-    function (assert) {
-
-        var count = 0;
-        var cur_tag = 0;
-        var accumul_txt = "";
-
-        mh = {
-            onOpenTag: function (ns, name, attrs) {
-
-                switch (count) {
-                    case 0:
-                        assert.equal(name, "title");
-                        assert.equal(ns, "http://www.w3.org/ns/ttml#metadata");
-                        cur_tag = 1;
-                        break;
-                    case 3:
-                        assert.equal(name, "conformsToStandard");
-                        assert.equal(ns, "urn:ebu:metadata");
-                        cur_tag = 2;
-                        break;
-                    case 4:
-                        assert.equal(name, "image");
-                        assert.equal(ns, "http://www.smpte-ra.org/schemas/2052-1/2010/smpte-tt");
-                        assert.equal(attrs["http://www.w3.org/XML/1998/namespace id"].value, "img_1");
-                        assert.equal(attrs[" imagetype"].value, "PNG");
-                        cur_tag = 3;
-                        break;
-                }
-
-                count++;
-
-            },
-
-            onCloseTag: function () {
-                
-                switch (cur_tag) {
-                    case 4:
-                        var trimmed_text = accumul_txt.trim();
-                        assert.ok(trimmed_text.startswith("iVBORw0KGgoAAAANS"));
-                        assert.equal(trimmed_text.length, 4146);
-                }
-                
-                cur_tag = 0;
-                accumul_txt = "";
-            },
-
-            onText: function (contents) {
-                switch (cur_tag) {
-                    case 1:
-                        assert.equal(contents, "Metadata Handler Test");
-                        break;
-                    case 2:
-                        assert.equal(contents, "http://www.w3.org/ns/ttml/profile/imsc1/text");
-                        break;
-                    case 4:
-                        accumul_txt = accumul_txt + contents;
-                }
-            }
-        };
-
-        return getIMSC1Document("unit-tests/metadataHandler.ttml", mh);
-
-    }
-);
-
-QUnit.test(
-    "Font Family Parsing",
-    function (assert) {
-
-        return getIMSC1Document("unit-tests/fontFamily.ttml").then(
-            function (doc) {
-
-                assert.deepEqual(
-                    doc.body.contents[0].contents[0].styleAttrs["http://www.w3.org/ns/ttml#styling fontFamily"],
-                    ["monospaceSerif"],
-                    "Maps 'default' generic family name to 'monospaceSerif' correctly."
-                );
-
-                assert.deepEqual(
-                    doc.body.contents[0].contents[1].styleAttrs["http://www.w3.org/ns/ttml#styling fontFamily"],
-                    ["Arial", "monospaceSerif"],
-                    "Maps 'default' value used as a fallback to 'monospaceSerif' correctly."
-                );
-
-                assert.deepEqual(
-                    doc.body.contents[0].contents[2].styleAttrs["http://www.w3.org/ns/ttml#styling fontFamily"],
-                    ["Arial", "monospaceSerif"],
-                    "Maps 'default' value used as a fallback with spacing characters to 'monospaceSerif' correctly."
-                );
-
-                assert.deepEqual(
-                    doc.body.contents[0].contents[3].styleAttrs["http://www.w3.org/ns/ttml#styling fontFamily"],
-                    ["'My Test Font'", "monospaceSerif"],
-                    "Fonts names wrapped in '' are preserved."
-                );
-
-                assert.deepEqual(
-                    doc.body.contents[0].contents[4].styleAttrs["http://www.w3.org/ns/ttml#styling fontFamily"],
-                    ['"My Test Font"', "monospaceSerif"],
-                    'Fonts names wrapped in "" are preserved.'
-                );
-            }
-        );
-
-    }
-);
diff --git a/src/test/webapp/unit_tests.html b/src/test/webapp/unit_tests.html
deleted file mode 100644
index 265eafac..00000000
--- a/src/test/webapp/unit_tests.html
+++ /dev/null
@@ -1,19 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-  <meta charset="utf-8">
-  <meta name="viewport" content="width=device-width">
-  <title>Unit Tests</title>
-  <link rel="stylesheet" href="https://code.jquery.com/qunit/qunit-2.0.1.css">
-</head>
-<body>
-  <div id="qunit"></div>
-  <div id="qunit-fixture"></div>
-  <script src="libs/sax.js"></script>
-  <script src="libs/qunit.js"></script>
-  <script src="libs/qunit-assert-close.js"></script>
-  <script src="libs/imsc.js"></script>
-  <script src="js/reffiles.js"></script>
-  <script src="js/unit-tests.js"></script>
-</body>
-</html>
\ No newline at end of file
diff --git a/test/MetadataCallbacks.test.js b/test/MetadataCallbacks.test.js
index cd43f442..562d5862 100644
--- a/test/MetadataCallbacks.test.js
+++ b/test/MetadataCallbacks.test.js
@@ -63,5 +63,5 @@ test("Metadata Callbacks", async () => {
     },
   };
 
-  await getIMSC1Document("./src/test/resources/unit-tests/metadataHandler.ttml", mh);
+  await getIMSC1Document("./test/resources/metadataHandler.ttml", mh);
 });
diff --git a/test/ParseFontFamily.test.js b/test/ParseFontFamily.test.js
index 30ad6e2c..b959feaa 100644
--- a/test/ParseFontFamily.test.js
+++ b/test/ParseFontFamily.test.js
@@ -3,7 +3,7 @@ import { test } from "node:test";
 import { getIMSC1Document } from "./utils/getIMSC1Document.js";
 
 test("Font Family Parsing", async () => {
-  const doc = await getIMSC1Document("./src/test/resources/unit-tests/fontFamily.ttml");
+  const doc = await getIMSC1Document("./test/resources/fontFamily.ttml");
 
   deepEqual(
     doc.body.contents[0].contents[0].styleAttrs["http://www.w3.org/ns/ttml#styling fontFamily"],
diff --git a/test/ParseLength.test.js b/test/ParseLength.test.js
index 6c784320..492ea34b 100644
--- a/test/ParseLength.test.js
+++ b/test/ParseLength.test.js
@@ -3,7 +3,7 @@ import { test } from "node:test";
 import { getIMSC1Document } from "./utils/getIMSC1Document.js";
 
 test("Parse Length Expressions", async () => {
-  const doc = await getIMSC1Document("./src/test/resources/unit-tests/lengthExpressions.ttml");
+  const doc = await getIMSC1Document("./test/resources/lengthExpressions.ttml");
 
   deepEqual(
     doc.body.contents[0].contents[0].styleAttrs["http://www.w3.org/ns/ttml#styling fontSize"],
diff --git a/test/ParseTimeExpressions.test.js b/test/ParseTimeExpressions.test.js
index e205d24d..77355c1e 100644
--- a/test/ParseTimeExpressions.test.js
+++ b/test/ParseTimeExpressions.test.js
@@ -4,7 +4,7 @@ import { close } from "./utils/close.js";
 import { getIMSC1Document } from "./utils/getIMSC1Document.js";
 
 test("Parse Time Expressions", async () => {
-  const doc = await getIMSC1Document("./src/test/resources/unit-tests/timeExpressions.ttml");
+  const doc = await getIMSC1Document("./test/resources/timeExpressions.ttml");
   close(doc.body.contents[0].contents[0].begin, 1.2, 1e-10);
   close(doc.body.contents[0].contents[1].begin, 72, 1e-10);
   close(doc.body.contents[0].contents[2].begin, 4320, 1e-10);
diff --git a/src/test/resources/unit-tests/fontFamily.ttml b/test/resources/fontFamily.ttml
similarity index 100%
rename from src/test/resources/unit-tests/fontFamily.ttml
rename to test/resources/fontFamily.ttml
diff --git a/src/test/resources/unit-tests/lengthExpressions.ttml b/test/resources/lengthExpressions.ttml
similarity index 100%
rename from src/test/resources/unit-tests/lengthExpressions.ttml
rename to test/resources/lengthExpressions.ttml
diff --git a/src/test/resources/unit-tests/metadataHandler.ttml b/test/resources/metadataHandler.ttml
similarity index 100%
rename from src/test/resources/unit-tests/metadataHandler.ttml
rename to test/resources/metadataHandler.ttml
diff --git a/src/test/resources/unit-tests/timeExpressions.ttml b/test/resources/timeExpressions.ttml
similarity index 100%
rename from src/test/resources/unit-tests/timeExpressions.ttml
rename to test/resources/timeExpressions.ttml

From f4c5cde518e5beeaa04b27ebc5cdce3039ee6c6e Mon Sep 17 00:00:00 2001
From: Casey Occhialini <1508707+littlespex@users.noreply.github.com>
Date: Thu, 2 May 2024 09:00:13 -0700
Subject: [PATCH 14/21] fix: restore test folder structure

---
 package.json                                                    | 2 +-
 .../test/js/MetadataCallbacksTest.js                            | 2 +-
 test/ParseColor.test.js => src/test/js/ParseColorTest.js        | 2 +-
 .../test/js/ParseFontFamilyTest.js                              | 2 +-
 test/ParseLength.test.js => src/test/js/ParseLengthTest.js      | 2 +-
 test/ParsePosition.test.js => src/test/js/ParsePositionTest.js  | 2 +-
 .../test/js/ParseTextShadowTest.js                              | 2 +-
 .../test/js/ParseTimeExpressionsTest.js                         | 2 +-
 {test => src/test/js}/utils/close.js                            | 0
 {test => src/test/js}/utils/getIMSC1Document.js                 | 2 +-
 .../resources => src/test/resources/unit-tests}/fontFamily.ttml | 0
 .../test/resources/unit-tests}/lengthExpressions.ttml           | 0
 .../test/resources/unit-tests}/metadataHandler.ttml             | 0
 .../test/resources/unit-tests}/timeExpressions.ttml             | 0
 14 files changed, 9 insertions(+), 9 deletions(-)
 rename test/MetadataCallbacks.test.js => src/test/js/MetadataCallbacksTest.js (94%)
 rename test/ParseColor.test.js => src/test/js/ParseColorTest.js (96%)
 rename test/ParseFontFamily.test.js => src/test/js/ParseFontFamilyTest.js (93%)
 rename test/ParseLength.test.js => src/test/js/ParseLengthTest.js (89%)
 rename test/ParsePosition.test.js => src/test/js/ParsePositionTest.js (98%)
 rename test/ParseTextShadow.test.js => src/test/js/ParseTextShadowTest.js (93%)
 rename test/ParseTimeExpressions.test.js => src/test/js/ParseTimeExpressionsTest.js (90%)
 rename {test => src/test/js}/utils/close.js (100%)
 rename {test => src/test/js}/utils/getIMSC1Document.js (88%)
 rename {test/resources => src/test/resources/unit-tests}/fontFamily.ttml (100%)
 rename {test/resources => src/test/resources/unit-tests}/lengthExpressions.ttml (100%)
 rename {test/resources => src/test/resources/unit-tests}/metadataHandler.ttml (100%)
 rename {test/resources => src/test/resources/unit-tests}/timeExpressions.ttml (100%)

diff --git a/package.json b/package.json
index d6b459ed..591b4d61 100644
--- a/package.json
+++ b/package.json
@@ -34,7 +34,7 @@
         "lint": "eslint .",
         "fix": "eslint --fix src",
         "build": "grunt build",
-        "test": "node --test ./test/*.test.js"
+        "test": "node --test ./src/test/js/*Test.js"
     },
     "dependencies": {
         "sax": "1.2.1"
diff --git a/test/MetadataCallbacks.test.js b/src/test/js/MetadataCallbacksTest.js
similarity index 94%
rename from test/MetadataCallbacks.test.js
rename to src/test/js/MetadataCallbacksTest.js
index 562d5862..cd43f442 100644
--- a/test/MetadataCallbacks.test.js
+++ b/src/test/js/MetadataCallbacksTest.js
@@ -63,5 +63,5 @@ test("Metadata Callbacks", async () => {
     },
   };
 
-  await getIMSC1Document("./test/resources/metadataHandler.ttml", mh);
+  await getIMSC1Document("./src/test/resources/unit-tests/metadataHandler.ttml", mh);
 });
diff --git a/test/ParseColor.test.js b/src/test/js/ParseColorTest.js
similarity index 96%
rename from test/ParseColor.test.js
rename to src/test/js/ParseColorTest.js
index aaabb7e6..6f917d0c 100644
--- a/test/ParseColor.test.js
+++ b/src/test/js/ParseColorTest.js
@@ -1,6 +1,6 @@
 import { deepEqual } from "node:assert";
 import { test } from "node:test";
-import { parseColor } from "../src/main/js/utils.js";
+import { parseColor } from "../../main/js/utils.js";
 
 test("ParseColor", () => {
     const tests = [
diff --git a/test/ParseFontFamily.test.js b/src/test/js/ParseFontFamilyTest.js
similarity index 93%
rename from test/ParseFontFamily.test.js
rename to src/test/js/ParseFontFamilyTest.js
index b959feaa..30ad6e2c 100644
--- a/test/ParseFontFamily.test.js
+++ b/src/test/js/ParseFontFamilyTest.js
@@ -3,7 +3,7 @@ import { test } from "node:test";
 import { getIMSC1Document } from "./utils/getIMSC1Document.js";
 
 test("Font Family Parsing", async () => {
-  const doc = await getIMSC1Document("./test/resources/fontFamily.ttml");
+  const doc = await getIMSC1Document("./src/test/resources/unit-tests/fontFamily.ttml");
 
   deepEqual(
     doc.body.contents[0].contents[0].styleAttrs["http://www.w3.org/ns/ttml#styling fontFamily"],
diff --git a/test/ParseLength.test.js b/src/test/js/ParseLengthTest.js
similarity index 89%
rename from test/ParseLength.test.js
rename to src/test/js/ParseLengthTest.js
index 492ea34b..6c784320 100644
--- a/test/ParseLength.test.js
+++ b/src/test/js/ParseLengthTest.js
@@ -3,7 +3,7 @@ import { test } from "node:test";
 import { getIMSC1Document } from "./utils/getIMSC1Document.js";
 
 test("Parse Length Expressions", async () => {
-  const doc = await getIMSC1Document("./test/resources/lengthExpressions.ttml");
+  const doc = await getIMSC1Document("./src/test/resources/unit-tests/lengthExpressions.ttml");
 
   deepEqual(
     doc.body.contents[0].contents[0].styleAttrs["http://www.w3.org/ns/ttml#styling fontSize"],
diff --git a/test/ParsePosition.test.js b/src/test/js/ParsePositionTest.js
similarity index 98%
rename from test/ParsePosition.test.js
rename to src/test/js/ParsePositionTest.js
index 1fe32147..eb3d6425 100644
--- a/test/ParsePosition.test.js
+++ b/src/test/js/ParsePositionTest.js
@@ -1,6 +1,6 @@
 import { deepEqual } from "node:assert";
 import { test } from "node:test";
-import { parsePosition } from "../src/main/js/utils.js";
+import { parsePosition } from "../../main/js/utils.js";
 
 test("ParsePosition", () => {
 
diff --git a/test/ParseTextShadow.test.js b/src/test/js/ParseTextShadowTest.js
similarity index 93%
rename from test/ParseTextShadow.test.js
rename to src/test/js/ParseTextShadowTest.js
index d676bcaf..d6598976 100644
--- a/test/ParseTextShadow.test.js
+++ b/src/test/js/ParseTextShadowTest.js
@@ -1,6 +1,6 @@
 import { deepEqual } from "node:assert";
 import { test } from "node:test";
-import { parseTextShadow } from "../src/main/js/utils.js";
+import { parseTextShadow } from "../../main/js/utils.js";
 
 test("ParseTextShadow", () => {
 
diff --git a/test/ParseTimeExpressions.test.js b/src/test/js/ParseTimeExpressionsTest.js
similarity index 90%
rename from test/ParseTimeExpressions.test.js
rename to src/test/js/ParseTimeExpressionsTest.js
index 77355c1e..e205d24d 100644
--- a/test/ParseTimeExpressions.test.js
+++ b/src/test/js/ParseTimeExpressionsTest.js
@@ -4,7 +4,7 @@ import { close } from "./utils/close.js";
 import { getIMSC1Document } from "./utils/getIMSC1Document.js";
 
 test("Parse Time Expressions", async () => {
-  const doc = await getIMSC1Document("./test/resources/timeExpressions.ttml");
+  const doc = await getIMSC1Document("./src/test/resources/unit-tests/timeExpressions.ttml");
   close(doc.body.contents[0].contents[0].begin, 1.2, 1e-10);
   close(doc.body.contents[0].contents[1].begin, 72, 1e-10);
   close(doc.body.contents[0].contents[2].begin, 4320, 1e-10);
diff --git a/test/utils/close.js b/src/test/js/utils/close.js
similarity index 100%
rename from test/utils/close.js
rename to src/test/js/utils/close.js
diff --git a/test/utils/getIMSC1Document.js b/src/test/js/utils/getIMSC1Document.js
similarity index 88%
rename from test/utils/getIMSC1Document.js
rename to src/test/js/utils/getIMSC1Document.js
index 278560bc..51d5fe70 100644
--- a/test/utils/getIMSC1Document.js
+++ b/src/test/js/utils/getIMSC1Document.js
@@ -1,5 +1,5 @@
 import fs from "node:fs/promises";
-import { fromXML } from "../../src/main/js/doc.js";
+import { fromXML } from "../../../main/js/doc.js";
 
 const errorHandler = {
   info: function (msg) {
diff --git a/test/resources/fontFamily.ttml b/src/test/resources/unit-tests/fontFamily.ttml
similarity index 100%
rename from test/resources/fontFamily.ttml
rename to src/test/resources/unit-tests/fontFamily.ttml
diff --git a/test/resources/lengthExpressions.ttml b/src/test/resources/unit-tests/lengthExpressions.ttml
similarity index 100%
rename from test/resources/lengthExpressions.ttml
rename to src/test/resources/unit-tests/lengthExpressions.ttml
diff --git a/test/resources/metadataHandler.ttml b/src/test/resources/unit-tests/metadataHandler.ttml
similarity index 100%
rename from test/resources/metadataHandler.ttml
rename to src/test/resources/unit-tests/metadataHandler.ttml
diff --git a/test/resources/timeExpressions.ttml b/src/test/resources/unit-tests/timeExpressions.ttml
similarity index 100%
rename from test/resources/timeExpressions.ttml
rename to src/test/resources/unit-tests/timeExpressions.ttml

From 4cdb7f5b9f6bebd43f688674c7ed30860844b123 Mon Sep 17 00:00:00 2001
From: Pierre-Anthony Lemieux <pal@palemieux.com>
Date: Thu, 2 May 2024 10:24:40 -0700
Subject: [PATCH 15/21] Updated README

---
 README.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index a6dced8f..8ebf4629 100644
--- a/README.md
+++ b/README.md
@@ -50,7 +50,7 @@ DEVELOPMENT DEPENDENCIES
 QUICK START
 ===========
 
-* run the `build` target defined in [Gruntfile.js](Gruntfile.js) using [grunt](http://gruntjs.com/).
+* run the `build` target defined in [Gruntfile.cjs](./Gruntfile.cjs) using [grunt](http://gruntjs.com/).
 
 * the resulting `imsc.js` and `sax.js` files at `build/public_html/libs` are, respectively, the imscJS library and its sax-js dependency. For example, both libraries can be included in a web page as follows:
 
@@ -150,7 +150,7 @@ NOTABLE DIRECTORIES AND FILES
 
 * [package.json](package.json): NPM package definition
 
-* [Gruntfile.js](Gruntfile.js): Grunt build script
+* [Gruntfile.cjs](Gruntfile.cjs): Grunt build script
 
 * [properties.json](properties.json): General project properties
 

From 7b8bb967c169f5388e8606c1461deed49a929103 Mon Sep 17 00:00:00 2001
From: Casey Occhialini <1508707+littlespex@users.noreply.github.com>
Date: Mon, 31 Aug 2026 12:46:46 -0400
Subject: [PATCH 16/21] feat: add type definitions for all exported APIs

---
 package-lock.json     |  25 ++++
 package.json          |   1 +
 src/main/js/doc.js    | 316 +++++++++++++++++++++++++++++++++++++-----
 src/main/js/error.js  |  33 +++++
 src/main/js/html.js   |  17 ++-
 src/main/js/isd.js    |  26 +++-
 src/main/js/styles.js |  23 ++-
 src/main/js/utils.js  |  55 +++++---
 8 files changed, 434 insertions(+), 62 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index be702943..38042b02 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -16,6 +16,7 @@
                 "@rollup/plugin-commonjs": "^25.0.7",
                 "@rollup/plugin-node-resolve": "^15.2.3",
                 "@rollup/plugin-terser": "^0.4.4",
+                "@types/sax": "^1.2.7",
                 "eslint": "^9.1.1",
                 "filesaver.js-npm": "latest",
                 "globals": "^15.0.0",
@@ -580,12 +581,30 @@
             "integrity": "sha512-/kYRxGDLWzHOB7q+wtSUQlFrtcdUccpfy+X+9iMBpHK8QLLhx2wIPYuS5DYtR9Wa/YlZAbIovy7qVdB1Aq6Lyw==",
             "dev": true
         },
+        "node_modules/@types/node": {
+            "version": "20.14.5",
+            "resolved": "https://registry.npmjs.org/@types/node/-/node-20.14.5.tgz",
+            "integrity": "sha512-aoRR+fJkZT2l0aGOJhuA8frnCSoNX6W7U2mpNq63+BxBIj5BQFt8rHy627kijCmm63ijdSdwvGgpUsU6MBsZZA==",
+            "dev": true,
+            "dependencies": {
+                "undici-types": "~5.26.4"
+            }
+        },
         "node_modules/@types/resolve": {
             "version": "1.20.2",
             "resolved": "https://registry.npmjs.org/@types/resolve/-/resolve-1.20.2.tgz",
             "integrity": "sha512-60BCwRFOZCQhDncwQdxxeOEEkbc5dIMccYLwbxsS4TUNeVECQ/pBJ0j09mrHOl/JJvpRPGwO9SvE4nR2Nb/a4Q==",
             "dev": true
         },
+        "node_modules/@types/sax": {
+            "version": "1.2.7",
+            "resolved": "https://registry.npmjs.org/@types/sax/-/sax-1.2.7.tgz",
+            "integrity": "sha512-rO73L89PJxeYM3s3pPPjiPgVVcymqU490g0YO5n5By0k2Erzj6tay/4lr1CHAAU4JyOWd1rpQ8bCf6cZfHU96A==",
+            "dev": true,
+            "dependencies": {
+                "@types/node": "*"
+            }
+        },
         "node_modules/abbrev": {
             "version": "1.0.9",
             "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.9.tgz",
@@ -2865,6 +2884,12 @@
                 "node": "*"
             }
         },
+        "node_modules/undici-types": {
+            "version": "5.26.5",
+            "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-5.26.5.tgz",
+            "integrity": "sha512-JlCMO+ehdEIKqlFxk6IfVoAUVmgz7cU7zD/h9XZ0qzeosSHmUJVOzSQvvYSYWXkFXC+IfLKSIffhv0sVZup6pA==",
+            "dev": true
+        },
         "node_modules/universalify": {
             "version": "0.1.2",
             "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
diff --git a/package.json b/package.json
index 591b4d61..da0c1afc 100644
--- a/package.json
+++ b/package.json
@@ -44,6 +44,7 @@
         "@rollup/plugin-commonjs": "^25.0.7",
         "@rollup/plugin-node-resolve": "^15.2.3",
         "@rollup/plugin-terser": "^0.4.4",
+        "@types/sax": "^1.2.7",
         "eslint": "^9.1.1",
         "filesaver.js-npm": "latest",
         "globals": "^15.0.0",
diff --git a/src/main/js/doc.js b/src/main/js/doc.js
index e73b6bdb..f6420062 100644
--- a/src/main/js/doc.js
+++ b/src/main/js/doc.js
@@ -34,6 +34,14 @@ import { ComputedLength, hasOwnProperty, parseLength } from "./utils.js";
  * @module imscDoc
  */
 
+/**
+ * @typedef {import("./error").ErrorHandler} ErrorHandler
+ */
+
+/**
+ * @typedef {sax.Tag | sax.QualifiedTag} Node
+ */
+
 /**
  * Allows a client to provide callbacks to handle children of the <metadata> element
  * @typedef {Object} MetadataHandler
@@ -47,7 +55,7 @@ import { ComputedLength, hasOwnProperty, parseLength } from "./utils.js";
  * @callback OpenTagCallBack
  * @param {string} ns Namespace URI of the element
  * @param {string} name Local name of the element
- * @param {Object[]} attributes List of attributes, each consisting of a
+ * @param {Record<string, {uri: string, name: string, value: string}>} attributes List of attributes, each consisting of a
  *                              `uri`, `name` and `value`
  */
 
@@ -70,9 +78,9 @@ import { ComputedLength, hasOwnProperty, parseLength } from "./utils.js";
  * be called back when nodes are present in <metadata> elements.
  *
  * @param {string} xmlstring XML document
- * @param {?module:imscUtils.ErrorHandler} errorHandler Error callback
+ * @param {ErrorHandler} errorHandler Error callback
  * @param {?MetadataHandler} metadataHandler Callback for <Metadata> elements
- * @returns {Object} Opaque in-memory representation of an IMSC1 document
+ * @returns {?TT} Opaque in-memory representation of an IMSC1 document
  */
 
 export function fromXML(xmlstring, errorHandler, metadataHandler) {
@@ -807,19 +815,31 @@ function resolveTiming(doc, element, prev_sibling, parent) {
 
 }
 
-class ForeignElement {
+export class ForeignElement {
     constructor(node) {
         this.node = node;
     }
 }
 
-class TT {
+export class TT {
     constructor() {
+        /**
+         * @type {number[]}
+         */
         this.events = [];
         this.head = new Head();
+
+        /**
+         * @type {?Body}
+         */
         this.body = null;
     }
 
+    /**
+     * @param {Node} node
+     * @param {string} xmllang
+     * @param {ErrorHandler} errorHandler
+     */
     initFromNode(node, xmllang, errorHandler) {
 
         /* compute cell resolution */
@@ -887,7 +907,9 @@ class TT {
         };
 
         /* xml:lang */
-
+        /**
+         * @type {string}
+         */
         this.lang = xmllang;
 
     }
@@ -922,10 +944,10 @@ class TT {
 
     }
 
-    /*
+    /**
      * Retrieves the range of ISD times covered by the document
      *
-     * @returns {Array} Array of two elements: min_begin_time and max_begin_time
+     * @returns {[number, number]} Array of two elements: min_begin_time and max_begin_time
      *
      */
     getMediaTimeRange() {
@@ -933,10 +955,10 @@ class TT {
         return [this.events[0], this.events[this.events.length - 1]];
     };
 
-    /*
+    /**
      * Returns list of ISD begin times
      *
-     * @returns {Array}
+     * @returns {number[]}
      */
     getMediaTimeEvents() {
 
@@ -948,7 +970,7 @@ class TT {
  * Represents a TTML Head element
  */
 
-class Head {
+export class Head {
     constructor() {
         this.styling = new Styling();
         this.layout = new Layout();
@@ -959,9 +981,16 @@ class Head {
  * Represents a TTML Styling element
  */
 
-class Styling {
+export class Styling {
     constructor() {
+        /**
+         * @type {Record<string, Style>}
+         */
         this.styles = {};
+
+        /**
+         * @type {Record<string, any>}
+         */
         this.initials = {};
     }
 }
@@ -970,13 +999,28 @@ class Styling {
  * Represents a TTML Style element
  */
 
-class Style {
+export class Style {
     constructor() {
+        /**
+         * @type {string}
+         */
         this.id = null;
+
+        /**
+         * @type {Record<string, any>}
+         */
         this.styleAttrs = null;
+
+        /**
+         * @type {string[]}
+         */
         this.styleRefs = null;
     }
 
+    /**
+     * @param {Node} node
+     * @param {ErrorHandler} errorHandler
+     */
     initFromNode(node, errorHandler) {
         this.id = elementGetXMLID(node);
         this.styleAttrs = elementGetStyles(node, errorHandler);
@@ -988,11 +1032,17 @@ class Style {
  * Represents a TTML initial element
  */
 
-class Initial {
+export class Initial {
     constructor() {
+        /**
+         * @type {Record<string, string>}
+         */
         this.styleAttrs = null;
     }
 
+    /**
+     * @param {Node} node
+     */
     initFromNode(node) {
 
         this.styleAttrs = {};
@@ -1018,13 +1068,16 @@ class Initial {
  *
  */
 
-class Layout {
+export class Layout {
     constructor() {
         this.regions = {};
     }
 }
 
-class ContentElement {
+export class ContentElement {
+    /**
+     * @param {string} kind
+     */
     constructor(kind) {
         this.kind = kind;
     }
@@ -1034,13 +1087,32 @@ class ContentElement {
  * Represents a TTML image element
  */
 
-class Image extends ContentElement {
+export class Image extends ContentElement {
+    /**
+     * @param {string} src
+     * @param {string} type
+     */
     constructor(src, type) {
         super("image");
+
+        /**
+         * @type {string}
+         */
         this.src = src;
+
+        /**
+         * @type {string}
+         */
         this.type = type;
     }
 
+    /**
+     * @param {TT} doc
+     * @param {Node} parent
+     * @param {Node} node
+     * @param {string} xmllang
+     * @param {ErrorHandler} errorHandler
+     */
     initFromNode(doc, parent, node, xmllang, errorHandler) {
         this.src = "src" in node.attributes ? node.attributes.src.value : null;
 
@@ -1068,31 +1140,56 @@ class Image extends ContentElement {
  *
  */
 
-class IdentifiedElement {
+export class IdentifiedElement {
+    /**
+     * @param {string} id
+     */
     constructor(id) {
         this.id = id;
     }
 
+    /**
+     * @param {TT} doc
+     * @param {Node} parent
+     * @param {Node} node
+     */
     initFromNode(doc, parent, node) {
         this.id = elementGetXMLID(node);
     }
 }
 
-class LayoutElement {
+export class LayoutElement {
+    /**
+     * @param {string} id
+     */
     constructor(id) {
         this.regionID = id;
     }
 
+    /**
+     * @param {TT} doc
+     * @param {Node} parent
+     * @param {Node} node
+     */
     initFromNode(doc, parent, node) {
         this.regionID = elementGetRegionID(node);
     }
 }
 
-class StyledElement {
+export class StyledElement {
+    /**
+     * @param {Record<string, any>} styleAttrs
+     */
     constructor(styleAttrs) {
         this.styleAttrs = styleAttrs;
     }
 
+    /**
+     * @param {TT} doc
+     * @param {Node} parent
+     * @param {Node} node
+     * @param {ErrorHandler} errorHandler
+     */
     initFromNode(doc, parent, node, errorHandler) {
 
         this.styleAttrs = elementGetStyles(node, errorHandler);
@@ -1104,7 +1201,10 @@ class StyledElement {
     }
 }
 
-class AnimatedElement {
+export class AnimatedElement {
+    /**
+     * @param {any[]} sets
+     */
     constructor(sets) {
         this.sets = sets;
     }
@@ -1114,7 +1214,10 @@ class AnimatedElement {
     }
 }
 
-class ContainerElement {
+export class ContainerElement {
+    /**
+     * @param {string} contents
+     */
     constructor(contents) {
         this.contents = contents;
     }
@@ -1124,13 +1227,25 @@ class ContainerElement {
     }
 }
 
-class TimedElement {
+export class TimedElement {
+    /**
+     *
+     * @param {number} explicit_begin
+     * @param {number} explicit_end
+     * @param {number} explicit_dur
+     */
     constructor(explicit_begin, explicit_end, explicit_dur) {
         this.explicit_begin = explicit_begin;
         this.explicit_end = explicit_end;
         this.explicit_dur = explicit_dur;
     }
 
+    /**
+     * @param {TT} doc
+     * @param {Node} parent
+     * @param {Node} node
+     * @param {ErrorHandler} errorHandler
+     */
     initFromNode(doc, parent, node, errorHandler) {
         const t = processTiming(doc, parent, node, errorHandler);
         this.explicit_begin = t.explicit_begin;
@@ -1145,11 +1260,17 @@ class TimedElement {
  * Represents a TTML body element
  */
 
-class Body extends ContentElement {
+export class Body extends ContentElement {
     constructor() {
         super("body");
     }
 
+    /**
+     * @param {TT} doc
+     * @param {Node} node
+     * @param {string} xmllang
+     * @param {ErrorHandler} errorHandler
+     */
     initFromNode(doc, node, xmllang, errorHandler) {
         StyledElement.prototype.initFromNode.call(this, doc, null, node, errorHandler);
         TimedElement.prototype.initFromNode.call(this, doc, null, node, errorHandler);
@@ -1165,11 +1286,18 @@ class Body extends ContentElement {
  * Represents a TTML div element
  */
 
-class Div extends ContentElement {
+export class Div extends ContentElement {
     constructor() {
         super("div");
     }
 
+    /**
+     * @param {TT} doc
+     * @param {Node} parent
+     * @param {Node} node
+     * @param {string} xmllang
+     * @param {ErrorHandler} errorHandler
+     */
     initFromNode(doc, parent, node, xmllang, errorHandler) {
         StyledElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
         TimedElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
@@ -1185,11 +1313,18 @@ class Div extends ContentElement {
  * Represents a TTML p element
  */
 
-class P extends ContentElement {
+export class P extends ContentElement {
     constructor() {
         super("p");
     }
 
+    /**
+     * @param {TT} doc
+     * @param {Node} parent
+     * @param {Node} node
+     * @param {string} xmllang
+     * @param {ErrorHandler} errorHandler
+     */
     initFromNode(doc, parent, node, xmllang, errorHandler) {
         StyledElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
         TimedElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
@@ -1205,11 +1340,19 @@ class P extends ContentElement {
  * Represents a TTML span element
  */
 
-class Span extends ContentElement {
+export class Span extends ContentElement {
     constructor() {
         super("span");
     }
 
+    /**
+     * @param {TT} doc
+     * @param {Node} parent
+     * @param {Node} node
+     * @param {string} xmllang
+     * @param {string} xmlspace
+     * @param {ErrorHandler} errorHandler
+     */
     initFromNode(doc, parent, node, xmllang, xmlspace, errorHandler) {
         StyledElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
         TimedElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
@@ -1226,11 +1369,19 @@ class Span extends ContentElement {
  * Represents a TTML anonymous span element
  */
 
-class AnonymousSpan extends ContentElement {
+export class AnonymousSpan extends ContentElement {
     constructor() {
         super("span");
     }
 
+    /**
+     * @param {TT} doc
+     * @param {Node} parent
+     * @param {string} text
+     * @param {string} xmlspace
+     * @param {string} xmllang
+     * @param {ErrorHandler} errorHandler
+     */
     initFromText(doc, parent, text, xmllang, xmlspace, errorHandler) {
         TimedElement.prototype.initFromNode.call(this, doc, parent, null, errorHandler);
 
@@ -1244,11 +1395,18 @@ class AnonymousSpan extends ContentElement {
  * Represents a TTML br element
  */
 
-class Br extends ContentElement {
+export class Br extends ContentElement {
     constructor() {
         super("br");
     }
 
+    /**
+     * @param {TT} doc
+     * @param {Node} parent
+     * @param {Node} node
+     * @param {string} xmllang
+     * @param {ErrorHandler} errorHandler
+     */
     initFromNode(doc, parent, node, xmllang, errorHandler) {
         LayoutElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
         TimedElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
@@ -1262,9 +1420,13 @@ class Br extends ContentElement {
  *
  */
 
-class Region {
+export class Region {
     constructor() { }
 
+    /**
+     * @param {string} xmllang
+     * @returns {Region}
+     */
     createDefaultRegion(xmllang) {
         const r = new Region();
 
@@ -1280,6 +1442,12 @@ class Region {
         return r;
     }
 
+    /**
+     * @param {TT} doc
+     * @param {Node} node
+     * @param {string} xmllang
+     * @param {ErrorHandler} errorHandler
+     */
     initFromNode(doc, node, xmllang, errorHandler) {
         IdentifiedElement.prototype.initFromNode.call(this, doc, null, node, errorHandler);
         TimedElement.prototype.initFromNode.call(this, doc, null, node, errorHandler);
@@ -1304,10 +1472,16 @@ class Region {
  *
  */
 
-class Set {
+export class Set {
     constructor() {
     }
 
+    /**
+     * @param {TT} doc
+     * @param {Node} parent
+     * @param {Node} node
+     * @param {ErrorHandler} errorHandler
+     */
     initFromNode(doc, parent, node, errorHandler) {
 
         TimedElement.prototype.initFromNode.call(this, doc, parent, node, errorHandler);
@@ -1341,14 +1515,27 @@ class Set {
  *
  */
 
+/**
+ * @param {Node} node
+ * @returns {string | null}
+ */
 function elementGetXMLID(node) {
     return node && "xml:id" in node.attributes ? node.attributes["xml:id"].value || null : null;
 }
 
+/**
+ * @param {Node} node
+ * @returns {string}
+ */
 function elementGetRegionID(node) {
     return node && "region" in node.attributes ? node.attributes.region.value : "";
 }
 
+/**
+ * @param {Node} node
+ * @param {ErrorHandler} errorHandler
+ * @returns {string}
+ */
 function elementGetTimeContainer(node, errorHandler) {
 
     const tc = node && "timeContainer" in node.attributes ? node.attributes.timeContainer.value : null;
@@ -1371,12 +1558,21 @@ function elementGetTimeContainer(node, errorHandler) {
 
 }
 
+/**
+ * @param {Node} node
+ * @returns {string[]}
+ */
 function elementGetStyleRefs(node) {
 
     return node && "style" in node.attributes ? node.attributes.style.value.split(" ") : [];
 
 }
 
+/**
+ * @param {Node} node
+ * @param {ErrorHandler} errorHandler
+ * @returns {Record<string, any>}
+ */
 function elementGetStyles(node, errorHandler) {
 
     const s = {};
@@ -1418,6 +1614,12 @@ function elementGetStyles(node, errorHandler) {
     return s;
 }
 
+/**
+ * @param {Node} node
+ * @param {string} ns
+ * @param {string} name
+ * @returns {string | null}
+ */
 function findAttribute(node, ns, name) {
     for (const i in node.attributes) {
 
@@ -1431,6 +1633,11 @@ function findAttribute(node, ns, name) {
     return null;
 }
 
+/**
+ * @param {Node} node
+ * @param {ErrorHandler} errorHandler
+ * @returns {number | null}
+ */
 function extractAspectRatio(node, errorHandler) {
 
     let ar = findAttribute(node, ns_ittp, "aspectRatio");
@@ -1475,9 +1682,12 @@ function extractAspectRatio(node, errorHandler) {
 
 }
 
-/*
+/**
  * Returns the cellResolution attribute from a node
  *
+ * @param {Node} node
+ * @param {ErrorHandler} errorHandler
+ * @returns {{w: number, h: number}}
  */
 function extractCellResolution(node, errorHandler) {
 
@@ -1512,6 +1722,11 @@ function extractCellResolution(node, errorHandler) {
 
 }
 
+/**
+ * @param {Node} node
+ * @param {ErrorHandler} errorHandler
+ * @returns {{ effectiveFrameRate: number, tickRate: number }}
+ */
 function extractFrameAndTickRate(node, errorHandler) {
 
     // subFrameRate is ignored per IMSC1 specification
@@ -1604,6 +1819,11 @@ function extractFrameAndTickRate(node, errorHandler) {
 
 }
 
+/**
+ * @param {Node} node
+ * @param {ErrorHandler} errorHandler
+ * @returns {{w: number, h: number} | null}
+ */
 function extractExtent(node, errorHandler) {
 
     const attr = findAttribute(node, ns_tts, "extent");
@@ -1635,6 +1855,12 @@ function extractExtent(node, errorHandler) {
 
 }
 
+/**
+ * @param {number} tickRate
+ * @param {number} effectiveFrameRate
+ * @param {string} str
+ * @returns {number | null}
+ */
 function parseTimeExpression(tickRate, effectiveFrameRate, str) {
 
     const CLOCK_TIME_FRACTION_RE = /^(\d{2,}):(\d\d):(\d\d(?:\.\d+)?)$/;
@@ -1700,6 +1926,13 @@ function parseTimeExpression(tickRate, effectiveFrameRate, str) {
     return r;
 }
 
+/**
+ * @param {TT} doc
+ * @param {Node} parent
+ * @param {Node} node
+ * @param {ErrorHandler} errorHandler
+ * @returns {{explicit_begin: number, explicit_end: number, explicit_dur: number}}
+ */
 function processTiming(doc, parent, node, errorHandler) {
 
     /* determine explicit begin */
@@ -1758,6 +1991,11 @@ function processTiming(doc, parent, node, errorHandler) {
 
 }
 
+/**
+ * @param {Styling} styling
+ * @param {Style} style
+ * @param {ErrorHandler} errorHandler
+ */
 function mergeChainedStyles(styling, style, errorHandler) {
 
     while (style.styleRefs.length > 0) {
@@ -1777,6 +2015,12 @@ function mergeChainedStyles(styling, style, errorHandler) {
 
 }
 
+/**
+ * @param {Styling} styling
+ * @param {string[]} stylerefs
+ * @param {Record<string, any>} styleattrs
+ * @param {ErrorHandler} errorHandler
+ */
 function mergeReferencedStyles(styling, stylerefs, styleattrs, errorHandler) {
 
     for (let i = stylerefs.length - 1; i >= 0; i--) {
@@ -1794,6 +2038,10 @@ function mergeReferencedStyles(styling, stylerefs, styleattrs, errorHandler) {
 
 }
 
+/**
+ * @param {Record<string, any>} from_styles
+ * @param {Record<string, any>} into_styles
+ */
 function mergeStylesIfNotPresent(from_styles, into_styles) {
 
     for (const sname in from_styles) {
@@ -1811,13 +2059,15 @@ function mergeStylesIfNotPresent(from_styles, into_styles) {
 
 /* TODO: validate style format at parsing */
 
-/*
+/**
  * Binary search utility function
  *
  * @typedef {Object} BinarySearchResult
  * @property {boolean} found Was an exact match found?
  * @property {number} index Position of the exact match or insert position
  *
+ * @param {number[]} arr
+ * @param {number} searchval
  * @returns {BinarySearchResult}
  */
 
diff --git a/src/main/js/error.js b/src/main/js/error.js
index 84c27f69..fc6b8e3d 100644
--- a/src/main/js/error.js
+++ b/src/main/js/error.js
@@ -3,6 +3,14 @@
  *
  */
 
+/**
+ * @module imscError
+ */
+
+/**
+ * @param {ErrorHandler} errorHandler
+ * @param {string} msg
+ */
 export function reportWarning(errorHandler, msg) {
 
   if (errorHandler && errorHandler.warn && errorHandler.warn(msg))
@@ -10,6 +18,10 @@ export function reportWarning(errorHandler, msg) {
 
 }
 
+/**
+ * @param {ErrorHandler} errorHandler
+ * @param {string} msg
+ */
 export function reportError(errorHandler, msg) {
 
   if (errorHandler && errorHandler.error && errorHandler.error(msg))
@@ -17,6 +29,10 @@ export function reportError(errorHandler, msg) {
 
 }
 
+/**
+ * @param {ErrorHandler} errorHandler
+ * @param {string} msg
+ */
 export function reportFatal(errorHandler, msg) {
 
   if (errorHandler && errorHandler.fatal)
@@ -25,3 +41,20 @@ export function reportFatal(errorHandler, msg) {
   throw msg;
 
 }
+
+/**
+ * Generic interface for handling events. The interface exposes four
+ * methods:
+ * - <pre>info</pre>: unusual event that does not result in an inconsistent state
+ * - <pre>warn</pre>: unexpected event that should not result in an inconsistent state
+ * - <pre>error</pre>: unexpected event that may result in an inconsistent state
+ * - <pre>fatal</pre>: unexpected event that results in an inconsistent state
+ *   and termination of processing
+ * Each method takes a single <pre>string</pre> describing the event as argument,
+ * and returns a single <pre>boolean</pre>, which terminates processing if <pre>true</pre>.
+ *
+ * @typedef {Object} ErrorHandler
+ * @property {(msg: string) => boolean} warn
+ * @property {(msg: string) => boolean} error
+ * @property {(msg: string) => boolean} fatal
+ */
diff --git a/src/main/js/html.js b/src/main/js/html.js
index bd0a557a..9a62ac70 100755
--- a/src/main/js/html.js
+++ b/src/main/js/html.js
@@ -27,6 +27,11 @@
 import { reportError } from "./error.js";
 import { byName } from "./styles.js";
 
+/**
+ * @typedef {import("./isd").ISD} ISD
+ * @typedef {import("./error").ErrorHandler} ErrorHandler
+ */
+
 /**
  * @module imscHTML
  */
@@ -36,7 +41,7 @@ const browserIsFirefox = /firefox/i.test(navigator.userAgent);
 /**
  * Function that maps <pre>smpte:background</pre> URIs to URLs resolving to image resource
  * @callback IMGResolver
- * @param {string} <pre>smpte:background</pre> URI
+ * @param {string} value <pre>smpte:background</pre> URI
  * @return {string} PNG resource URL
  */
 
@@ -56,8 +61,8 @@ const browserIsFirefox = /firefox/i.test(navigator.userAgent);
  * is called for the next ISD, otherwise <code>previousISDState</code> should be set to
  * <code>null</code>.
  *
- * @param {Object} isd ISD to be rendered
- * @param {Object} element Element into which the ISD is rendered
+ * @param {ISD} isd ISD to be rendered
+ * @param {HTMLElement} element Element into which the ISD is rendered
  * @param {?IMGResolver} imgResolver Resolve <pre>smpte:background</pre> URIs into URLs.
  * @param {?number} eheight Height (in pixel) of the child <div>div</div> or null
  *                  to use clientHeight of the parent element
@@ -65,10 +70,10 @@ const browserIsFirefox = /firefox/i.test(navigator.userAgent);
  *                  to use clientWidth of the parent element
  * @param {?boolean} displayForcedOnlyMode Value of the IMSC1 displayForcedOnlyMode parameter,
  *                   or false if null
- * @param {?module:imscUtils.ErrorHandler} errorHandler Error callback
- * @param {Object} previousISDState State saved during processing of the previous ISD, or null if initial call
+ * @param {?ErrorHandler} errorHandler Error callback
+ * @param {ISD} previousISDState State saved during processing of the previous ISD, or null if initial call
  * @param {?boolean} enableRollUp Enables roll-up animations (see CEA 708)
- * @return {Object} ISD state to be provided when this funtion is called for the next ISD
+ * @return {ISD} ISD state to be provided when this function is called for the next ISD
  */
 
 export function renderHTML(isd,
diff --git a/src/main/js/isd.js b/src/main/js/isd.js
index b3880e06..f3e677ad 100644
--- a/src/main/js/isd.js
+++ b/src/main/js/isd.js
@@ -32,15 +32,20 @@ import { ComputedLength, hasOwnProperty } from "./utils.js";
  * @module imscISD
  */
 
+/**
+ * @typedef {import("./doc").TT} TT
+ * @typedef {import("./error").ErrorHandler} ErrorHandler
+ */
+
 /**
  * Creates a canonical representation of an IMSC1 document returned by <pre>imscDoc.fromXML()</pre>
  * at a given absolute offset in seconds. This offset does not have to be one of the values returned
  * by <pre>getMediaTimeEvents()</pre>.
  *
- * @param {Object} tt IMSC1 document
+ * @param {TT} tt IMSC1 document
  * @param {number} offset Absolute offset (in seconds)
- * @param {?module:imscUtils.ErrorHandler} errorHandler Error callback
- * @returns {Object} Opaque in-memory representation of an ISD
+ * @param {ErrorHandler} errorHandler Error callback
+ * @returns {ISD} Opaque in-memory representation of an ISD
  */
 
 export function generateISD(tt, offset, errorHandler) {
@@ -720,15 +725,26 @@ function pruneEmptySpans(element) {
     }
 }
 
-class ISD {
+export class ISD {
     constructor(tt) {
+        /**
+         * @type {ISDContentElement[]}
+         */
         this.contents = [];
+
+        /**
+         * @type {string}
+         */
         this.aspectRatio = tt.aspectRatio;
+
+        /**
+         * @type {string}
+         */
         this.lang = tt.lang;
     }
 }
 
-class ISDContentElement {
+export class ISDContentElement {
     constructor(ttelem) {
 
         /* assume the element is a region if it does not have a kind */
diff --git a/src/main/js/styles.js b/src/main/js/styles.js
index df523e96..68423ed2 100644
--- a/src/main/js/styles.js
+++ b/src/main/js/styles.js
@@ -31,7 +31,22 @@ import { ComputedLength, parseColor, parseLength, parsePosition, parseTextShadow
  * @module imscStyles
  */
 
-class StylingAttributeDefinition {
+/**
+ * @typedef {import("./doc").TT} TT
+ * @typedef {import("./doc").Node} Node
+ */
+
+export class StylingAttributeDefinition {
+    /**
+     * @param {string} ns
+     * @param {string} name
+     * @param {string} initialValue
+     * @param {string[]} appliesTo
+     * @param {boolean} isInherit
+     * @param {boolean} isAnimatable
+     * @param {(value: string) => any} parseFunc
+     * @param {(doc: TT, parent: Node, element: Node, attr: string) => any} computeFunc
+     */
     constructor(ns, name, initialValue, appliesTo, isInherit, isAnimatable, parseFunc, computeFunc) {
         this.name = name;
         this.ns = ns;
@@ -1193,12 +1208,18 @@ export const all = [
 
 /* TODO: allow null parse function */
 
+/**
+ * @type {Record<string, StylingAttributeDefinition>}
+ */
 export const byQName = {};
 for (const i in all) {
 
     byQName[all[i].qname] = all[i];
 }
 
+/**
+ * @type {Record<string, StylingAttributeDefinition>}
+ */
 export const byName = {};
 for (const j in all) {
 
diff --git a/src/main/js/utils.js b/src/main/js/utils.js
index 5a682f5a..036d74e5 100644
--- a/src/main/js/utils.js
+++ b/src/main/js/utils.js
@@ -28,23 +28,6 @@
  * @module imscUtils
  */
 
-/* Documents the error handler interface */
-
-/**
- * @classdesc Generic interface for handling events. The interface exposes four
- * methods:
- * * <pre>info</pre>: unusual event that does not result in an inconsistent state
- * * <pre>warn</pre>: unexpected event that should not result in an inconsistent state
- * * <pre>error</pre>: unexpected event that may result in an inconsistent state
- * * <pre>fatal</pre>: unexpected event that results in an inconsistent state
- *   and termination of processing
- * Each method takes a single <pre>string</pre> describing the event as argument,
- * and returns a single <pre>boolean</pre>, which terminates processing if <pre>true</pre>.
- *
- * @name ErrorHandler
- * @class
- */
-
 /*
  * Parses a TTML color expression
  *
@@ -75,6 +58,10 @@ const NAMED_COLOR = {
     cyan: [0, 255, 255, 255],
 };
 
+/**
+ * @param {string} str
+ * @returns {[number, number, number, number]}
+ */
 export function parseColor(str) {
 
     let m;
@@ -115,6 +102,10 @@ export function parseColor(str) {
 
 const LENGTH_RE = /^((?:\+|-)?\d*(?:\.\d+)?)(px|em|c|%|rh|rw)$/;
 
+/**
+ * @param {string} str
+ * @returns {{ value: number, unit: string } | null}
+ */
 export function parseLength(str) {
 
     let m;
@@ -129,6 +120,10 @@ export function parseLength(str) {
     return r;
 };
 
+/**
+ * @param {string} str
+ * @returns {string | any[] | null}
+ */
 export function parseTextShadow(str) {
 
     const shadows = str.match(/([^(,)]|\([^)]+\))+/g);
@@ -202,6 +197,15 @@ export function parseTextShadow(str) {
     return r;
 };
 
+/**
+ * @typedef {{ value: number, unit: string }} Offset
+ * @typedef {{ edge: string, offset: Offset }} Position
+ */
+
+/**
+ * @param {string} str
+ * @returns {{h: Position, v: Position} | null}
+ */
 export function parsePosition(str) {
 
     /* see https://www.w3.org/TR/ttml2/#style-value-position */
@@ -327,15 +331,27 @@ export function parsePosition(str) {
 };
 
 export class ComputedLength {
+    /**
+     * @param {number} rw
+     * @param {number} rh
+     */
     constructor(rw, rh) {
         this.rw = rw;
         this.rh = rh;
     }
 
+    /**
+     * @param {number} width
+     * @param {number} height
+     * @returns {number}
+     */
     toUsedLength(width, height) {
         return width * this.rw + height * this.rh;
     };
 
+    /**
+     * @returns {boolean}
+     */
     isZero() {
         return this.rw === 0 && this.rh === 0;
     };
@@ -406,6 +422,11 @@ export function toComputedLength(lengthVal, lengthUnit, emLength, percentLength,
 
 }
 
+/**
+ * @param {Object} obj
+ * @param {string} prop
+ * @returns {boolean}
+ */
 export function hasOwnProperty(obj, prop) {
     return Object.prototype.hasOwnProperty.call(obj, prop);
 }

From 92e536b80d8629465c674d223cf5316412400707 Mon Sep 17 00:00:00 2001
From: Pierre-Anthony Lemieux <pal@palemieux.com>
Date: Mon, 31 Aug 2026 10:05:53 -0700
Subject: [PATCH 17/21] Bump @rollup/plugin-terser

---
 package-lock.json | 1601 +++++++++++++++++++++++++++------------------
 package.json      |    2 +-
 2 files changed, 959 insertions(+), 644 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index 38042b02..8f94fff6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -15,7 +15,7 @@
                 "@eslint/js": "^9.1.1",
                 "@rollup/plugin-commonjs": "^25.0.7",
                 "@rollup/plugin-node-resolve": "^15.2.3",
-                "@rollup/plugin-terser": "^0.4.4",
+                "@rollup/plugin-terser": "^1.0.0",
                 "@types/sax": "^1.2.7",
                 "eslint": "^9.1.1",
                 "filesaver.js-npm": "latest",
@@ -33,16 +33,20 @@
             }
         },
         "node_modules/@eslint-community/eslint-utils": {
-            "version": "4.4.0",
-            "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.4.0.tgz",
-            "integrity": "sha512-1/sA4dwrzBAyeUoQ6oxahHKmrZvsnLCg4RfxW3ZFGGmQkSNQPFNLV9CUEFQP1x9EYXHTo5p6xdhZM1Ne9p/AfA==",
+            "version": "4.10.1",
+            "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.10.1.tgz",
+            "integrity": "sha512-cuadcxVFE8sDK6iWJbs8Sn0av2Nrh2QSGQhVlBW9AaAHqHwjWsZHT8LJ4hFGPh7ASBV2deFdM7H/DPjulmh8rg==",
             "dev": true,
+            "license": "MIT",
             "dependencies": {
-                "eslint-visitor-keys": "^3.3.0"
+                "eslint-visitor-keys": "^3.4.3"
             },
             "engines": {
                 "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
             },
+            "funding": {
+                "url": "https://opencollective.com/eslint"
+            },
             "peerDependencies": {
                 "eslint": "^6.0.0 || ^7.0.0 || >=8.0.0"
             }
@@ -52,6 +56,7 @@
             "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-3.4.3.tgz",
             "integrity": "sha512-wpc+LXeiyiisxPlEkUzU6svyS1frIO3Mgxj1fdy7Pm8Ygzguax2N3Fa/D/ag1WqbOprdI+uY6wMUl8/a2G+iag==",
             "dev": true,
+            "license": "Apache-2.0",
             "engines": {
                 "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
             },
@@ -60,28 +65,71 @@
             }
         },
         "node_modules/@eslint-community/regexpp": {
-            "version": "4.10.0",
-            "resolved": "https://registry.npmjs.org/@eslint-community/regexpp/-/regexpp-4.10.0.tgz",
-            "integrity": "sha512-Cu96Sd2By9mCNTx2iyKOmq10v22jUVQv0lQnlGNy16oE9589yE+QADPbrMGCkA51cKZSg3Pu/aTJVTGfL/qjUA==",
+            "version": "4.12.2",
+            "resolved": "https://registry.npmjs.org/@eslint-community/regexpp/-/regexpp-4.12.2.tgz",
+            "integrity": "sha512-EriSTlt5OC9/7SXkRSCAhfSxxoSUgBm33OH+IkwbdpgoqsSsUg7y3uh+IICI/Qg4BBWr3U2i39RpmycbxMq4ew==",
             "dev": true,
+            "license": "MIT",
             "engines": {
                 "node": "^12.0.0 || ^14.0.0 || >=16.0.0"
             }
         },
+        "node_modules/@eslint/config-array": {
+            "version": "0.21.2",
+            "resolved": "https://registry.npmjs.org/@eslint/config-array/-/config-array-0.21.2.tgz",
+            "integrity": "sha512-nJl2KGTlrf9GjLimgIru+V/mzgSK0ABCDQRvxw5BjURL7WfH5uoWmizbH7QB6MmnMBd8cIC9uceWnezL1VZWWw==",
+            "dev": true,
+            "license": "Apache-2.0",
+            "dependencies": {
+                "@eslint/object-schema": "^2.1.7",
+                "debug": "^4.3.1",
+                "minimatch": "^3.1.5"
+            },
+            "engines": {
+                "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+            }
+        },
+        "node_modules/@eslint/config-helpers": {
+            "version": "0.4.2",
+            "resolved": "https://registry.npmjs.org/@eslint/config-helpers/-/config-helpers-0.4.2.tgz",
+            "integrity": "sha512-gBrxN88gOIf3R7ja5K9slwNayVcZgK6SOUORm2uBzTeIEfeVaIhOpCtTox3P6R7o2jLFwLFTLnC7kU/RGcYEgw==",
+            "dev": true,
+            "license": "Apache-2.0",
+            "dependencies": {
+                "@eslint/core": "^0.17.0"
+            },
+            "engines": {
+                "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+            }
+        },
+        "node_modules/@eslint/core": {
+            "version": "0.17.0",
+            "resolved": "https://registry.npmjs.org/@eslint/core/-/core-0.17.0.tgz",
+            "integrity": "sha512-yL/sLrpmtDaFEiUj1osRP4TI2MDz1AddJL+jZ7KSqvBuliN4xqYY54IfdN8qD8Toa6g1iloph1fxQNkjOxrrpQ==",
+            "dev": true,
+            "license": "Apache-2.0",
+            "dependencies": {
+                "@types/json-schema": "^7.0.15"
+            },
+            "engines": {
+                "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+            }
+        },
         "node_modules/@eslint/eslintrc": {
-            "version": "3.0.2",
-            "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-3.0.2.tgz",
-            "integrity": "sha512-wV19ZEGEMAC1eHgrS7UQPqsdEiCIbTKTasEfcXAigzoXICcqZSjBZEHlZwNVvKg6UBCjSlos84XiLqsRJnIcIg==",
+            "version": "3.3.6",
+            "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-3.3.6.tgz",
+            "integrity": "sha512-l2Ul9PrHsPCKcEY/ac7VgFj9D80C7S68sOKc618SyHDPK36s1XcFebXY0iTzUVn4Yq+YbwvSnDmCz9yxjX+QrA==",
             "dev": true,
+            "license": "MIT",
             "dependencies": {
-                "ajv": "^6.12.4",
+                "ajv": "^6.14.0",
                 "debug": "^4.3.2",
                 "espree": "^10.0.1",
                 "globals": "^14.0.0",
                 "ignore": "^5.2.0",
                 "import-fresh": "^3.2.1",
-                "js-yaml": "^4.1.0",
-                "minimatch": "^3.1.2",
+                "js-yaml": "^4.3.0",
+                "minimatch": "^3.1.5",
                 "strip-json-comments": "^3.1.1"
             },
             "engines": {
@@ -96,6 +144,7 @@
             "resolved": "https://registry.npmjs.org/globals/-/globals-14.0.0.tgz",
             "integrity": "sha512-oahGvuMGQlPw/ivIYBjVSrWAfWLBeku5tpPE2fOPLi+WHffIWbuh2tCjhyQhTBPMf5E9jDEH4FOmTYgYwbKwtQ==",
             "dev": true,
+            "license": "MIT",
             "engines": {
                 "node": ">=18"
             },
@@ -104,26 +153,78 @@
             }
         },
         "node_modules/@eslint/js": {
-            "version": "9.1.1",
-            "resolved": "https://registry.npmjs.org/@eslint/js/-/js-9.1.1.tgz",
-            "integrity": "sha512-5WoDz3Y19Bg2BnErkZTp0en+c/i9PvgFS7MBe1+m60HjFr0hrphlAGp4yzI7pxpt4xShln4ZyYp4neJm8hmOkQ==",
+            "version": "9.39.5",
+            "resolved": "https://registry.npmjs.org/@eslint/js/-/js-9.39.5.tgz",
+            "integrity": "sha512-QywQuszQh77pIXCsq998c8hbhSTI/azTty1Z6N53dmAudKHhy573j3yvRLsX2BSp8YpLtoCEG8E9DJe+8zUh4A==",
             "dev": true,
+            "license": "MIT",
             "engines": {
                 "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+            },
+            "funding": {
+                "url": "https://eslint.org/donate"
             }
         },
-        "node_modules/@humanwhocodes/config-array": {
-            "version": "0.13.0",
-            "resolved": "https://registry.npmjs.org/@humanwhocodes/config-array/-/config-array-0.13.0.tgz",
-            "integrity": "sha512-DZLEEqFWQFiyK6h5YIeynKx7JlvCYWL0cImfSRXZ9l4Sg2efkFGTuFf6vzXjK1cq6IYkU+Eg/JizXw+TD2vRNw==",
+        "node_modules/@eslint/object-schema": {
+            "version": "2.1.7",
+            "resolved": "https://registry.npmjs.org/@eslint/object-schema/-/object-schema-2.1.7.tgz",
+            "integrity": "sha512-VtAOaymWVfZcmZbp6E2mympDIHvyjXs/12LqWYjVw6qjrfF+VK+fyG33kChz3nnK+SU5/NeHOqrTEHS8sXO3OA==",
             "dev": true,
+            "license": "Apache-2.0",
+            "engines": {
+                "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+            }
+        },
+        "node_modules/@eslint/plugin-kit": {
+            "version": "0.4.1",
+            "resolved": "https://registry.npmjs.org/@eslint/plugin-kit/-/plugin-kit-0.4.1.tgz",
+            "integrity": "sha512-43/qtrDUokr7LJqoF2c3+RInu/t4zfrpYdoSDfYyhg52rwLV6TnOvdG4fXm7IkSB3wErkcmJS9iEhjVtOSEjjA==",
+            "dev": true,
+            "license": "Apache-2.0",
             "dependencies": {
-                "@humanwhocodes/object-schema": "^2.0.3",
-                "debug": "^4.3.1",
-                "minimatch": "^3.0.5"
+                "@eslint/core": "^0.17.0",
+                "levn": "^0.4.1"
+            },
+            "engines": {
+                "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+            }
+        },
+        "node_modules/@humanfs/core": {
+            "version": "0.19.2",
+            "resolved": "https://registry.npmjs.org/@humanfs/core/-/core-0.19.2.tgz",
+            "integrity": "sha512-UhXNm+CFMWcbChXywFwkmhqjs3PRCmcSa/hfBgLIb7oQ5HNb1wS0icWsGtSAUNgefHeI+eBrA8I1fxmbHsGdvA==",
+            "dev": true,
+            "license": "Apache-2.0",
+            "dependencies": {
+                "@humanfs/types": "^0.15.0"
             },
             "engines": {
-                "node": ">=10.10.0"
+                "node": ">=18.18.0"
+            }
+        },
+        "node_modules/@humanfs/node": {
+            "version": "0.16.8",
+            "resolved": "https://registry.npmjs.org/@humanfs/node/-/node-0.16.8.tgz",
+            "integrity": "sha512-gE1eQNZ3R++kTzFUpdGlpmy8kDZD/MLyHqDwqjkVQI0JMdI1D51sy1H958PNXYkM2rAac7e5/CnIKZrHtPh3BQ==",
+            "dev": true,
+            "license": "Apache-2.0",
+            "dependencies": {
+                "@humanfs/core": "^0.19.2",
+                "@humanfs/types": "^0.15.0",
+                "@humanwhocodes/retry": "^0.4.0"
+            },
+            "engines": {
+                "node": ">=18.18.0"
+            }
+        },
+        "node_modules/@humanfs/types": {
+            "version": "0.15.0",
+            "resolved": "https://registry.npmjs.org/@humanfs/types/-/types-0.15.0.tgz",
+            "integrity": "sha512-ZZ1w0aoQkwuUuC7Yf+7sdeaNfqQiiLcSRbfI08oAxqLtpXQr9AIVX7Ay7HLDuiLYAaFPu8oBYNq/QIi9URHJ3Q==",
+            "dev": true,
+            "license": "Apache-2.0",
+            "engines": {
+                "node": ">=18.18.0"
             }
         },
         "node_modules/@humanwhocodes/module-importer": {
@@ -131,6 +232,7 @@
             "resolved": "https://registry.npmjs.org/@humanwhocodes/module-importer/-/module-importer-1.0.1.tgz",
             "integrity": "sha512-bxveV4V8v5Yb4ncFTT3rPSgZBOpCkjfK0y4oVVVJwIuDVBRMDXrPyXRL988i5ap9m9bnyEEjWfm5WkBmtffLfA==",
             "dev": true,
+            "license": "Apache-2.0",
             "engines": {
                 "node": ">=12.22"
             },
@@ -139,17 +241,12 @@
                 "url": "https://github.com/sponsors/nzakas"
             }
         },
-        "node_modules/@humanwhocodes/object-schema": {
-            "version": "2.0.3",
-            "resolved": "https://registry.npmjs.org/@humanwhocodes/object-schema/-/object-schema-2.0.3.tgz",
-            "integrity": "sha512-93zYdMES/c1D69yZiKDBj0V24vqNzB/koF26KPaagAfd3P/4gUlh3Dys5ogAK+Exi9QyzlD8x/08Zt7wIKcDcA==",
-            "dev": true
-        },
         "node_modules/@humanwhocodes/retry": {
-            "version": "0.2.3",
-            "resolved": "https://registry.npmjs.org/@humanwhocodes/retry/-/retry-0.2.3.tgz",
-            "integrity": "sha512-X38nUbachlb01YMlvPFojKoiXq+LzZvuSce70KPMPdeM1Rj03k4dR7lDslhbqXn3Ang4EU3+EAmwEAsbrjHW3g==",
+            "version": "0.4.3",
+            "resolved": "https://registry.npmjs.org/@humanwhocodes/retry/-/retry-0.4.3.tgz",
+            "integrity": "sha512-bV0Tgo9K4hfPCek+aMAn81RppFKv2ySDQeMoSZuvTASywNTnVJCArCZE2FWqpvIatKu7VMRLWlR1EazvVhDyhQ==",
             "dev": true,
+            "license": "Apache-2.0",
             "engines": {
                 "node": ">=18.18"
             },
@@ -159,17 +256,14 @@
             }
         },
         "node_modules/@jridgewell/gen-mapping": {
-            "version": "0.3.5",
-            "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.5.tgz",
-            "integrity": "sha512-IzL8ZoEDIBRWEzlCcRhOaCupYyN5gdIK+Q6fbFdPDg6HqX6jpkItn7DFIpW9LQzXG6Df9sA7+OKnq0qlz/GaQg==",
+            "version": "0.3.13",
+            "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.13.tgz",
+            "integrity": "sha512-2kkt/7niJ6MgEPxF0bYdQ6etZaA+fQvDcLKckhy1yIQOzaoKjBBjSj63/aLVjYE3qhRt5dvM+uUyfCg6UKCBbA==",
             "dev": true,
+            "license": "MIT",
             "dependencies": {
-                "@jridgewell/set-array": "^1.2.1",
-                "@jridgewell/sourcemap-codec": "^1.4.10",
+                "@jridgewell/sourcemap-codec": "^1.5.0",
                 "@jridgewell/trace-mapping": "^0.3.24"
-            },
-            "engines": {
-                "node": ">=6.0.0"
             }
         },
         "node_modules/@jridgewell/resolve-uri": {
@@ -177,85 +271,63 @@
             "resolved": "https://registry.npmjs.org/@jridgewell/resolve-uri/-/resolve-uri-3.1.2.tgz",
             "integrity": "sha512-bRISgCIjP20/tbWSPWMEi54QVPRZExkuD9lJL+UIxUKtwVJA8wW1Trb1jMs1RFXo1CBTNZ/5hpC9QvmKWdopKw==",
             "dev": true,
-            "engines": {
-                "node": ">=6.0.0"
-            }
-        },
-        "node_modules/@jridgewell/set-array": {
-            "version": "1.2.1",
-            "resolved": "https://registry.npmjs.org/@jridgewell/set-array/-/set-array-1.2.1.tgz",
-            "integrity": "sha512-R8gLRTZeyp03ymzP/6Lil/28tGeGEzhx1q2k703KGWRAI1VdvPIXdG70VJc2pAMw3NA6JKL5hhFu1sJX0Mnn/A==",
-            "dev": true,
+            "license": "MIT",
             "engines": {
                 "node": ">=6.0.0"
             }
         },
         "node_modules/@jridgewell/source-map": {
-            "version": "0.3.6",
-            "resolved": "https://registry.npmjs.org/@jridgewell/source-map/-/source-map-0.3.6.tgz",
-            "integrity": "sha512-1ZJTZebgqllO79ue2bm3rIGud/bOe0pP5BjSRCRxxYkEZS8STV7zN84UBbiYu7jy+eCKSnVIUgoWWE/tt+shMQ==",
+            "version": "0.3.11",
+            "resolved": "https://registry.npmjs.org/@jridgewell/source-map/-/source-map-0.3.11.tgz",
+            "integrity": "sha512-ZMp1V8ZFcPG5dIWnQLr3NSI1MiCU7UETdS/A0G8V/XWHvJv3ZsFqutJn1Y5RPmAPX6F3BiE397OqveU/9NCuIA==",
             "dev": true,
+            "license": "MIT",
             "dependencies": {
                 "@jridgewell/gen-mapping": "^0.3.5",
                 "@jridgewell/trace-mapping": "^0.3.25"
             }
         },
         "node_modules/@jridgewell/sourcemap-codec": {
-            "version": "1.4.15",
-            "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.4.15.tgz",
-            "integrity": "sha512-eF2rxCRulEKXHTRiDrDy6erMYWqNw4LPdQ8UQA4huuxaQsVeRPFl2oM8oDGxMFhJUWZf9McpLtJasDDZb/Bpeg==",
-            "dev": true
+            "version": "1.6.0",
+            "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.6.0.tgz",
+            "integrity": "sha512-T7jf+5zgsZHwNJ4lvQ7/aezbyk0nNX+zJVWpmHA7VYsEx7a7qr5Rg5IbtJFqkgze5Y2sruq1RUY8Q837Od7iFw==",
+            "dev": true,
+            "license": "MIT"
         },
         "node_modules/@jridgewell/trace-mapping": {
-            "version": "0.3.25",
-            "resolved": "https://registry.npmjs.org/@jridgewell/trace-mapping/-/trace-mapping-0.3.25.tgz",
-            "integrity": "sha512-vNk6aEwybGtawWmy/PzwnGDOjCkLWSD2wqvjGGAgOAwCGWySYXfYoxt00IJkTF+8Lb57DwOb3Aa0o9CApepiYQ==",
+            "version": "0.3.31",
+            "resolved": "https://registry.npmjs.org/@jridgewell/trace-mapping/-/trace-mapping-0.3.31.tgz",
+            "integrity": "sha512-zzNR+SdQSDJzc8joaeP8QQoCQr8NuYx2dIIytl1QeBEZHJ9uW6hebsrYgbz8hJwUQao3TWCMtmfV8Nu1twOLAw==",
             "dev": true,
+            "license": "MIT",
             "dependencies": {
                 "@jridgewell/resolve-uri": "^3.1.0",
                 "@jridgewell/sourcemap-codec": "^1.4.14"
             }
         },
-        "node_modules/@nodelib/fs.scandir": {
-            "version": "2.1.5",
-            "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz",
-            "integrity": "sha512-vq24Bq3ym5HEQm2NKCr3yXDwjc7vTsEThRDnkp2DK9p1uqLR+DHurm/NOTo0KG7HYHU7eppKZj3MyqYuMBf62g==",
-            "dev": true,
-            "dependencies": {
-                "@nodelib/fs.stat": "2.0.5",
-                "run-parallel": "^1.1.9"
-            },
-            "engines": {
-                "node": ">= 8"
-            }
-        },
-        "node_modules/@nodelib/fs.stat": {
-            "version": "2.0.5",
-            "resolved": "https://registry.npmjs.org/@nodelib/fs.stat/-/fs.stat-2.0.5.tgz",
-            "integrity": "sha512-RkhPPp2zrqDAQA/2jNhnztcPAlv64XdhIp7a7454A5ovI7Bukxgt7MX7udwAu3zg1DcpPU0rz3VV1SeaqvY4+A==",
-            "dev": true,
-            "engines": {
-                "node": ">= 8"
-            }
-        },
-        "node_modules/@nodelib/fs.walk": {
-            "version": "1.2.8",
-            "resolved": "https://registry.npmjs.org/@nodelib/fs.walk/-/fs.walk-1.2.8.tgz",
-            "integrity": "sha512-oGB+UxlgWcgQkgwo8GcEGwemoTFt3FIO9ababBmaGwXIoBKZ+GTy0pP185beGg7Llih/NSHSV2XAs1lnznocSg==",
+        "node_modules/@napi-rs/lzma-linux-x64-gnu": {
+            "version": "1.5.1",
+            "resolved": "https://registry.npmjs.org/@napi-rs/lzma-linux-x64-gnu/-/lzma-linux-x64-gnu-1.5.1.tgz",
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             "dev": true,
+            "license": "MIT",
             "engines": {
                 "node": ">=8"
             },
@@ -2770,6 +3082,7 @@
             "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
             "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
             "dev": true,
+            "license": "MIT",
             "dependencies": {
                 "has-flag": "^4.0.0"
             },
@@ -2782,6 +3095,7 @@
             "resolved": "https://registry.npmjs.org/supports-preserve-symlinks-flag/-/supports-preserve-symlinks-flag-1.0.0.tgz",
             "integrity": "sha512-ot0WnXS9fgdkgIcePe6RHNk1WA8+muPa6cSjeR3V8K27q9BB1rTE3R1p7Hv0z1ZyAc8s6Vvv8DIyWf681MAt0w==",
             "dev": true,
+            "license": "MIT",
             "engines": {
                 "node": ">= 0.4"
             },
@@ -2790,13 +3104,14 @@
             }
         },
         "node_modules/terser": {
-            "version": "5.30.4",
-            "resolved": "https://registry.npmjs.org/terser/-/terser-5.30.4.tgz",
-            "integrity": "sha512-xRdd0v64a8mFK9bnsKVdoNP9GQIKUAaJPTaqEQDL4w/J8WaW4sWXXoMZ+6SimPkfT5bElreXf8m9HnmPc3E1BQ==",
+            "version": "5.51.2",
+            "resolved": "https://registry.npmjs.org/terser/-/terser-5.51.2.tgz",
+            "integrity": "sha512-bWnjSNscmuI+GJze6ZupnHP8G/cTcsJF+bXCeQknk2SHQsgbNJnLrqiH9jZ2W4STPVXH2mDKKRX3iwPhc9Cn/Q==",
             "dev": true,
+            "license": "BSD-2-Clause",
             "dependencies": {
                 "@jridgewell/source-map": "^0.3.3",
-                "acorn": "^8.8.2",
+                "acorn": "^8.15.0",
                 "commander": "^2.20.0",
                 "source-map-support": "~0.5.20"
             },
@@ -2807,23 +3122,12 @@
                 "node": ">=10"
             }
         },
-        "node_modules/terser/node_modules/commander": {
-            "version": "2.20.3",
-            "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.3.tgz",
-            "integrity": "sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==",
-            "dev": true
-        },
-        "node_modules/text-table": {
-            "version": "0.2.0",
-            "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
-            "integrity": "sha512-N+8UisAXDGk8PFXP4HAzVR9nbfmVJ3zYLAWiTIoqC5v5isinhr+r5uaO8+7r3BMfuNIufIsA7RdpVgacC2cSpw==",
-            "dev": true
-        },
         "node_modules/to-regex-range": {
             "version": "5.0.1",
             "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
             "integrity": "sha512-65P7iz6X5yEr1cwcgvQxbbIw7Uk3gOy5dIdtZ4rDveLqhrdJP+Li/Hx6tyK0NEb+2GCyneCMJiGqrADCSNk8sQ==",
             "dev": true,
+            "license": "MIT",
             "dependencies": {
                 "is-number": "^7.0.0"
             },
@@ -2832,16 +3136,18 @@
             }
         },
         "node_modules/tslib": {
-            "version": "2.6.2",
-            "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.6.2.tgz",
-            "integrity": "sha512-AEYxH93jGFPn/a2iVAwW87VuUIkR1FVUKB77NwMF7nBTDkDrrT/Hpt/IrCJ0QXhW27jTBDcf5ZY7w6RiqTMw2Q==",
-            "dev": true
+            "version": "2.8.1",
+            "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
+            "integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
+            "dev": true,
+            "license": "0BSD"
         },
         "node_modules/type-check": {
             "version": "0.4.0",
             "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
             "integrity": "sha512-XleUoc9uwGXqjWwXaUTZAmzMcFZ5858QA2vvx1Ur5xIcixXIP+8LnFDgRplU30us6teqdlskFfu+ae4K79Ooew==",
             "dev": true,
+            "license": "MIT",
             "dependencies": {
                 "prelude-ls": "^1.2.1"
             },
@@ -2850,10 +3156,11 @@
             }
         },
         "node_modules/typescript": {
-            "version": "5.4.5",
-            "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.4.5.tgz",
-            "integrity": "sha512-vcI4UpRgg81oIRUFwR0WSIHKt11nJ7SAVlYNIu+QpqeyXP+gpQJy/Z4+F0aGxSE4MqwjyXvW/TzgkLAx2AGHwQ==",
+            "version": "5.9.3",
+            "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
+            "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
             "dev": true,
+            "license": "Apache-2.0",
             "bin": {
                 "tsc": "bin/tsc",
                 "tsserver": "bin/tsserver"
@@ -2867,6 +3174,7 @@
             "resolved": "https://registry.npmjs.org/unc-path-regex/-/unc-path-regex-0.1.2.tgz",
             "integrity": "sha512-eXL4nmJT7oCpkZsHZUOJo8hcX3GbsiDOa0Qu9F646fi8dT3XuSVopVqAcEiVzSKKH7UoDti23wNX3qGFxcW5Qg==",
             "dev": true,
+            "license": "MIT",
             "engines": {
                 "node": ">=0.10.0"
             }
@@ -2876,6 +3184,7 @@
             "resolved": "https://registry.npmjs.org/underscore.string/-/underscore.string-3.3.6.tgz",
             "integrity": "sha512-VoC83HWXmCrF6rgkyxS9GHv8W9Q5nhMKho+OadDJGzL2oDYbYEppBaCMH6pFlwLeqj2QS+hhkw2kpXkSdD1JxQ==",
             "dev": true,
+            "license": "MIT",
             "dependencies": {
                 "sprintf-js": "^1.1.1",
                 "util-deprecate": "^1.0.2"
@@ -2885,16 +3194,18 @@
             }
         },
         "node_modules/undici-types": {
-            "version": "5.26.5",
-            "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-5.26.5.tgz",
-            "integrity": "sha512-JlCMO+ehdEIKqlFxk6IfVoAUVmgz7cU7zD/h9XZ0qzeosSHmUJVOzSQvvYSYWXkFXC+IfLKSIffhv0sVZup6pA==",
-            "dev": true
+            "version": "8.3.0",
+            "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-8.3.0.tgz",
+            "integrity": "sha512-j375ScV60dom+YkPFIfTLcOiPxkN/buHz5GobjLhixFuANaNs3C9l4GmrWqejgXWJ7BbJcFYpTEUkS1Ge8bpZQ==",
+            "dev": true,
+            "license": "MIT"
         },
         "node_modules/universalify": {
             "version": "0.1.2",
             "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
             "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg==",
             "dev": true,
+            "license": "MIT",
             "engines": {
                 "node": ">= 4.0.0"
             }
@@ -2904,6 +3215,7 @@
             "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz",
             "integrity": "sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==",
             "dev": true,
+            "license": "BSD-2-Clause",
             "dependencies": {
                 "punycode": "^2.1.0"
             }
@@ -2912,18 +3224,17 @@
             "version": "1.0.2",
             "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
             "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
-            "dev": true
+            "dev": true,
+            "license": "MIT"
         },
         "node_modules/v8flags": {
-            "version": "3.2.0",
-            "resolved": "https://registry.npmjs.org/v8flags/-/v8flags-3.2.0.tgz",
-            "integrity": "sha512-mH8etigqMfiGWdeXpaaqGfs6BndypxusHHcv2qSHyZkGEznCd/qAXCWWRzeowtL54147cktFOC4P5y+kl8d8Jg==",
+            "version": "4.0.1",
+            "resolved": "https://registry.npmjs.org/v8flags/-/v8flags-4.0.1.tgz",
+            "integrity": "sha512-fcRLaS4H/hrZk9hYwbdRM35D0U8IYMfEClhXxCivOojl+yTRAZH3Zy2sSy6qVCiGbV9YAtPssP6jaChqC9vPCg==",
             "dev": true,
-            "dependencies": {
-                "homedir-polyfill": "^1.0.1"
-            },
+            "license": "MIT",
             "engines": {
-                "node": ">= 0.10"
+                "node": ">= 10.13.0"
             }
         },
         "node_modules/which": {
@@ -2931,6 +3242,7 @@
             "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
             "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
             "dev": true,
+            "license": "ISC",
             "dependencies": {
                 "isexe": "^2.0.0"
             },
@@ -2946,6 +3258,7 @@
             "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.5.tgz",
             "integrity": "sha512-BN22B5eaMMI9UMtjrGd5g5eCYPpCPDUy0FJXbYsaT5zYxjFOckS53SQDE3pWkVoWpHXVb3BrYcEN4Twa55B5cA==",
             "dev": true,
+            "license": "MIT",
             "engines": {
                 "node": ">=0.10.0"
             }
@@ -2954,13 +3267,15 @@
             "version": "1.0.2",
             "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
             "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
-            "dev": true
+            "dev": true,
+            "license": "ISC"
         },
         "node_modules/yocto-queue": {
             "version": "0.1.0",
             "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
             "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==",
             "dev": true,
+            "license": "MIT",
             "engines": {
                 "node": ">=10"
             },
diff --git a/package.json b/package.json
index da0c1afc..960cd936 100644
--- a/package.json
+++ b/package.json
@@ -43,7 +43,7 @@
         "@eslint/js": "^9.1.1",
         "@rollup/plugin-commonjs": "^25.0.7",
         "@rollup/plugin-node-resolve": "^15.2.3",
-        "@rollup/plugin-terser": "^0.4.4",
+        "@rollup/plugin-terser": "^1.0.0",
         "@types/sax": "^1.2.7",
         "eslint": "^9.1.1",
         "filesaver.js-npm": "latest",

From 9d0cab088500f526bc44d94580eb16b03a369002 Mon Sep 17 00:00:00 2001
From: Casey Occhialini <1508707+littlespex@users.noreply.github.com>
Date: Mon, 31 Aug 2026 15:58:56 -0400
Subject: [PATCH 18/21] update sax to 1.6.1 and refresh dev dependencies

- sax 1.2.1 -> ^1.6.1: hardening against hostile input (quadratic
  CDATA allocation fix, attribute count/depth limits, invalid code
  point checks, stricter char-ref validation in strict mode).
  Note: sax relicensed ISC -> BlueOak-1.0.0 as of 1.4.2.
- @rollup/plugin-commonjs ^29, @rollup/plugin-node-resolve ^16,
  globals ^17: major bumps, no config changes required.
- eslint / @eslint/js floors raised to current 9.x.
- Lockfile regenerated; npm audit reports 0 vulnerabilities.

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
---
 package-lock.json | 152 ++++++++++++++++++++++++++--------------------
 package.json      |  12 ++--
 2 files changed, 92 insertions(+), 72 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index 8f94fff6..2a8b64e9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,17 +9,17 @@
             "version": "1.1.5",
             "license": "BSD-2-Clause",
             "dependencies": {
-                "sax": "1.2.1"
+                "sax": "^1.6.1"
             },
             "devDependencies": {
-                "@eslint/js": "^9.1.1",
-                "@rollup/plugin-commonjs": "^25.0.7",
-                "@rollup/plugin-node-resolve": "^15.2.3",
+                "@eslint/js": "^9.39.5",
+                "@rollup/plugin-commonjs": "^29.0.3",
+                "@rollup/plugin-node-resolve": "^16.0.3",
                 "@rollup/plugin-terser": "^1.0.0",
                 "@types/sax": "^1.2.7",
-                "eslint": "^9.1.1",
+                "eslint": "^9.39.5",
                 "filesaver.js-npm": "latest",
-                "globals": "^15.0.0",
+                "globals": "^17.11.0",
                 "grunt": "latest",
                 "grunt-contrib-clean": "latest",
                 "grunt-exec": "^3.0.0",
@@ -313,6 +313,9 @@
                 "x64"
             ],
             "dev": true,
+            "libc": [
+                "glibc"
+            ],
             "license": "MIT",
             "optional": true,
             "os": [
@@ -323,21 +326,22 @@
             }
         },
         "node_modules/@rollup/plugin-commonjs": {
-            "version": "25.0.8",
-            "resolved": "https://registry.npmjs.org/@rollup/plugin-commonjs/-/plugin-commonjs-25.0.8.tgz",
-            "integrity": "sha512-ZEZWTK5n6Qde0to4vS9Mr5x/0UZoqCxPVR9KRUjU4kA2sO7GEUn1fop0DAwpO6z0Nw/kJON9bDmSxdWxO/TT1A==",
+            "version": "29.0.3",
+            "resolved": "https://registry.npmjs.org/@rollup/plugin-commonjs/-/plugin-commonjs-29.0.3.tgz",
+            "integrity": "sha512-ZaOxZceP7SOUW7Lqw5IRVweSQYWaeIPnXIGLiB690EBA3FGJTO40EEr2L5yZplJWsgTCogILRSpcAe7+U0Otdg==",
             "dev": true,
             "license": "MIT",
             "dependencies": {
                 "@rollup/pluginutils": "^5.0.1",
                 "commondir": "^1.0.1",
                 "estree-walker": "^2.0.2",
-                "glob": "^8.0.3",
+                "fdir": "^6.2.0",
                 "is-reference": "1.2.1",
-                "magic-string": "^0.30.3"
+                "magic-string": "^0.30.3",
+                "picomatch": "^4.0.2"
             },
             "engines": {
-                "node": ">=14.0.0"
+                "node": ">=16.0.0 || 14 >= 14.17"
             },
             "peerDependencies": {
                 "rollup": "^2.68.0||^3.0.0||^4.0.0"
@@ -372,9 +376,9 @@
             }
         },
         "node_modules/@rollup/plugin-node-resolve": {
-            "version": "15.3.1",
-            "resolved": "https://registry.npmjs.org/@rollup/plugin-node-resolve/-/plugin-node-resolve-15.3.1.tgz",
-            "integrity": "sha512-tgg6b91pAybXHJQMAAwW9VuWBO6Thi+q7BCNARLwSqlmsHz0XYURtGvh/AuwSADXSI4h/2uHbs7s4FzlZDGSGA==",
+            "version": "16.0.3",
+            "resolved": "https://registry.npmjs.org/@rollup/plugin-node-resolve/-/plugin-node-resolve-16.0.3.tgz",
+            "integrity": "sha512-lUYM3UBGuM93CnMPG1YocWu7X802BrNF3jW2zny5gQyLQgRFJhV1Sq0Zi74+dh/6NBx1DxFC4b4GXg9wUCG5Qg==",
             "dev": true,
             "license": "MIT",
             "dependencies": {
@@ -534,6 +538,9 @@
                 "arm"
             ],
             "dev": true,
+            "libc": [
+                "glibc"
+            ],
             "license": "MIT",
             "optional": true,
             "os": [
@@ -548,6 +555,9 @@
                 "arm"
             ],
             "dev": true,
+            "libc": [
+                "musl"
+            ],
             "license": "MIT",
             "optional": true,
             "os": [
@@ -562,6 +572,9 @@
                 "arm64"
             ],
             "dev": true,
+            "libc": [
+                "glibc"
+            ],
             "license": "MIT",
             "optional": true,
             "os": [
@@ -576,6 +589,9 @@
                 "arm64"
             ],
             "dev": true,
+            "libc": [
+                "musl"
+            ],
             "license": "MIT",
             "optional": true,
             "os": [
@@ -590,6 +606,9 @@
                 "loong64"
             ],
             "dev": true,
+            "libc": [
+                "glibc"
+            ],
             "license": "MIT",
             "optional": true,
             "os": [
@@ -604,6 +623,9 @@
                 "loong64"
             ],
             "dev": true,
+            "libc": [
+                "musl"
+            ],
             "license": "MIT",
             "optional": true,
             "os": [
@@ -618,6 +640,9 @@
                 "ppc64"
             ],
             "dev": true,
+            "libc": [
+                "glibc"
+            ],
             "license": "MIT",
             "optional": true,
             "os": [
@@ -632,6 +657,9 @@
                 "ppc64"
             ],
             "dev": true,
+            "libc": [
+                "musl"
+            ],
             "license": "MIT",
             "optional": true,
             "os": [
@@ -646,6 +674,9 @@
                 "riscv64"
             ],
             "dev": true,
+            "libc": [
+                "glibc"
+            ],
             "license": "MIT",
             "optional": true,
             "os": [
@@ -660,6 +691,9 @@
                 "riscv64"
             ],
             "dev": true,
+            "libc": [
+                "musl"
+            ],
             "license": "MIT",
             "optional": true,
             "os": [
@@ -674,6 +708,9 @@
                 "s390x"
             ],
             "dev": true,
+            "libc": [
+                "glibc"
+            ],
             "license": "MIT",
             "optional": true,
             "os": [
@@ -688,6 +725,9 @@
                 "x64"
             ],
             "dev": true,
+            "libc": [
+                "glibc"
+            ],
             "license": "MIT",
             "optional": true,
             "os": [
@@ -702,6 +742,9 @@
                 "x64"
             ],
             "dev": true,
+            "libc": [
+                "musl"
+            ],
             "license": "MIT",
             "optional": true,
             "os": [
@@ -1389,6 +1432,24 @@
             "dev": true,
             "license": "MIT"
         },
+        "node_modules/fdir": {
+            "version": "6.5.0",
+            "resolved": "https://registry.npmjs.org/fdir/-/fdir-6.5.0.tgz",
+            "integrity": "sha512-tIbYtZbucOs0BRGqPJkshJUYdL+SDH7dVM8gjy+ERp3WAUjLEFJE+02kanyHtwjWOnwrKYBiwAmM0p4kLJAnXg==",
+            "dev": true,
+            "license": "MIT",
+            "engines": {
+                "node": ">=12.0.0"
+            },
+            "peerDependencies": {
+                "picomatch": "^3 || ^4"
+            },
+            "peerDependenciesMeta": {
+                "picomatch": {
+                    "optional": true
+                }
+            }
+        },
         "node_modules/file-entry-cache": {
             "version": "8.0.0",
             "resolved": "https://registry.npmjs.org/file-entry-cache/-/file-entry-cache-8.0.0.tgz",
@@ -1579,27 +1640,6 @@
                 "node": ">=10"
             }
         },
-        "node_modules/glob": {
-            "version": "8.1.0",
-            "resolved": "https://registry.npmjs.org/glob/-/glob-8.1.0.tgz",
-            "integrity": "sha512-r8hpEjiQEYlF2QU0df3dS+nxxSIreXQS1qRhMJM0Q5NDdR386C7jb7Hwwod8Fgiuex+k0GFjgft18yvxm5XoCQ==",
-            "deprecated": "Old versions of glob are not supported, and contain widely publicized security vulnerabilities, which have been fixed in the current version. Please update. Support for old versions may be purchased (at exorbitant rates) by contacting i@izs.me",
-            "dev": true,
-            "license": "ISC",
-            "dependencies": {
-                "fs.realpath": "^1.0.0",
-                "inflight": "^1.0.4",
-                "inherits": "2",
-                "minimatch": "^5.0.1",
-                "once": "^1.3.0"
-            },
-            "engines": {
-                "node": ">=12"
-            },
-            "funding": {
-                "url": "https://github.com/sponsors/isaacs"
-            }
-        },
         "node_modules/glob-parent": {
             "version": "6.0.2",
             "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-6.0.2.tgz",
@@ -1613,29 +1653,6 @@
                 "node": ">=10.13.0"
             }
         },
-        "node_modules/glob/node_modules/brace-expansion": {
-            "version": "2.1.4",
-            "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.1.4.tgz",
-            "integrity": "sha512-hGfVzPxthbf3+2yjg/RBs60cB0FhqBS/zvdV/4wn4/BmN0bNMMHPc4V/BbFieqf1TKAGGAHnY4eSjajCl0f2Xg==",
-            "dev": true,
-            "license": "MIT",
-            "dependencies": {
-                "balanced-match": "^1.0.0"
-            }
-        },
-        "node_modules/glob/node_modules/minimatch": {
-            "version": "5.1.9",
-            "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-5.1.9.tgz",
-            "integrity": "sha512-7o1wEA2RyMP7Iu7GNba9vc0RWWGACJOCZBJX2GJWip0ikV+wcOsgVuY9uE8CPiyQhkGFSlhuSkZPavN7u1c2Fw==",
-            "dev": true,
-            "license": "ISC",
-            "dependencies": {
-                "brace-expansion": "^2.0.1"
-            },
-            "engines": {
-                "node": ">=10"
-            }
-        },
         "node_modules/global-modules": {
             "version": "1.0.0",
             "resolved": "https://registry.npmjs.org/global-modules/-/global-modules-1.0.0.tgz",
@@ -1682,9 +1699,9 @@
             }
         },
         "node_modules/globals": {
-            "version": "15.15.0",
-            "resolved": "https://registry.npmjs.org/globals/-/globals-15.15.0.tgz",
-            "integrity": "sha512-7ACyT3wmyp3I61S4fG682L0VA2RGD9otkqGJIwNUMF1SWUombIIk+af1unuDYgMm082aHYwD+mzJvv9Iu8dsgg==",
+            "version": "17.11.0",
+            "resolved": "https://registry.npmjs.org/globals/-/globals-17.11.0.tgz",
+            "integrity": "sha512-Z2I8hM+PbJDXQDq3Icgpzv+mPdwr68iZUU9d5WW4FuXfDUQfkZaZuvjMv42/5crNyw154+9+VWXbYrUgDXbxNw==",
             "dev": true,
             "license": "MIT",
             "engines": {
@@ -2971,10 +2988,13 @@
             "license": "MIT"
         },
         "node_modules/sax": {
-            "version": "1.2.1",
-            "resolved": "https://registry.npmjs.org/sax/-/sax-1.2.1.tgz",
-            "integrity": "sha512-8I2a3LovHTOpm7NV5yOyO8IHqgVsfK4+UuySrXU8YXkSRX7k6hCV9b3HrkKCr3nMpgj+0bmocaJJWpvp1oc7ZA==",
-            "license": "ISC"
+            "version": "1.6.1",
+            "resolved": "https://registry.npmjs.org/sax/-/sax-1.6.1.tgz",
+            "integrity": "sha512-42tBVwLWnaQvW5zc4HbZrTuWccECCZfBi92FDuwtqxasH+JbPB3/FOKb1m222K42R4WxuxzzMsTswfzgtSu64Q==",
+            "license": "BlueOak-1.0.0",
+            "engines": {
+                "node": ">=11.0.0"
+            }
         },
         "node_modules/serialize-javascript": {
             "version": "7.1.1",
diff --git a/package.json b/package.json
index 960cd936..4e50e98b 100644
--- a/package.json
+++ b/package.json
@@ -37,17 +37,17 @@
         "test": "node --test ./src/test/js/*Test.js"
     },
     "dependencies": {
-        "sax": "1.2.1"
+        "sax": "^1.6.1"
     },
     "devDependencies": {
-        "@eslint/js": "^9.1.1",
-        "@rollup/plugin-commonjs": "^25.0.7",
-        "@rollup/plugin-node-resolve": "^15.2.3",
+        "@eslint/js": "^9.39.5",
+        "@rollup/plugin-commonjs": "^29.0.3",
+        "@rollup/plugin-node-resolve": "^16.0.3",
         "@rollup/plugin-terser": "^1.0.0",
         "@types/sax": "^1.2.7",
-        "eslint": "^9.1.1",
+        "eslint": "^9.39.5",
         "filesaver.js-npm": "latest",
-        "globals": "^15.0.0",
+        "globals": "^17.11.0",
         "grunt": "latest",
         "grunt-contrib-clean": "latest",
         "grunt-exec": "^3.0.0",

From 665e022128514a4449dd69499f146cd36e50af32 Mon Sep 17 00:00:00 2001
From: Casey Occhialini <1508707+littlespex@users.noreply.github.com>
Date: Tue, 1 Sep 2026 11:26:15 -0400
Subject: [PATCH 19/21] feat: parameterizes the XML parser, allowing the use of
 the native browser DOMParser

Closes https://github.com/sandflow/imscJS/issues/242

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Co-authored-by: Pierre-Anthony Lemieux <pal@sandflow.com>
---
 Gruntfile.cjs                         |   3 -
 package-lock.json                     |  34 +-------
 package.json                          |  26 ++++--
 properties.json                       |   2 -
 rollup.config.js                      |  35 --------
 src/main/js/doc.js                    |  23 +++---
 src/main/js/dom_to_parser.js          | 115 ++++++++++++++++++++++++++
 src/main/js/isd.js                    |   2 +-
 src/main/js/main.js                   |  26 +++++-
 src/main/js/parser.js                 |  61 ++++++++++++++
 src/test/js/RequiredParserTest.js     |  22 +++++
 src/test/js/utils/getIMSC1Document.js |   5 +-
 src/test/js/utils/saxParser.js        |  16 ++++
 src/test/webapp/gen-renders.html      |   5 +-
 tsconfig.json                         |   1 +
 15 files changed, 282 insertions(+), 94 deletions(-)
 create mode 100644 src/main/js/dom_to_parser.js
 create mode 100644 src/main/js/parser.js
 create mode 100644 src/test/js/RequiredParserTest.js
 create mode 100644 src/test/js/utils/saxParser.js

diff --git a/Gruntfile.cjs b/Gruntfile.cjs
index 1d4a45fd..e568c534 100644
--- a/Gruntfile.cjs
+++ b/Gruntfile.cjs
@@ -39,7 +39,6 @@ module.exports = function (grunt) {
             default: {
                 files: {
                     "<%= properties.webappBuildDir %>/libs/": [
-                        "sax:main",
                         "filesaver.js-npm:main",
                         "jszip/dist/jszip.js",
                     ],
@@ -80,6 +79,4 @@ module.exports = function (grunt) {
 
     grunt.registerTask("build", ["build:debug"]);
 
-    grunt.registerTask("clean", ["clean"]);
-
 };
diff --git a/package-lock.json b/package-lock.json
index 2a8b64e9..e689368f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,14 +9,13 @@
             "version": "1.1.5",
             "license": "BSD-2-Clause",
             "dependencies": {
-                "sax": "^1.6.1"
+                "tslib": "^2.6.2"
             },
             "devDependencies": {
                 "@eslint/js": "^9.39.5",
                 "@rollup/plugin-commonjs": "^29.0.3",
                 "@rollup/plugin-node-resolve": "^16.0.3",
                 "@rollup/plugin-terser": "^1.0.0",
-                "@types/sax": "^1.2.7",
                 "eslint": "^9.39.5",
                 "filesaver.js-npm": "latest",
                 "globals": "^17.11.0",
@@ -28,7 +27,7 @@
                 "jszip": "latest",
                 "rollup": "^4.14.3",
                 "rollup-plugin-polyfill-node": "^0.13.0",
-                "tslib": "^2.6.2",
+                "sax": "^1.6.1",
                 "typescript": "^5.4.5"
             }
         },
@@ -849,16 +848,6 @@
             "dev": true,
             "license": "MIT"
         },
-        "node_modules/@types/node": {
-            "version": "26.4.0",
-            "resolved": "https://registry.npmjs.org/@types/node/-/node-26.4.0.tgz",
-            "integrity": "sha512-faiGnoIrLH/V8cibOMEAZ8pMw6oXqSukl29ra4mN8GdaB2ZewzeaLj+INpV5N+Z1eKWzY+IzaIZH2EIR6YZRNQ==",
-            "dev": true,
-            "license": "MIT",
-            "dependencies": {
-                "undici-types": "~8.3.0"
-            }
-        },
         "node_modules/@types/resolve": {
             "version": "1.20.2",
             "resolved": "https://registry.npmjs.org/@types/resolve/-/resolve-1.20.2.tgz",
@@ -866,16 +855,6 @@
             "dev": true,
             "license": "MIT"
         },
-        "node_modules/@types/sax": {
-            "version": "1.2.7",
-            "resolved": "https://registry.npmjs.org/@types/sax/-/sax-1.2.7.tgz",
-            "integrity": "sha512-rO73L89PJxeYM3s3pPPjiPgVVcymqU490g0YO5n5By0k2Erzj6tay/4lr1CHAAU4JyOWd1rpQ8bCf6cZfHU96A==",
-            "dev": true,
-            "license": "MIT",
-            "dependencies": {
-                "@types/node": "*"
-            }
-        },
         "node_modules/abbrev": {
             "version": "1.1.1",
             "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
@@ -2991,6 +2970,7 @@
             "version": "1.6.1",
             "resolved": "https://registry.npmjs.org/sax/-/sax-1.6.1.tgz",
             "integrity": "sha512-42tBVwLWnaQvW5zc4HbZrTuWccECCZfBi92FDuwtqxasH+JbPB3/FOKb1m222K42R4WxuxzzMsTswfzgtSu64Q==",
+            "dev": true,
             "license": "BlueOak-1.0.0",
             "engines": {
                 "node": ">=11.0.0"
@@ -3159,7 +3139,6 @@
             "version": "2.8.1",
             "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
             "integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
-            "dev": true,
             "license": "0BSD"
         },
         "node_modules/type-check": {
@@ -3213,13 +3192,6 @@
                 "node": "*"
             }
         },
-        "node_modules/undici-types": {
-            "version": "8.3.0",
-            "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-8.3.0.tgz",
-            "integrity": "sha512-j375ScV60dom+YkPFIfTLcOiPxkN/buHz5GobjLhixFuANaNs3C9l4GmrWqejgXWJ7BbJcFYpTEUkS1Ge8bpZQ==",
-            "dev": true,
-            "license": "MIT"
-        },
         "node_modules/universalify": {
             "version": "0.1.2",
             "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
diff --git a/package.json b/package.json
index 4e50e98b..42785526 100644
--- a/package.json
+++ b/package.json
@@ -25,9 +25,26 @@
         "imsc"
     ],
     "author": "Pierre-Anthony Lemieux <pal@sandflow.com>",
-    "main": "dist/main/js/main.js",
-    "types": "dist/main/js/main.d.ts",
+    "main": "dist/main/main.js",
+    "types": "dist/main/main.d.ts",
     "unpkg": "dist/imsc.min.js",
+    "sideEffects": false,
+    "exports": {
+        ".": {
+            "types": "./dist/main/main.d.ts",
+            "default": "./dist/main/main.js"
+        },
+        "./*.js": {
+            "types": "./dist/main/*.d.ts",
+            "default": "./dist/main/*.js"
+        },
+        "./*": {
+            "types": "./dist/main/*.d.ts",
+            "default": "./dist/main/*.js"
+        },
+        "./dist/*": "./dist/*",
+        "./package.json": "./package.json"
+    },
     "scripts": {
         "prepublishOnly": "grunt build:release",
         "dev": "npx http-server build/public_html",
@@ -37,14 +54,13 @@
         "test": "node --test ./src/test/js/*Test.js"
     },
     "dependencies": {
-        "sax": "^1.6.1"
+        "tslib": "^2.6.2"
     },
     "devDependencies": {
         "@eslint/js": "^9.39.5",
         "@rollup/plugin-commonjs": "^29.0.3",
         "@rollup/plugin-node-resolve": "^16.0.3",
         "@rollup/plugin-terser": "^1.0.0",
-        "@types/sax": "^1.2.7",
         "eslint": "^9.39.5",
         "filesaver.js-npm": "latest",
         "globals": "^17.11.0",
@@ -56,7 +72,7 @@
         "jszip": "latest",
         "rollup": "^4.14.3",
         "rollup-plugin-polyfill-node": "^0.13.0",
-        "tslib": "^2.6.2",
+        "sax": "^1.6.1",
         "typescript": "^5.4.5"
     }
 }
diff --git a/properties.json b/properties.json
index ab796296..39e4f924 100644
--- a/properties.json
+++ b/properties.json
@@ -4,8 +4,6 @@
     "webappBuildDir" : "build/public_html",
     "unitTestsResourcesDir" : "src/test/resources",
     "umdBuildDir" : "dist",
-    "umdAllDebugName" : "imsc.all.debug.js",
     "umdDebugName" : "imsc.debug.js",
-    "umdAllMinName" : "imsc.all.min.js",
     "umdMinName" : "imsc.min.js"
 }
diff --git a/rollup.config.js b/rollup.config.js
index c3339f46..8adc92ea 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -4,10 +4,8 @@ import terser from "@rollup/plugin-terser";
 import nodePolyfill from "rollup-plugin-polyfill-node";
 
 export default [
-  // debug
   {
     input: "dist/main/main.js",
-    external: ["sax"],
     plugins: [
       commonjs({
         sourceMap: true,
@@ -23,44 +21,11 @@ export default [
       format: "umd",
       name: "imsc",
       sourcemap: true,
-      globals: {
-        sax: "sax",
-      },
     }, {
       file: "dist/imsc.min.js",
       format: "umd",
       name: "imsc",
       sourcemap: true,
-      globals: {
-        sax: "sax",
-      },
-      plugins: [terser()],
-    }],
-  },
-
-  // all
-  {
-    input: "dist/main/main.js",
-    plugins: [
-      commonjs({
-        sourceMap: true,
-      }),
-      nodeResolve({
-        preferBuiltins: true,
-        browser: true,
-      }),
-      nodePolyfill(),
-    ],
-    output: [{
-      file: "dist/imsc.all.debug.js",
-      format: "umd",
-      name: "imsc",
-      sourcemap: true,
-    }, {
-      file: "dist/imsc.all.min.js",
-      format: "umd",
-      name: "imsc",
-      sourcemap: true,
       plugins: [terser()],
     }],
   },
diff --git a/src/main/js/doc.js b/src/main/js/doc.js
index f6420062..3cd709f4 100644
--- a/src/main/js/doc.js
+++ b/src/main/js/doc.js
@@ -24,7 +24,6 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-import sax from "sax";
 import { reportError, reportFatal, reportWarning } from "./error.js";
 import { ns_ebutts, ns_ittp, ns_itts, ns_tt, ns_ttp, ns_tts } from "./names.js";
 import { byName, byQName } from "./styles.js";
@@ -36,10 +35,8 @@ import { ComputedLength, hasOwnProperty, parseLength } from "./utils.js";
 
 /**
  * @typedef {import("./error").ErrorHandler} ErrorHandler
- */
-
-/**
- * @typedef {sax.Tag | sax.QualifiedTag} Node
+ * @typedef {import("./parser").Node} Node
+ * @typedef {import("./parser").Parser} Parser
  */
 
 /**
@@ -80,18 +77,22 @@ import { ComputedLength, hasOwnProperty, parseLength } from "./utils.js";
  * @param {string} xmlstring XML document
  * @param {ErrorHandler} errorHandler Error callback
  * @param {?MetadataHandler} metadataHandler Callback for <Metadata> elements
+ * @param {Parser} parser XML parser
  * @returns {?TT} Opaque in-memory representation of an IMSC1 document
  */
 
-export function fromXML(xmlstring, errorHandler, metadataHandler) {
-    const p = sax.parser(true, { xmlns: true });
+export function fromParser(xmlstring, errorHandler, metadataHandler, parser) {
+    if (!parser) {
+        reportFatal(errorHandler, "No parser provided");
+    }
+
     const estack = [];
     const xmllangstack = [];
     const xmlspacestack = [];
     let metadata_depth = 0;
     let doc = null;
 
-    p.onclosetag = function () {
+    parser.onclosetag = function () {
 
         if (estack[0] instanceof Region) {
 
@@ -191,7 +192,7 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
         estack.shift();
     };
 
-    p.ontext = function (str) {
+    parser.ontext = function (str) {
 
         if (estack[0] === undefined) {
 
@@ -234,7 +235,7 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
 
     };
 
-    p.onopentag = function (node) {
+    parser.onopentag = function (node) {
 
         // maintain the xml:space stack
 
@@ -604,7 +605,7 @@ export function fromXML(xmlstring, errorHandler, metadataHandler) {
 
     // parse the document
 
-    p.write(xmlstring).close();
+    parser.write(xmlstring).close();
 
     // all referential styling has been flatten, so delete styles
 
diff --git a/src/main/js/dom_to_parser.js b/src/main/js/dom_to_parser.js
new file mode 100644
index 00000000..7755bc0d
--- /dev/null
+++ b/src/main/js/dom_to_parser.js
@@ -0,0 +1,115 @@
+/*
+ * Copyright (c) Sandflow Consulting LLC
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ *   list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * Implements an XML parser from the web browser's DOMParser
+ *
+ * @module parser
+ */
+
+/**
+ * @typedef {import("./parser.js").Node} Node
+ * @typedef {import("./parser.js").Parser} Parser
+ * @typedef {import("./parser.js").Attribute} Attribute
+ */
+
+export class XMLParser {
+  /**
+   * @param {Element} element
+   * @returns {Node}
+   */
+  static toNode(element) {
+    const attrs = element.attributes;
+    const node = XMLParser.toNS(element);
+    node.attributes = {};
+
+    for (let i = 0, len = attrs.length; i < len; i++) {
+      const attr = attrs[i];
+      node.attributes[attr.name] = XMLParser.toNS(attr);
+    }
+
+    return node;
+  }
+
+  static toNS(node) {
+    return {
+      name: node.nodeName,
+      prefix: node.prefix,
+      local: node.localName,
+      uri: node.namespaceURI,
+      value: node.value,
+    };
+  }
+
+  onopentag = (node) => { console.log(node); }
+  ontext = (str) => { console.log(str); }
+  onclosetag = () => { }
+
+  write(xmlstring) {
+    const parser = new DOMParser();
+    const doc = parser.parseFromString(xmlstring, "application/xml");
+    const errorNode = doc.querySelector("parsererror");
+
+    if (errorNode) {
+      throw new Error("XML parsing error: " + errorNode.textContent);
+    }
+
+    this.process(doc.documentElement);
+
+    return this;
+  }
+
+  process(element) {
+    const node = XMLParser.toNode(element);
+    this.onopentag(node);
+
+    const children = element.childNodes;
+
+    for (let i = 0, len = children.length; i < len; i++) {
+      const child = children[i];
+
+      if (child.nodeType === Node.TEXT_NODE) {
+        this.ontext(child.textContent);
+      } else if (child.nodeType === Node.ELEMENT_NODE) {
+        this.process(child);
+      }
+    }
+
+    this.onclosetag();
+  }
+
+  close() {
+    return this;
+  }
+}
+
+/**
+ * @returns {Parser}
+ */
+export function createSAXParserFromDOMParser() {
+  return new XMLParser();
+}
+
diff --git a/src/main/js/isd.js b/src/main/js/isd.js
index f3e677ad..11b6fe27 100644
--- a/src/main/js/isd.js
+++ b/src/main/js/isd.js
@@ -38,7 +38,7 @@ import { ComputedLength, hasOwnProperty } from "./utils.js";
  */
 
 /**
- * Creates a canonical representation of an IMSC1 document returned by <pre>imscDoc.fromXML()</pre>
+ * Creates a canonical representation of an IMSC1 document returned by <pre>fromXML()</pre>
  * at a given absolute offset in seconds. This offset does not have to be one of the values returned
  * by <pre>getMediaTimeEvents()</pre>.
  *
diff --git a/src/main/js/main.js b/src/main/js/main.js
index 0a093b7d..ca832e9c 100644
--- a/src/main/js/main.js
+++ b/src/main/js/main.js
@@ -24,6 +24,30 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-export { fromXML } from "./doc.js";
+import { fromParser } from "./doc.js";
+import { createSAXParserFromDOMParser } from "./dom_to_parser.js";
+
 export { renderHTML } from "./html.js";
 export { generateISD } from "./isd.js";
+export { createSAXParserFromDOMParser };
+
+/**
+ * @typedef {import("./error.js").ErrorHandler} ErrorHandler
+ * @typedef {import("./doc.js").MetadataHandler} MetadataHandler
+ * @typedef {import("./doc.js").TT} TT
+ * @typedef {import("./parser.js").Parser} Parser
+ */
+
+/**
+ * Parses an IMSC1 document into an opaque in-memory representation, using the
+ * DOMParser-backed parser unless a parser is provided.
+ *
+ * @param {string} xmlstring XML document
+ * @param {ErrorHandler} errorHandler Error callback
+ * @param {?MetadataHandler} metadataHandler Callback for <Metadata> elements
+ * @param {?Parser} parser XML parser
+ * @returns {?TT} Opaque in-memory representation of an IMSC1 document
+ */
+export function fromXML(xmlstring, errorHandler, metadataHandler, parser = createSAXParserFromDOMParser()) {
+    return fromParser(xmlstring, errorHandler, metadataHandler, parser);
+}
diff --git a/src/main/js/parser.js b/src/main/js/parser.js
new file mode 100644
index 00000000..4d6d6d29
--- /dev/null
+++ b/src/main/js/parser.js
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) Sandflow Consulting LLC
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ *   list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * Defines the contract for the parser expected by doc.js
+ *
+ * @module parser
+ */
+
+/**
+ * @typedef {Object} Attribute
+ * @property {string} name
+ * @property {?string} prefix
+ * @property {?string} local
+ * @property {?string} uri
+ * @property {?string} value
+ */
+
+/**
+ * @typedef {Object} Node
+ * @property {string} name
+ * @property {?string} prefix
+ * @property {?string} local
+ * @property {?string} uri
+ * @property {?string} value
+ * @property {Object.<string, Attribute>} attributes
+ */
+
+/**
+ * @typedef {Object} Parser
+ * @property {(xml: string) => Parser} write
+ * @property {() => Parser} close
+ * @property {(node: Node) => void} onopentag
+ * @property {(text: string) => void} ontext
+ * @property {() => void} onclosetag
+ */
+
+export {};
diff --git a/src/test/js/RequiredParserTest.js b/src/test/js/RequiredParserTest.js
new file mode 100644
index 00000000..54e63ca8
--- /dev/null
+++ b/src/test/js/RequiredParserTest.js
@@ -0,0 +1,22 @@
+import { equal, throws } from "node:assert";
+import { test } from "node:test";
+import { fromParser } from "../../main/js/doc.js";
+
+const XML = '<tt xmlns="http://www.w3.org/ns/ttml" xml:lang="en"><body><div><p>hello</p></div></body></tt>';
+
+test("fromParser requires a parser", () => {
+
+  let fatal_msg = null;
+
+  const errorHandler = {
+    info: function () { },
+    warn: function () { },
+    error: function () { },
+    fatal: function (msg) { fatal_msg = msg; },
+  };
+
+  throws(() => fromParser(XML, errorHandler));
+
+  equal(fatal_msg, "No parser provided");
+
+});
diff --git a/src/test/js/utils/getIMSC1Document.js b/src/test/js/utils/getIMSC1Document.js
index 51d5fe70..b1f94ec9 100644
--- a/src/test/js/utils/getIMSC1Document.js
+++ b/src/test/js/utils/getIMSC1Document.js
@@ -1,5 +1,6 @@
 import fs from "node:fs/promises";
-import { fromXML } from "../../../main/js/doc.js";
+import { fromParser } from "../../../main/js/doc.js";
+import { createSAXParser } from "./saxParser.js";
 
 const errorHandler = {
   info: function (msg) {
@@ -18,5 +19,5 @@ const errorHandler = {
 
 export async function getIMSC1Document(url, metadataHandler) {
   const contents = await fs.readFile(url, "utf8");
-  return fromXML(contents, errorHandler, metadataHandler);
+  return fromParser(contents, errorHandler, metadataHandler, createSAXParser());
 }
diff --git a/src/test/js/utils/saxParser.js b/src/test/js/utils/saxParser.js
new file mode 100644
index 00000000..7fafa638
--- /dev/null
+++ b/src/test/js/utils/saxParser.js
@@ -0,0 +1,16 @@
+import sax from "sax";
+
+/**
+ * @typedef {import("../../../main/js/parser.js").Parser} Parser
+ */
+
+/**
+ * Creates a sax-based parser for use in the unit tests, which run in node,
+ * where the DOMParser global required by the default DOM parser does not
+ * exist. The library itself is browser-only and does not use sax.
+ *
+ * @returns {Parser}
+ */
+export function createSAXParser() {
+  return sax.parser(true, { xmlns: true });
+}
diff --git a/src/test/webapp/gen-renders.html b/src/test/webapp/gen-renders.html
index 68726056..76ad260f 100644
--- a/src/test/webapp/gen-renders.html
+++ b/src/test/webapp/gen-renders.html
@@ -9,7 +9,6 @@
 
     <script src="libs/FileSaver.js"></script>
     <script src="libs/jszip.js"></script>
-    <script src="libs/sax.js"></script>
     <script src="libs/imsc.js"></script>
     <script src="js/reffiles.js"></script>
     <script src="js/gen-renders.js"></script>
@@ -20,9 +19,9 @@
     <div id="main">
 
         <section id="start">
-            <button id="start-rendering" onclick="generateRenders('imsc-tests/imsc1')">Generate IMSC 1 reference
+            <button onclick="generateRenders('imsc-tests/imsc1')">Generate IMSC 1 reference
                 renders</button>
-            <button id="start-rendering" onclick="generateRenders('imsc-tests/imsc1_1')">Generate IMSC 1.1 reference
+            <button onclick="generateRenders('imsc-tests/imsc1_1')">Generate IMSC 1.1 reference
                 renders</button>
         </section>
 
diff --git a/tsconfig.json b/tsconfig.json
index 8a728db1..bdb4e028 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -36,6 +36,7 @@
     "strictNullChecks": true,
     "strictPropertyInitialization": true,
     "target": "ES5",
+    "types": [],
   },
   "include": [
     "src/main"

From 6cd0ac728bfc155c069771bb22804be65300781a Mon Sep 17 00:00:00 2001
From: Casey Occhialini <1508707+littlespex@users.noreply.github.com>
Date: Tue, 1 Sep 2026 12:07:09 -0400
Subject: [PATCH 20/21] docs: remove stale sax.js references from README

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
---
 README.md | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/README.md b/README.md
index 8ebf4629..39fb7ef6 100644
--- a/README.md
+++ b/README.md
@@ -32,7 +32,7 @@ imscJS bugs are tracked at https://github.com/sandflow/imscJS/issues.
 RUNTIME DEPENDENCIES
 ====================
 
-(required) [sax-js 1.2.1](https://www.npmjs.com/package/sax)
+imscJS requires an XML parser. By default it uses the browser's native [`DOMParser`](https://developer.mozilla.org/en-US/docs/Web/API/DOMParser), so no additional library is needed in a browser environment. In environments where `DOMParser` is not available, e.g. Node.js, the caller must provide `fromXML()` with a parser that implements the contract defined in [src/main/js/parser.js](src/main/js/parser.js), e.g. [sax-js](https://www.npmjs.com/package/sax).
 
 Rendering to HTML5 requires a browser environment, but parsing an IMSC document and transforming it into ISDs does not.
 
@@ -52,10 +52,9 @@ QUICK START
 
 * run the `build` target defined in [Gruntfile.cjs](./Gruntfile.cjs) using [grunt](http://gruntjs.com/).
 
-* the resulting `imsc.js` and `sax.js` files at `build/public_html/libs` are, respectively, the imscJS library and its sax-js dependency. For example, both libraries can be included in a web page as follows:
+* the resulting `imsc.js` file at `build/public_html/libs` is the imscJS library. For example, it can be included in a web page as follows:
 
 ```html
-    <script src="libs/sax.js"></script>
     <script src="libs/imsc.js"></script>
 ```
 
@@ -71,7 +70,7 @@ API
 
 imscJS renders an IMSC document in three distinct steps:
 
-* `fromXML(xmlstring, errorHandler, metadataHandler)` parses the document and returns a TT object. The latter contains opaque representation of the document and exposes the method `getMediaTimeEvents()` that returns a list of time offsets (in seconds) of the ISD, i.e. the points in time where the visual representation of the document change.
+* `fromXML(xmlstring, errorHandler, metadataHandler, parser)` parses the document and returns a TT object. The latter contains opaque representation of the document and exposes the method `getMediaTimeEvents()` that returns a list of time offsets (in seconds) of the ISD, i.e. the points in time where the visual representation of the document change. The optional `parser` argument allows the caller to provide an alternative XML parser, e.g. in environments where the browser's native `DOMParser` is not available.
 
 * `generateISD(tt, offset, errorHandler)` creates a canonical representation of the document (provided as a TT object generated by `fromXML()`) at a point in time (`offset` parameter). This point in time does not have to be one of the values returned by `getMediaTimeEvents()`. For example, given an ISOBMFF sample covering the interval `[a, b[`, `generateISD(tt, offset, errorHandler)` would be called first with `offset = a`, then in turn with offset set to each value of `getMediaTimeEvents()` that fall in the interval `]a, b[`.
 
@@ -104,12 +103,11 @@ BUILD
 imscJS is built using the `build:release` or `build:debug` Grunt tasks -- the `build` task is an alias of `build:debug`.
 
 The `dist` directory contains the following build artifacts:
-* `imsc.all.debug.js`: Non-minified build that includes the sax-js dependency.
-* `imsc.all.min.js`: Minified build that includes the sax-js dependency.
-* `imsc.debug.js`: Non-minified build that does not include the sax-js dependency.
-* `imsc.min.js`: Minified build that does not include the sax-js dependency.
+* `imsc.debug.js`: Non-minified UMD build.
+* `imsc.min.js`: Minified UMD build.
+* `main/`: ES modules and TypeScript type declarations, used when the library is imported as an NPM package.
 
-The `build/public_html/libs/imsc.js` files is identical to:
+The `build/public_html/libs/imsc.js` file is identical to:
 * `imsc.debug.js`, if the `build:debug` task is executed.
 * `imsc.min.js`, if the `build:release` task is executed.
 

From ede2bb9b6ddf223f8a2fd2ce44d31eef1d7505ad Mon Sep 17 00:00:00 2001
From: Pierre-Anthony Lemieux <pal@palemieux.com>
Date: Tue, 1 Sep 2026 09:11:12 -0700
Subject: [PATCH 21/21] Bump to 2.0.0-dev.1

---
 package.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package.json b/package.json
index 42785526..ceb31f73 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
     "name": "imsc",
     "description": "Renders IMSC documents to HTML5 fragments",
-    "version": "1.1.5",
+    "version": "2.0.0-dev.1",
     "license": "BSD-2-Clause",
     "homepage": "https://github.com/sandflow/imscJS",
     "bugs": "https://github.com/sandflow/imscJS/issues",