From 4a289750a137d03d88e6bd026612c34a29baf9dd Mon Sep 17 00:00:00 2001
From: erseco <info@ernesto.es>
Date: Tue, 28 Jul 2026 16:13:01 +0100
Subject: [PATCH 1/7] Show a loading spinner while an embedded package paints
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The block renders an iframe that has to download, parse and lay out a whole
package before anything appears, so a visitor sees an empty bordered frame
for a noticeable moment and cannot tell whether it is loading or broken.
Large packages make it worse.

Cover that gap with a spinner overlaying the frame. It is revealed by the
script itself, never server-side, so a visitor without JavaScript never gets
an overlay that nothing could clear. It is announced with role="status" so
it is not a silent animation, respects prefers-reduced-motion, and clears on
the iframe's load event plus a short delay, because the theme builds its
navigation right after load and clearing immediately can uncover a frame
that is still blank. A 20 s timeout is the backstop for an embed whose load
event never fires.

The behavior ships as one enqueued asset rather than an inline <script> per
block: five embeds on a page would otherwise ship five uncached copies of
the same IIFE, and inline script is the first thing a hardened Content-
Security-Policy drops. The plugin already enqueues its frontend CSS from the
same hook.

The spinner is gated on intersection. The iframe is loading="lazy", so a
block below the fold has not begun loading yet -- starting the spinner at
parse time would leave it spinning over an idle frame until the backstop.
An IntersectionObserver with a 200px margin starts it when the browser is
about to fetch, and where that API is missing the spinner just starts
immediately.

The catalogs under languages/ carry the one new string, "Loading content…",
translated in all ten locales; CI regenerates them and fails on a stale tree.
---
 assets/css/exelearning.css            |  50 +++++++++++++++++
 assets/js/exelearning-embed-loader.js |  75 ++++++++++++++++++++++++++
 includes/class-elp-upload-block.php   |  20 ++++++-
 languages/exelearning-ca.mo           | Bin 19026 -> 19095 bytes
 languages/exelearning-ca.po           |  12 +++--
 languages/exelearning-ca_valencia.mo  | Bin 19048 -> 19117 bytes
 languages/exelearning-ca_valencia.po  |  12 +++--
 languages/exelearning-de_DE.mo        | Bin 19317 -> 19375 bytes
 languages/exelearning-de_DE.po        |  12 +++--
 languages/exelearning-eo.mo           | Bin 18705 -> 18765 bytes
 languages/exelearning-eo.po           |  12 +++--
 languages/exelearning-es_ES.mo        | Bin 19261 -> 19318 bytes
 languages/exelearning-es_ES.po        |  12 +++--
 languages/exelearning-eu.mo           | Bin 19031 -> 19086 bytes
 languages/exelearning-eu.po           |  12 +++--
 languages/exelearning-gl_ES.mo        | Bin 19039 -> 19096 bytes
 languages/exelearning-gl_ES.po        |  12 +++--
 languages/exelearning-it_IT.mo        | Bin 19070 -> 19134 bytes
 languages/exelearning-it_IT.po        |  12 +++--
 languages/exelearning-pt_PT.mo        | Bin 19247 -> 19308 bytes
 languages/exelearning-pt_PT.po        |  12 +++--
 languages/exelearning-ro_RO.mo        | Bin 19595 -> 19658 bytes
 languages/exelearning-ro_RO.po        |  12 +++--
 languages/exelearning.pot             |  12 +++--
 tests/unit/ElpUploadBlockTest.php     |  40 ++++++++++++++
 25 files changed, 272 insertions(+), 45 deletions(-)
 create mode 100644 assets/js/exelearning-embed-loader.js

diff --git a/assets/css/exelearning.css b/assets/css/exelearning.css
index 1285c74..0ab6441 100644
--- a/assets/css/exelearning.css
+++ b/assets/css/exelearning.css
@@ -291,6 +291,56 @@
     max-width: 100%;
 }
 
+/* Loading state for the embedded package.
+   The package is fetched, parsed and laid out inside the iframe before anything
+   paints, so without this the visitor stares at an empty frame. The spinner is
+   hidden unless the enqueued loader adds `is-loading`, so with JS disabled
+   nothing is shown that JS would never be able to clear. */
+.exelearning-embed-loader {
+    position: relative;
+}
+
+.exelearning-embed-loader__spinner {
+    display: none;
+    position: absolute;
+    inset: 0;
+    align-items: center;
+    justify-content: center;
+    gap: 0.6em;
+    background: #fff;
+    border: 1px solid #ddd;
+    border-radius: 4px;
+    color: #50575e;
+    font-size: 0.875rem;
+}
+
+/* Only the visibility depends on the state. */
+.exelearning-embed-loader.is-loading .exelearning-embed-loader__spinner {
+    display: flex;
+}
+
+.exelearning-embed-loader__spinner::before {
+    content: "";
+    width: 1.25em;
+    height: 1.25em;
+    border: 2px solid currentColor;
+    border-top-color: transparent;
+    border-radius: 50%;
+    animation: exelearning-embed-spin 0.8s linear infinite;
+}
+
+@keyframes exelearning-embed-spin {
+    to {
+        transform: rotate(360deg);
+    }
+}
+
+@media (prefers-reduced-motion: reduce) {
+    .exelearning-embed-loader__spinner::before {
+        animation-duration: 3s;
+    }
+}
+
 .exelearning-screenshot-img {
     display: block;
     width: 100%;
diff --git a/assets/js/exelearning-embed-loader.js b/assets/js/exelearning-embed-loader.js
new file mode 100644
index 0000000..3f5ad0a
--- /dev/null
+++ b/assets/js/exelearning-embed-loader.js
@@ -0,0 +1,75 @@
+/**
+ * Loading state for embedded eXeLearning packages.
+ *
+ * The iframe has to download, parse and lay out a whole package before anything
+ * paints, so without this the visitor stares at an empty bordered frame with no
+ * clue whether it is loading or broken.
+ *
+ * Binds every `.exelearning-embed-loader` on the page in one pass, so a page
+ * with several embeds costs one cached script instead of one inline copy per
+ * block. The spinner is revealed from here, never server-side: a visitor
+ * without JavaScript then never gets an overlay that nothing could clear.
+ */
+( function () {
+	'use strict';
+
+	/** Give up after this long so a failed embed cannot spin forever. */
+	var BACKSTOP_MS = 20000;
+
+	function bind( wrap ) {
+		var iframe = wrap.querySelector( '.exelearning-iframe' );
+		if ( ! iframe || wrap.dataset.exeLoaderBound ) {
+			return;
+		}
+		wrap.dataset.exeLoaderBound = '1';
+
+		var clear = function () {
+			wrap.classList.remove( 'is-loading' );
+		};
+		// `load` fires when the package finished downloading, but the eXeLearning
+		// theme still builds its navigation right after, so clearing immediately
+		// can uncover a frame that is still blank.
+		var clearSoon = function () {
+			setTimeout( clear, 150 );
+		};
+
+		var start = function () {
+			wrap.classList.add( 'is-loading' );
+			setTimeout( clear, BACKSTOP_MS );
+		};
+
+		iframe.addEventListener( 'load', clearSoon );
+		iframe.addEventListener( 'error', clear );
+
+		// The iframe is `loading="lazy"`: a block below the fold has not started
+		// loading yet, so showing the spinner at parse time would leave it
+		// spinning over an idle frame until the backstop. Wait until it is close
+		// enough for the browser to actually fetch it.
+		if ( ! ( 'IntersectionObserver' in window ) ) {
+			start();
+			return;
+		}
+		var observer = new IntersectionObserver(
+			function ( entries ) {
+				if ( ! entries.some( function ( entry ) { return entry.isIntersecting; } ) ) {
+					return;
+				}
+				observer.disconnect();
+				start();
+			},
+			{ rootMargin: '200px' }
+		);
+		observer.observe( iframe );
+	}
+
+	function bindAll() {
+		var wraps = document.querySelectorAll( '.exelearning-embed-loader' );
+		Array.prototype.forEach.call( wraps, bind );
+	}
+
+	if ( 'loading' === document.readyState ) {
+		document.addEventListener( 'DOMContentLoaded', bindAll );
+	} else {
+		bindAll();
+	}
+}() );
diff --git a/includes/class-elp-upload-block.php b/includes/class-elp-upload-block.php
index 3ef0813..66df0e4 100644
--- a/includes/class-elp-upload-block.php
+++ b/includes/class-elp-upload-block.php
@@ -26,7 +26,7 @@ public function __construct() {
 	}
 
 	/**
-	 * Enqueue frontend styles.
+	 * Enqueue frontend styles and the shared embed-loader behavior.
 	 */
 	public function enqueue_frontend_styles() {
 		wp_enqueue_style(
@@ -35,6 +35,15 @@ public function enqueue_frontend_styles() {
 			array(),
 			EXELEARNING_VERSION
 		);
+		// Binds every `.exelearning-embed-loader` on the page at once, so the
+		// spinner costs one cached file instead of an inline copy per block.
+		wp_enqueue_script(
+			'exelearning-embed-loader',
+			plugins_url( '../assets/js/exelearning-embed-loader.js', __FILE__ ),
+			array(),
+			EXELEARNING_VERSION,
+			true
+		);
 	}
 
 	/**
@@ -300,6 +309,10 @@ private function render_block_preview( $data, $download_html ) {
 			$html .= '<div class="exelearning-block-toolbar">' . $download_html . $fullscreen_html . '</div>';
 		}
 
+		// The package is downloaded, parsed and laid out inside the iframe before
+		// anything paints, which reads as a blank frame for a noticeable moment.
+		// Wrap it so the enqueued loader script can cover that gap with a spinner.
+		$html .= '<div class="exelearning-embed-loader">';
 		$html .= sprintf(
 			'<iframe
                 src="%s"
@@ -314,6 +327,11 @@ class="exelearning-iframe"
 			$data['height'],
 			esc_attr( get_the_title( $data['attachment_id'] ) )
 		);
+		$html .= sprintf(
+			'<div class="exelearning-embed-loader__spinner" role="status" aria-live="polite">%s</div>',
+			esc_html__( 'Loading content…', 'exelearning' )
+		);
+		$html .= '</div>';
 
 		$html .= '</div>';
 
diff --git a/languages/exelearning-ca.mo b/languages/exelearning-ca.mo
index 8ccee048a283bc7b2adf5ed6da05600e7d1bc561..b56a39f892cccd4933c929922db8d18ca28eebca 100644
GIT binary patch
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diff --git a/languages/exelearning-ca.po b/languages/exelearning-ca.po
index 4b3e3d7..3e96d9f 100644
--- a/languages/exelearning-ca.po
+++ b/languages/exelearning-ca.po
@@ -459,26 +459,30 @@ msgstr "Aquest no és un fitxer eXeLearning (.elpx)."
 msgid "Failed to create directory for extracted files."
 msgstr "Error en crear el directori per als fitxers extrets."
 
-#: includes/class-elp-upload-block.php:167
+#: includes/class-elp-upload-block.php:176
 msgid "Error: eXeLearning content not found"
 msgstr "Error: contingut d'eXeLearning no trobat"
 
-#: includes/class-elp-upload-block.php:258
+#: includes/class-elp-upload-block.php:267
 #: public/class-shortcodes.php:204
 msgid "Download file"
 msgstr "Descarrega el fitxer"
 
-#: includes/class-elp-upload-block.php:271
+#: includes/class-elp-upload-block.php:280
 msgid "This eXeLearning content is a source file and cannot be previewed directly."
 msgstr "Aquest contingut d'eXeLearning és un fitxer font i no es pot previsualitzar directament."
 
-#: includes/class-elp-upload-block.php:295
+#: includes/class-elp-upload-block.php:304
 #: public/class-shortcodes.php:336
 #: assets/js/elp-upload.js:501
 #: assets/js/elp-upload.js:502
 msgid "View fullscreen"
 msgstr "Veure a pantalla completa"
 
+#: includes/class-elp-upload-block.php:332
+msgid "Loading content…"
+msgstr "S'està carregant el contingut…"
+
 #: includes/class-exelearning-editor.php:82
 #: includes/class-exelearning-editor.php:83
 msgid "eXeLearning Editor"
diff --git a/languages/exelearning-ca_valencia.mo b/languages/exelearning-ca_valencia.mo
index 98e76b232458cf03f4291f8850f70ca1eec0cb72..eadd070c405ff4215e7379c16000c7fc99bec2f0 100644
GIT binary patch
delta 2978
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delta 2917
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diff --git a/languages/exelearning-ca_valencia.po b/languages/exelearning-ca_valencia.po
index 576000d..9d3082b 100644
--- a/languages/exelearning-ca_valencia.po
+++ b/languages/exelearning-ca_valencia.po
@@ -459,26 +459,30 @@ msgstr "Este no és un fitxer eXeLearning (.elpx)."
 msgid "Failed to create directory for extracted files."
 msgstr "Error en crear el directori per als fitxers extrets."
 
-#: includes/class-elp-upload-block.php:167
+#: includes/class-elp-upload-block.php:176
 msgid "Error: eXeLearning content not found"
 msgstr "Error: contingut d'eXeLearning no trobat"
 
-#: includes/class-elp-upload-block.php:258
+#: includes/class-elp-upload-block.php:267
 #: public/class-shortcodes.php:204
 msgid "Download file"
 msgstr "Descarregar el fitxer"
 
-#: includes/class-elp-upload-block.php:271
+#: includes/class-elp-upload-block.php:280
 msgid "This eXeLearning content is a source file and cannot be previewed directly."
 msgstr "Este contingut d'eXeLearning és un fitxer font i no es pot previsualitzar directament."
 
-#: includes/class-elp-upload-block.php:295
+#: includes/class-elp-upload-block.php:304
 #: public/class-shortcodes.php:336
 #: assets/js/elp-upload.js:501
 #: assets/js/elp-upload.js:502
 msgid "View fullscreen"
 msgstr "Veure a pantalla completa"
 
+#: includes/class-elp-upload-block.php:332
+msgid "Loading content…"
+msgstr "S'està carregant el contingut…"
+
 #: includes/class-exelearning-editor.php:82
 #: includes/class-exelearning-editor.php:83
 msgid "eXeLearning Editor"
diff --git a/languages/exelearning-de_DE.mo b/languages/exelearning-de_DE.mo
index 368ff15d796c018ff9e5cdc96e82c832a7403519..46846c200c544f1521ce1ed4c1ca95e26a18e900 100644
GIT binary patch
delta 2967
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delta 2917
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diff --git a/languages/exelearning-de_DE.po b/languages/exelearning-de_DE.po
index b7500bc..29ceff2 100644
--- a/languages/exelearning-de_DE.po
+++ b/languages/exelearning-de_DE.po
@@ -459,26 +459,30 @@ msgstr "Dies ist keine eXeLearning-Datei (.elpx)."
 msgid "Failed to create directory for extracted files."
 msgstr "Fehler beim Erstellen des Verzeichnisses für extrahierte Dateien."
 
-#: includes/class-elp-upload-block.php:167
+#: includes/class-elp-upload-block.php:176
 msgid "Error: eXeLearning content not found"
 msgstr "Fehler: eXeLearning-Inhalt nicht gefunden"
 
-#: includes/class-elp-upload-block.php:258
+#: includes/class-elp-upload-block.php:267
 #: public/class-shortcodes.php:204
 msgid "Download file"
 msgstr "Datei herunterladen"
 
-#: includes/class-elp-upload-block.php:271
+#: includes/class-elp-upload-block.php:280
 msgid "This eXeLearning content is a source file and cannot be previewed directly."
 msgstr "Dieser eXeLearning-Inhalt ist eine Quelldatei und kann nicht direkt in der Vorschau angezeigt werden."
 
-#: includes/class-elp-upload-block.php:295
+#: includes/class-elp-upload-block.php:304
 #: public/class-shortcodes.php:336
 #: assets/js/elp-upload.js:501
 #: assets/js/elp-upload.js:502
 msgid "View fullscreen"
 msgstr "Vollbild anzeigen"
 
+#: includes/class-elp-upload-block.php:332
+msgid "Loading content…"
+msgstr "Inhalt wird geladen…"
+
 #: includes/class-exelearning-editor.php:82
 #: includes/class-exelearning-editor.php:83
 msgid "eXeLearning Editor"
diff --git a/languages/exelearning-eo.mo b/languages/exelearning-eo.mo
index 74984795c0fab57c582566b7df721d64146d6193..b5d3475f5430208d4b19c3805a4ec94387d21ca2 100644
GIT binary patch
delta 2969
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delta 2917
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diff --git a/languages/exelearning-eo.po b/languages/exelearning-eo.po
index 747deb7..b478ee9 100644
--- a/languages/exelearning-eo.po
+++ b/languages/exelearning-eo.po
@@ -459,26 +459,30 @@ msgstr "Ĉi tio ne estas eXeLearning-dosiero (.elpx)."
 msgid "Failed to create directory for extracted files."
 msgstr "Malsukcesis krei dosierujon por ĉerpitaj dosieroj."
 
-#: includes/class-elp-upload-block.php:167
+#: includes/class-elp-upload-block.php:176
 msgid "Error: eXeLearning content not found"
 msgstr "Eraro: eXeLearning-enhavo ne trovita"
 
-#: includes/class-elp-upload-block.php:258
+#: includes/class-elp-upload-block.php:267
 #: public/class-shortcodes.php:204
 msgid "Download file"
 msgstr "Elŝuti dosieron"
 
-#: includes/class-elp-upload-block.php:271
+#: includes/class-elp-upload-block.php:280
 msgid "This eXeLearning content is a source file and cannot be previewed directly."
 msgstr "Ĉi tiu eXeLearning-enhavo estas fontdosiero kaj ne povas esti antaŭrigardata rekte."
 
-#: includes/class-elp-upload-block.php:295
+#: includes/class-elp-upload-block.php:304
 #: public/class-shortcodes.php:336
 #: assets/js/elp-upload.js:501
 #: assets/js/elp-upload.js:502
 msgid "View fullscreen"
 msgstr "Vidi tutekrane"
 
+#: includes/class-elp-upload-block.php:332
+msgid "Loading content…"
+msgstr "Enhavo estas ŝargata…"
+
 #: includes/class-exelearning-editor.php:82
 #: includes/class-exelearning-editor.php:83
 msgid "eXeLearning Editor"
diff --git a/languages/exelearning-es_ES.mo b/languages/exelearning-es_ES.mo
index 1b5c885e62a84318bb948214e687ee40fc5a14ad..e0cd1bb2a3e1aaf09b912433e3413ba7d765b956 100644
GIT binary patch
delta 2957
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I*?F+#e*$7dS^xk5

delta 2917
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diff --git a/languages/exelearning-es_ES.po b/languages/exelearning-es_ES.po
index 01f8b1b..6bff882 100644
--- a/languages/exelearning-es_ES.po
+++ b/languages/exelearning-es_ES.po
@@ -459,26 +459,30 @@ msgstr "Este no es un archivo eXeLearning (.elpx)."
 msgid "Failed to create directory for extracted files."
 msgstr "Error al crear el directorio para los archivos extraídos."
 
-#: includes/class-elp-upload-block.php:167
+#: includes/class-elp-upload-block.php:176
 msgid "Error: eXeLearning content not found"
 msgstr "Error: contenido de eXeLearning no encontrado"
 
-#: includes/class-elp-upload-block.php:258
+#: includes/class-elp-upload-block.php:267
 #: public/class-shortcodes.php:204
 msgid "Download file"
 msgstr "Descargar archivo"
 
-#: includes/class-elp-upload-block.php:271
+#: includes/class-elp-upload-block.php:280
 msgid "This eXeLearning content is a source file and cannot be previewed directly."
 msgstr "Este contenido de eXeLearning es un archivo fuente y no puede previsualizarse directamente."
 
-#: includes/class-elp-upload-block.php:295
+#: includes/class-elp-upload-block.php:304
 #: public/class-shortcodes.php:336
 #: assets/js/elp-upload.js:501
 #: assets/js/elp-upload.js:502
 msgid "View fullscreen"
 msgstr "Ver a pantalla completa"
 
+#: includes/class-elp-upload-block.php:332
+msgid "Loading content…"
+msgstr "Cargando contenido…"
+
 #: includes/class-exelearning-editor.php:82
 #: includes/class-exelearning-editor.php:83
 msgid "eXeLearning Editor"
diff --git a/languages/exelearning-eu.mo b/languages/exelearning-eu.mo
index 5ed6ac04eb03162298147f611a92fdc6fea1e548..b60864b61a024c415cec5dd4a28362eb0f3f28ba 100644
GIT binary patch
delta 2964
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delta 2917
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diff --git a/languages/exelearning-eu.po b/languages/exelearning-eu.po
index 93239f8..a9c5c1f 100644
--- a/languages/exelearning-eu.po
+++ b/languages/exelearning-eu.po
@@ -459,26 +459,30 @@ msgstr "Hau ez da eXeLearning fitxategia (.elpx)."
 msgid "Failed to create directory for extracted files."
 msgstr "Errorea ateratako fitxategien direktorioa sortzean."
 
-#: includes/class-elp-upload-block.php:167
+#: includes/class-elp-upload-block.php:176
 msgid "Error: eXeLearning content not found"
 msgstr "Errorea: eXeLearning edukia ez da aurkitu"
 
-#: includes/class-elp-upload-block.php:258
+#: includes/class-elp-upload-block.php:267
 #: public/class-shortcodes.php:204
 msgid "Download file"
 msgstr "Deskargatu fitxategia"
 
-#: includes/class-elp-upload-block.php:271
+#: includes/class-elp-upload-block.php:280
 msgid "This eXeLearning content is a source file and cannot be previewed directly."
 msgstr "eXeLearning eduki hau iturburu fitxategia da eta ezin da zuzenean aurreikusi."
 
-#: includes/class-elp-upload-block.php:295
+#: includes/class-elp-upload-block.php:304
 #: public/class-shortcodes.php:336
 #: assets/js/elp-upload.js:501
 #: assets/js/elp-upload.js:502
 msgid "View fullscreen"
 msgstr "Ikusi pantaila osoan"
 
+#: includes/class-elp-upload-block.php:332
+msgid "Loading content…"
+msgstr "Edukia kargatzen…"
+
 #: includes/class-exelearning-editor.php:82
 #: includes/class-exelearning-editor.php:83
 msgid "eXeLearning Editor"
diff --git a/languages/exelearning-gl_ES.mo b/languages/exelearning-gl_ES.mo
index 21aa2aa7c0c2a2cbf86950f6ac181accb6ebce86..5566502820eeae47cb7e4684ac75591bdb7ca57d 100644
GIT binary patch
delta 2957
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delta 2917
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diff --git a/languages/exelearning-gl_ES.po b/languages/exelearning-gl_ES.po
index 770becc..557029e 100644
--- a/languages/exelearning-gl_ES.po
+++ b/languages/exelearning-gl_ES.po
@@ -459,26 +459,30 @@ msgstr "Este non é un ficheiro eXeLearning (.elpx)."
 msgid "Failed to create directory for extracted files."
 msgstr "Erro ao crear o directorio para os ficheiros extraídos."
 
-#: includes/class-elp-upload-block.php:167
+#: includes/class-elp-upload-block.php:176
 msgid "Error: eXeLearning content not found"
 msgstr "Erro: contido de eXeLearning non atopado"
 
-#: includes/class-elp-upload-block.php:258
+#: includes/class-elp-upload-block.php:267
 #: public/class-shortcodes.php:204
 msgid "Download file"
 msgstr "Descargar ficheiro"
 
-#: includes/class-elp-upload-block.php:271
+#: includes/class-elp-upload-block.php:280
 msgid "This eXeLearning content is a source file and cannot be previewed directly."
 msgstr "Este contido de eXeLearning é un ficheiro fonte e non se pode previsualizar directamente."
 
-#: includes/class-elp-upload-block.php:295
+#: includes/class-elp-upload-block.php:304
 #: public/class-shortcodes.php:336
 #: assets/js/elp-upload.js:501
 #: assets/js/elp-upload.js:502
 msgid "View fullscreen"
 msgstr "Ver a pantalla completa"
 
+#: includes/class-elp-upload-block.php:332
+msgid "Loading content…"
+msgstr "Cargando o contido…"
+
 #: includes/class-exelearning-editor.php:82
 #: includes/class-exelearning-editor.php:83
 msgid "eXeLearning Editor"
diff --git a/languages/exelearning-it_IT.mo b/languages/exelearning-it_IT.mo
index 3f60cd625fc376f3f61a1f3e5e054fdad1778a96..93270227e05c925ea497d9b740334d6092935e71 100644
GIT binary patch
delta 2961
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delta 2917
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diff --git a/languages/exelearning-it_IT.po b/languages/exelearning-it_IT.po
index 16e6814..10f029a 100644
--- a/languages/exelearning-it_IT.po
+++ b/languages/exelearning-it_IT.po
@@ -459,26 +459,30 @@ msgstr "Questo non è un file eXeLearning (.elpx)."
 msgid "Failed to create directory for extracted files."
 msgstr "Errore nella creazione della directory per i file estratti."
 
-#: includes/class-elp-upload-block.php:167
+#: includes/class-elp-upload-block.php:176
 msgid "Error: eXeLearning content not found"
 msgstr "Errore: contenuto eXeLearning non trovato"
 
-#: includes/class-elp-upload-block.php:258
+#: includes/class-elp-upload-block.php:267
 #: public/class-shortcodes.php:204
 msgid "Download file"
 msgstr "Scarica file"
 
-#: includes/class-elp-upload-block.php:271
+#: includes/class-elp-upload-block.php:280
 msgid "This eXeLearning content is a source file and cannot be previewed directly."
 msgstr "Questo contenuto eXeLearning è un file sorgente e non può essere visualizzato in anteprima direttamente."
 
-#: includes/class-elp-upload-block.php:295
+#: includes/class-elp-upload-block.php:304
 #: public/class-shortcodes.php:336
 #: assets/js/elp-upload.js:501
 #: assets/js/elp-upload.js:502
 msgid "View fullscreen"
 msgstr "Visualizza a schermo intero"
 
+#: includes/class-elp-upload-block.php:332
+msgid "Loading content…"
+msgstr "Caricamento del contenuto…"
+
 #: includes/class-exelearning-editor.php:82
 #: includes/class-exelearning-editor.php:83
 msgid "eXeLearning Editor"
diff --git a/languages/exelearning-pt_PT.mo b/languages/exelearning-pt_PT.mo
index a540b91d1fae82afcb44f6e1f85d660c0e6400b8..ba5b7575b6369b93a0af13ded72172849fc76823 100644
GIT binary patch
delta 2959
zcmYM$drZ}39LMqRF%Nn;T*Que;d0RM63ImZ4G>WQZ-|(YhN(C+9W_N0+tjU-VGS!U
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HkNE!prf)*^

delta 2917
zcmYM$4~*Ak9S88|PL6+v9CsamLXbmL{&{$)9m*a4<IjN(C@rugx>?b{wgP91o9<Uq
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diff --git a/languages/exelearning-pt_PT.po b/languages/exelearning-pt_PT.po
index 2ffcf8b..61ff2e6 100644
--- a/languages/exelearning-pt_PT.po
+++ b/languages/exelearning-pt_PT.po
@@ -459,26 +459,30 @@ msgstr "Este não é um ficheiro eXeLearning (.elpx)."
 msgid "Failed to create directory for extracted files."
 msgstr "Erro ao criar o diretório para os ficheiros extraídos."
 
-#: includes/class-elp-upload-block.php:167
+#: includes/class-elp-upload-block.php:176
 msgid "Error: eXeLearning content not found"
 msgstr "Erro: conteúdo eXeLearning não encontrado"
 
-#: includes/class-elp-upload-block.php:258
+#: includes/class-elp-upload-block.php:267
 #: public/class-shortcodes.php:204
 msgid "Download file"
 msgstr "Descarregar ficheiro"
 
-#: includes/class-elp-upload-block.php:271
+#: includes/class-elp-upload-block.php:280
 msgid "This eXeLearning content is a source file and cannot be previewed directly."
 msgstr "Este conteúdo eXeLearning é um ficheiro fonte e não pode ser pré-visualizado diretamente."
 
-#: includes/class-elp-upload-block.php:295
+#: includes/class-elp-upload-block.php:304
 #: public/class-shortcodes.php:336
 #: assets/js/elp-upload.js:501
 #: assets/js/elp-upload.js:502
 msgid "View fullscreen"
 msgstr "Ver em ecrã inteiro"
 
+#: includes/class-elp-upload-block.php:332
+msgid "Loading content…"
+msgstr "A carregar o conteúdo…"
+
 #: includes/class-exelearning-editor.php:82
 #: includes/class-exelearning-editor.php:83
 msgid "eXeLearning Editor"
diff --git a/languages/exelearning-ro_RO.mo b/languages/exelearning-ro_RO.mo
index 599a3be0abe41d83e005b5eabace0aab7bf7bd55..c286c69eda486dc1103574fa923bdc8987220f25 100644
GIT binary patch
delta 2959
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delta 2917
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zm8|ETOoq17RvxkI<Fm}v?4B$Cf+#<b&qVkes>kvshx0tsQ07Jblu=aBWfpt5ij6$U
zr1UHkNS#U@!Ft+ClU@3`ftkvCDB0z}Jo#Vh;B^-gVZAky56dE|k8&r|@x#muPjM!H
z%S_Dxo7s3>6<8ZJRXVB8%2rw!WjFKwPxvvO;3&4$lw?Laho-b#$8GH3I3C~~{5g~A
zDGREOuV$uV1rz8-CeZCn2EWI#Ji=t;DAVC<ObzrgnXC;sNCQnBK8IYuY23?1{yfv*
zsiE^hW+W4=#mwz;rg(2>D{D-OA7eLPX9C-_sLIHFybvH|u2zmXFt~Dz%lQE_1xprJ
zfo<kTop-Z|$C;Y=Gbi$|%!o$lHMMXRGoTLoB$V4IhVo@56Ni~Vf5w?v|G#rE$%R2C
z_00<6JKV|CL~Ca?MJqYl`5Gp*w=(Z-W*XkX)WX*}gFVdq&ocvhk9Tv@vTDFz<4yW6
z&p9yY3&Z~e7E41f_s~i!tF0+nFZa@Hm4j42<rMRL(~9c)7UsFV+|Ls{$@{POJHm}O
zRNsl~SC;Zk=g+Zbg_YGeRwMipv#z&uJZntxJ<g>5pPb5(tEwN98O%s;qqfR}9LJ+f
zW`57XI=>N2@t*0brta^&%=v%1<o{v^lW(eiwWhMu3tPF%^@D4Cgt)*iHS!f&;^i<C
z_*=A<W(AT}^hsu&-@z2`w>Y0aW&=-gC*S3C-m`8)^=*E1T~$m!Vv6Gz%t+o~M))?<
l;8=?{BbmdDu!EW7^-N7X(7U#we`N2{*0a-kS9Wwy{2y-UJ-Yw^

diff --git a/languages/exelearning-ro_RO.po b/languages/exelearning-ro_RO.po
index 30cb7be..c40a6b8 100644
--- a/languages/exelearning-ro_RO.po
+++ b/languages/exelearning-ro_RO.po
@@ -459,26 +459,30 @@ msgstr "Acesta nu este un fișier eXeLearning (.elpx)."
 msgid "Failed to create directory for extracted files."
 msgstr "Eroare la crearea directorului pentru fișierele extrase."
 
-#: includes/class-elp-upload-block.php:167
+#: includes/class-elp-upload-block.php:176
 msgid "Error: eXeLearning content not found"
 msgstr "Eroare: conținutul eXeLearning nu a fost găsit"
 
-#: includes/class-elp-upload-block.php:258
+#: includes/class-elp-upload-block.php:267
 #: public/class-shortcodes.php:204
 msgid "Download file"
 msgstr "Descarcă fișierul"
 
-#: includes/class-elp-upload-block.php:271
+#: includes/class-elp-upload-block.php:280
 msgid "This eXeLearning content is a source file and cannot be previewed directly."
 msgstr "Acest conținut eXeLearning este un fișier sursă și nu poate fi previzualizat direct."
 
-#: includes/class-elp-upload-block.php:295
+#: includes/class-elp-upload-block.php:304
 #: public/class-shortcodes.php:336
 #: assets/js/elp-upload.js:501
 #: assets/js/elp-upload.js:502
 msgid "View fullscreen"
 msgstr "Vizualizare pe ecran complet"
 
+#: includes/class-elp-upload-block.php:332
+msgid "Loading content…"
+msgstr "Se încarcă conținutul…"
+
 #: includes/class-exelearning-editor.php:82
 #: includes/class-exelearning-editor.php:83
 msgid "eXeLearning Editor"
diff --git a/languages/exelearning.pot b/languages/exelearning.pot
index 4e342b1..336e097 100644
--- a/languages/exelearning.pot
+++ b/languages/exelearning.pot
@@ -458,26 +458,30 @@ msgstr ""
 msgid "Failed to create directory for extracted files."
 msgstr ""
 
-#: includes/class-elp-upload-block.php:167
+#: includes/class-elp-upload-block.php:176
 msgid "Error: eXeLearning content not found"
 msgstr ""
 
-#: includes/class-elp-upload-block.php:258
+#: includes/class-elp-upload-block.php:267
 #: public/class-shortcodes.php:204
 msgid "Download file"
 msgstr ""
 
-#: includes/class-elp-upload-block.php:271
+#: includes/class-elp-upload-block.php:280
 msgid "This eXeLearning content is a source file and cannot be previewed directly."
 msgstr ""
 
-#: includes/class-elp-upload-block.php:295
+#: includes/class-elp-upload-block.php:304
 #: public/class-shortcodes.php:336
 #: assets/js/elp-upload.js:501
 #: assets/js/elp-upload.js:502
 msgid "View fullscreen"
 msgstr ""
 
+#: includes/class-elp-upload-block.php:332
+msgid "Loading content…"
+msgstr ""
+
 #: includes/class-exelearning-editor.php:82
 #: includes/class-exelearning-editor.php:83
 msgid "eXeLearning Editor"
diff --git a/tests/unit/ElpUploadBlockTest.php b/tests/unit/ElpUploadBlockTest.php
index 24ca35c..a0184f7 100644
--- a/tests/unit/ElpUploadBlockTest.php
+++ b/tests/unit/ElpUploadBlockTest.php
@@ -752,6 +752,46 @@ public function test_block_iframe_has_shared_class() {
 		$this->assertStringContainsString( 'exelearning-iframe', $result );
 	}
 
+	/**
+	 * The preview iframe is wrapped in a loader that covers the blank frame
+	 * while the package downloads and lays out.
+	 */
+	public function test_block_preview_has_loading_spinner() {
+		$attachment_id = $this->create_previewable_attachment( str_repeat( 'f', 40 ) );
+
+		$result = $this->block->render_block( array( 'attachmentId' => $attachment_id ) );
+
+		$this->assertStringContainsString( 'exelearning-embed-loader', $result );
+		$this->assertStringContainsString( 'exelearning-embed-loader__spinner', $result );
+		// Announced to assistive tech rather than silently spinning.
+		$this->assertStringContainsString( 'role="status"', $result );
+		$this->assertStringContainsString( 'aria-live="polite"', $result );
+		// The behavior ships as one enqueued asset, not an inline copy per block.
+		$this->assertStringNotContainsString( '<script', $result );
+	}
+
+	/**
+	 * Without JavaScript the spinner must never appear: the `is-loading` class
+	 * that reveals it is added by the enqueued script, never rendered server-side.
+	 */
+	public function test_block_spinner_is_not_shown_without_javascript() {
+		$attachment_id = $this->create_previewable_attachment( str_repeat( 'g', 40 ) );
+
+		$result = $this->block->render_block( array( 'attachmentId' => $attachment_id ) );
+
+		$this->assertStringNotContainsString( 'is-loading', $result );
+	}
+
+	/**
+	 * The loader behavior is enqueued once for the page instead of inlined per
+	 * block instance.
+	 */
+	public function test_block_enqueues_shared_loader_script() {
+		$this->block->enqueue_frontend_styles();
+
+		$this->assertTrue( wp_script_is( 'exelearning-embed-loader', 'enqueued' ) );
+	}
+
 	/**
 	 * Rendering the block enqueues the Dashicons font used by the toolbar icons.
 	 */

From 6316efe72e31cd40a5e716e825d73f6f7b0135f8 Mon Sep 17 00:00:00 2001
From: erseco <info@ernesto.es>
Date: Tue, 28 Jul 2026 16:51:04 +0100
Subject: [PATCH 2/7] Never let the spinner cover a frame that already loaded

The intersection gate was armed at rootMargin 200px on the premise that
this is roughly when the browser starts fetching a loading="lazy" frame.
It is not: Chrome's lazy-loading distance threshold is in the low
thousands of pixels. For an embed sitting in the band between the two --
past 200px, inside the browser's fetch distance -- the frame was fetched
and its load event fired while the observer had not triggered yet. The
spinner then started on scroll, dropping a white overlay over content the
visitor was already reading, and held it for the full 20 s backstop.

Two changes, because the margin alone cannot be trusted:

- A `settled` flag. Once the frame has loaded, failed, or outlived the
  backstop, start() is a no-op. The load handler sets it synchronously
  rather than after the 150 ms grace delay, so a scroll landing in that
  window cannot start the spinner either. This is the invariant; it does
  not depend on guessing another engine's scheduling.
- The margin goes to 1500px, wide enough to cover the browser's fetch
  distance so the spinner is armed before the fetch rather than after it.

The comment explaining the gate is rewritten: it argued from a premise
that was simply wrong.

Also narrow the "not inlined" assertion. Asserting the rendered block
contains no `<script` promised more than the PR delivers -- the opt-in
fullscreen button still prints an inline script, untouched here. It now
asserts against the loader's own distinctive tokens.
---
 assets/js/exelearning-embed-loader.js | 39 ++++++++++++++++++++++-----
 tests/unit/ElpUploadBlockTest.php     |  8 ++++--
 2 files changed, 39 insertions(+), 8 deletions(-)

diff --git a/assets/js/exelearning-embed-loader.js b/assets/js/exelearning-embed-loader.js
index 3f5ad0a..bf689c6 100644
--- a/assets/js/exelearning-embed-loader.js
+++ b/assets/js/exelearning-embed-loader.js
@@ -16,6 +16,16 @@
 	/** Give up after this long so a failed embed cannot spin forever. */
 	var BACKSTOP_MS = 20000;
 
+	/**
+	 * How far ahead of the viewport to arm the spinner.
+	 *
+	 * It has to be at least the browser's own lazy-loading fetch distance, which is
+	 * far larger than "nearly visible" -- Chrome uses a viewport-distance threshold
+	 * in the low thousands of pixels. A margin smaller than that arms the spinner
+	 * only after the frame has already been fetched.
+	 */
+	var FETCH_MARGIN = '1500px';
+
 	function bind( wrap ) {
 		var iframe = wrap.querySelector( '.exelearning-iframe' );
 		if ( ! iframe || wrap.dataset.exeLoaderBound ) {
@@ -23,7 +33,14 @@
 		}
 		wrap.dataset.exeLoaderBound = '1';
 
+		// Once the frame has painted -- or failed, or outlived the backstop -- the
+		// spinner must never appear again. The margin below is a heuristic about
+		// someone else's fetch scheduling; this is the invariant that does not
+		// depend on getting that heuristic right.
+		var settled = false;
+
 		var clear = function () {
+			settled = true;
 			wrap.classList.remove( 'is-loading' );
 		};
 		// `load` fires when the package finished downloading, but the eXeLearning
@@ -34,17 +51,27 @@
 		};
 
 		var start = function () {
+			if ( settled ) {
+				return;
+			}
 			wrap.classList.add( 'is-loading' );
 			setTimeout( clear, BACKSTOP_MS );
 		};
 
-		iframe.addEventListener( 'load', clearSoon );
+		iframe.addEventListener( 'load', function () {
+			// Settled now, not in 150 ms: the frame is done, and a scroll landing in
+			// between must not be able to drop a spinner over the loaded content.
+			settled = true;
+			clearSoon();
+		} );
 		iframe.addEventListener( 'error', clear );
 
-		// The iframe is `loading="lazy"`: a block below the fold has not started
-		// loading yet, so showing the spinner at parse time would leave it
-		// spinning over an idle frame until the backstop. Wait until it is close
-		// enough for the browser to actually fetch it.
+		// The iframe is `loading="lazy"`, so the browser owns the fetch schedule and
+		// starts it long before the frame is on screen. Arming the spinner at parse
+		// time would leave it over a frame nothing is fetching yet; arming it only
+		// once the frame is nearly visible would leave it over a frame that already
+		// finished. The margin covers the browser's fetch distance, and `settled`
+		// covers whatever the margin gets wrong.
 		if ( ! ( 'IntersectionObserver' in window ) ) {
 			start();
 			return;
@@ -57,7 +84,7 @@
 				observer.disconnect();
 				start();
 			},
-			{ rootMargin: '200px' }
+			{ rootMargin: FETCH_MARGIN }
 		);
 		observer.observe( iframe );
 	}
diff --git a/tests/unit/ElpUploadBlockTest.php b/tests/unit/ElpUploadBlockTest.php
index a0184f7..3758f51 100644
--- a/tests/unit/ElpUploadBlockTest.php
+++ b/tests/unit/ElpUploadBlockTest.php
@@ -766,8 +766,12 @@ public function test_block_preview_has_loading_spinner() {
 		// Announced to assistive tech rather than silently spinning.
 		$this->assertStringContainsString( 'role="status"', $result );
 		$this->assertStringContainsString( 'aria-live="polite"', $result );
-		// The behavior ships as one enqueued asset, not an inline copy per block.
-		$this->assertStringNotContainsString( '<script', $result );
+		// The loader ships as one enqueued asset, so no copy of its behavior is
+		// inlined into the block. Asserted against its own distinctive tokens
+		// rather than "contains no <script>": the opt-in fullscreen button still
+		// prints an inline script of its own, which this PR does not touch.
+		$this->assertStringNotContainsString( 'exeLoaderBound', $result );
+		$this->assertStringNotContainsString( 'IntersectionObserver', $result );
 	}
 
 	/**

From 1f745a70cc632182291502129b1748d9c9fd7186 Mon Sep 17 00:00:00 2001
From: erseco <info@ernesto.es>
Date: Tue, 28 Jul 2026 17:59:16 +0100
Subject: [PATCH 3/7] Ask the frame whether it already loaded, instead of only
 listening

The loader is enqueued in the footer and binds no earlier than
DOMContentLoaded. An embed near the top of a long page -- a cached one
especially -- can finish before bind() ever runs, and `load` is not
re-emitted. settled therefore stayed false forever, and the moment the
observer fired, start() dropped the overlay over content the visitor was
already reading and held it for the full 20 s backstop. The previous round
closed this race from the load side; this closes it from the bind side.

Reproduced in headless Chromium against the real loader file, with the
sequence forced (wait for the embed to complete, then inject the loader):
the spinner appeared and never cleared. With the fix it never appears, over
three consecutive runs, while a slow embed bound before load still shows and
clears normally.

bind() now asks the frame directly. The embed is same-origin -- the REST
content proxy on this host -- and keeps allow-same-origin in its sandbox, so
its document is readable, with a try/catch for the cross-origin case where it
is not. The about:blank test is the part that matters: a lazy frame whose
fetch has NOT started also reports readyState 'complete', on its placeholder
document, and treating that as loaded would suppress the spinner in exactly
the case it exists for. Verified both ways in the harness.

Also drop the spinner animation under prefers-reduced-motion rather than
slowing it to 3s. A slower spin is still a spin; the visible label and
role="status" carry the message without it.
---
 assets/css/exelearning.css            |  5 +++-
 assets/js/exelearning-embed-loader.js | 38 +++++++++++++++++++++++++++
 2 files changed, 42 insertions(+), 1 deletion(-)

diff --git a/assets/css/exelearning.css b/assets/css/exelearning.css
index 0ab6441..db94fd6 100644
--- a/assets/css/exelearning.css
+++ b/assets/css/exelearning.css
@@ -335,9 +335,12 @@
     }
 }
 
+/* A slower spin is still a spin. Someone who asked for reduced motion gets none: the
+   ring stays as a static shape, and the "Loading content…" text with role="status"
+   carries the message on its own. */
 @media (prefers-reduced-motion: reduce) {
     .exelearning-embed-loader__spinner::before {
-        animation-duration: 3s;
+        animation: none;
     }
 }
 
diff --git a/assets/js/exelearning-embed-loader.js b/assets/js/exelearning-embed-loader.js
index bf689c6..c6b622f 100644
--- a/assets/js/exelearning-embed-loader.js
+++ b/assets/js/exelearning-embed-loader.js
@@ -26,6 +26,38 @@
 	 */
 	var FETCH_MARGIN = '1500px';
 
+	/**
+	 * Whether the frame finished loading before this script got a chance to listen.
+	 *
+	 * The loader is enqueued in the footer and binds no earlier than DOMContentLoaded,
+	 * so an embed near the top of a long page -- a cached one especially -- can fire
+	 * its load event before bind() ever runs. `load` is not re-emitted, so without
+	 * asking the frame directly it would look unloaded forever and the spinner would
+	 * cover finished content until the backstop expired.
+	 *
+	 * The embed is same-origin (the REST content proxy on this host) and keeps
+	 * allow-same-origin in its sandbox, so its document is readable. The about:blank
+	 * test is what makes reading it safe: a lazy frame whose fetch has NOT started
+	 * yet also reports readyState 'complete', on the placeholder document it was
+	 * created with. Treating that as loaded would suppress the spinner in exactly the
+	 * case it exists for.
+	 *
+	 * @param {HTMLIFrameElement} iframe The embed frame.
+	 * @return {boolean} True only when a real document has finished loading.
+	 */
+	function hasAlreadyLoaded( iframe ) {
+		try {
+			var doc = iframe.contentDocument;
+			return !! doc &&
+				'complete' === doc.readyState &&
+				!! doc.location &&
+				'about:blank' !== doc.location.href;
+		} catch ( e ) {
+			// Cross-origin, so unreadable. Fall through to the normal event flow.
+			return false;
+		}
+	}
+
 	function bind( wrap ) {
 		var iframe = wrap.querySelector( '.exelearning-iframe' );
 		if ( ! iframe || wrap.dataset.exeLoaderBound ) {
@@ -66,6 +98,12 @@
 		} );
 		iframe.addEventListener( 'error', clear );
 
+		// A frame that finished before we got here will never re-emit `load`, so ask
+		// it directly instead of waiting for an event that already happened.
+		if ( hasAlreadyLoaded( iframe ) ) {
+			settled = true;
+		}
+
 		// The iframe is `loading="lazy"`, so the browser owns the fetch schedule and
 		// starts it long before the frame is on screen. Arming the spinner at parse
 		// time would leave it over a frame nothing is fetching yet; arming it only

From ad00ca79d20f176d063db162ad0e61b080ce758f Mon Sep 17 00:00:00 2001
From: erseco <info@ernesto.es>
Date: Tue, 28 Jul 2026 15:56:57 +0100
Subject: [PATCH 4/7] Add a Vitest harness for the plugin's admin JavaScript

The scripts under assets/js/ had no unit tests at all: the only JS the CI
pipeline exercised was through Playwright, which needs a full WordPress
environment and cannot say why a handler misbehaved.

Vitest with happy-dom covers the gap. The admin scripts are plain jQuery
IIFEs loaded by wp_enqueue_script, so the harness gives them a window, a
document and a global jQuery, then drives them through the DOM the way
WordPress does -- no build step and no changes to the scripts themselves.

CI runs `npm run test:js` next to PHPCS, before wp-env starts: neither
needs a WordPress runtime, so both fail fast and cheap.
---
 .distignore              |    1 +
 .gitattributes           |    1 +
 .github/workflows/ci.yml |    4 +
 package-lock.json        | 1505 ++++++++++++++++++++++++++++++++++++--
 package.json             |    6 +-
 vitest.config.mts        |   13 +
 6 files changed, 1488 insertions(+), 42 deletions(-)
 create mode 100644 vitest.config.mts

diff --git a/.distignore b/.distignore
index 6d56a32..cba0493 100644
--- a/.distignore
+++ b/.distignore
@@ -74,6 +74,7 @@ sftp-config.json
 AGENTS.md
 EXELEARNING_CHANGES.md
 playwright.config.*
+vitest.config.*
 scripts
 cloudflare-worker
 mkdocs.yml
diff --git a/.gitattributes b/.gitattributes
index 1c98209..27e481e 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -48,6 +48,7 @@ sftp-config.json                                           export-ignore
 sonar-project.properties                                   export-ignore
 test.php                                                   export-ignore
 tests/                                                     export-ignore
+vitest.config.*                                            export-ignore
 
 # eXeLearning submodule (built editor is in dist/static/)
 exelearning/                                               export-ignore
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f1121c9..7ec309b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -113,6 +113,10 @@ jobs:
       - name: Run code linting (PHPCS)
         run: ./vendor/bin/phpcs --standard=.phpcs.xml.dist -q .
 
+      # === JS UNIT TESTS (no WordPress runtime needed; fail fast before wp-env) ===
+      - name: Run JavaScript unit tests
+        run: npm run test:js
+
       # === START ENVIRONMENT (with Xdebug for coverage) ===
       - name: Start wp-env with coverage
         run: npx wp-env start --xdebug=coverage
diff --git a/package-lock.json b/package-lock.json
index 44d9184..7b5e90b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11,7 +11,47 @@
       "devDependencies": {
         "@playwright/test": "^1.62.0",
         "@wordpress/env": "^11.11.0",
-        "nunjucks": "^3.2.4"
+        "happy-dom": "^20.10.2",
+        "jquery": "^3.7.1",
+        "nunjucks": "^3.2.4",
+        "vitest": "^4.1.8"
+      }
+    },
+    "node_modules/@emnapi/core": {
+      "version": "2.0.0-alpha.3",
+      "resolved": "https://registry.npmjs.org/@emnapi/core/-/core-2.0.0-alpha.3.tgz",
+      "integrity": "sha512-AZypUeJ/yByuxyS7BlSNRDOMLMlROYtjYdIAuBmJssVz1UJDSeYxLrdizhXCFYhedC5bqd/ASy8EuNXbVVXp9g==",
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "peer": true,
+      "dependencies": {
+        "@emnapi/wasi-threads": "2.0.1",
+        "tslib": "^2.4.0"
+      }
+    },
+    "node_modules/@emnapi/runtime": {
+      "version": "2.0.0-alpha.3",
+      "resolved": "https://registry.npmjs.org/@emnapi/runtime/-/runtime-2.0.0-alpha.3.tgz",
+      "integrity": "sha512-hFPAhMUjJD9BSyCANEISPOogeXC9Zo9ZQl7L6vKnaVsMkCtzznaW/naYypeyl0Gv5rYfWYsZbpixTMpjDJzQeA==",
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "peer": true,
+      "dependencies": {
+        "tslib": "^2.4.0"
+      }
+    },
+    "node_modules/@emnapi/wasi-threads": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/@emnapi/wasi-threads/-/wasi-threads-2.0.1.tgz",
+      "integrity": "sha512-9DsSk+o5NBX0CCJT8s0EROGSGxjR/tKu6aBTaVyq+SjAEQH4XcdcRxPBRzsBLizTTJ49MJjF+jgu3qnO9GLQcQ==",
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "peer": true,
+      "dependencies": {
+        "tslib": "^2.4.0"
       }
     },
     "node_modules/@inquirer/ansi": {
@@ -442,6 +482,13 @@
         "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
       }
     },
+    "node_modules/@jridgewell/sourcemap-codec": {
+      "version": "1.5.5",
+      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.5.5.tgz",
+      "integrity": "sha512-cYQ9310grqxueWbl+WuIUIaiUaDcj7WOq5fVhEljNVgRfOUhY9fy2zTvfoqWsnebh8Sl70VScFbICvJnLKB0Og==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@kwsites/file-exists": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/@kwsites/file-exists/-/file-exists-1.1.1.tgz",
@@ -484,6 +531,28 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@napi-rs/wasm-runtime": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/@napi-rs/wasm-runtime/-/wasm-runtime-1.2.0.tgz",
+      "integrity": "sha512-kDoONqMa+VnZ4vvvu/ZUurpJ4gkZU57e7g69qpNgWhYcZFPUHZM2CEMKm+cG6ufDVALbjMvfmMjFVqaK7uEMnA==",
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "@tybys/wasm-util": "^0.10.3"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.13.0 || >=23.5.0"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/Brooooooklyn"
+      },
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+      "optional": true
+    },
     "node_modules/type-is": {
       "version": "1.6.18",
       "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
@@ -4800,6 +6013,189 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/vite": {
+      "version": "8.1.5",
+      "resolved": "https://registry.npmjs.org/vite/-/vite-8.1.5.tgz",
+      "integrity": "sha512-7ULLwsCdYx/nRyrpiEwvqb5TFHrMVZyBt+rg/OAXT7rgj/z+DtTDyKFeLAdDkubDVDKD8jOsndmy7m55XcfUsw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "lightningcss": "^1.32.0",
+        "picomatch": "^4.0.5",
+        "postcss": "^8.5.17",
+        "rolldown": "~1.1.5",
+        "tinyglobby": "^0.2.17"
+      },
+      "bin": {
+        "vite": "bin/vite.js"
+      },
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      },
+      "funding": {
+        "url": "https://github.com/vitejs/vite?sponsor=1"
+      },
+      "optionalDependencies": {
+        "fsevents": "~2.3.3"
+      },
+      "peerDependencies": {
+        "@types/node": "^20.19.0 || >=22.12.0",
+        "@vitejs/devtools": "^0.3.0",
+        "esbuild": "^0.27.0 || ^0.28.0",
+        "jiti": ">=1.21.0",
+        "less": "^4.0.0",
+        "sass": "^1.70.0",
+        "sass-embedded": "^1.70.0",
+        "stylus": ">=0.54.8",
+        "sugarss": "^5.0.0",
+        "terser": "^5.16.0",
+        "tsx": "^4.8.1",
+        "yaml": "^2.4.2"
+      },
+      "peerDependenciesMeta": {
+        "@types/node": {
+          "optional": true
+        },
+        "@vitejs/devtools": {
+          "optional": true
+        },
+        "esbuild": {
+          "optional": true
+        },
+        "jiti": {
+          "optional": true
+        },
+        "less": {
+          "optional": true
+        },
+        "sass": {
+          "optional": true
+        },
+        "sass-embedded": {
+          "optional": true
+        },
+        "stylus": {
+          "optional": true
+        },
+        "sugarss": {
+          "optional": true
+        },
+        "terser": {
+          "optional": true
+        },
+        "tsx": {
+          "optional": true
+        },
+        "yaml": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/vite/node_modules/fsevents": {
+      "version": "2.3.3",
+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.3.tgz",
+      "integrity": "sha512-5xoDfX+fL7faATnagmWPpbFtwh/R77WmMMqqHGS65C3vvB0YHrgF+B1YmZ3441tMj5n63k0212XNoJwzlhffQw==",
+      "dev": true,
+      "hasInstallScript": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
+      }
+    },
+    "node_modules/vitest": {
+      "version": "4.1.10",
+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-4.1.10.tgz",
+      "integrity": "sha512-R9jUTe5S4Qb0HCd4TNqpC7oGcrMssMRGXLW80ubjWsW9VH5GF8y1Y0SFLY9AbqSk6nt0PnOx4H4WNJYZ13GUPw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@vitest/expect": "4.1.10",
+        "@vitest/mocker": "4.1.10",
+        "@vitest/pretty-format": "4.1.10",
+        "@vitest/runner": "4.1.10",
+        "@vitest/snapshot": "4.1.10",
+        "@vitest/spy": "4.1.10",
+        "@vitest/utils": "4.1.10",
+        "es-module-lexer": "^2.0.0",
+        "expect-type": "^1.3.0",
+        "magic-string": "^0.30.21",
+        "obug": "^2.1.1",
+        "pathe": "^2.0.3",
+        "picomatch": "^4.0.3",
+        "std-env": "^4.0.0-rc.1",
+        "tinybench": "^2.9.0",
+        "tinyexec": "^1.0.2",
+        "tinyglobby": "^0.2.15",
+        "tinyrainbow": "^3.1.0",
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0",
+        "why-is-node-running": "^2.3.0"
+      },
+      "bin": {
+        "vitest": "vitest.mjs"
+      },
+      "engines": {
+        "node": "^20.0.0 || ^22.0.0 || >=24.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@edge-runtime/vm": "*",
+        "@opentelemetry/api": "^1.9.0",
+        "@types/node": "^20.0.0 || ^22.0.0 || >=24.0.0",
+        "@vitest/browser-playwright": "4.1.10",
+        "@vitest/browser-preview": "4.1.10",
+        "@vitest/browser-webdriverio": "4.1.10",
+        "@vitest/coverage-istanbul": "4.1.10",
+        "@vitest/coverage-v8": "4.1.10",
+        "@vitest/ui": "4.1.10",
+        "happy-dom": "*",
+        "jsdom": "*",
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@edge-runtime/vm": {
+          "optional": true
+        },
+        "@opentelemetry/api": {
+          "optional": true
+        },
+        "@types/node": {
+          "optional": true
+        },
+        "@vitest/browser-playwright": {
+          "optional": true
+        },
+        "@vitest/browser-preview": {
+          "optional": true
+        },
+        "@vitest/browser-webdriverio": {
+          "optional": true
+        },
+        "@vitest/coverage-istanbul": {
+          "optional": true
+        },
+        "@vitest/coverage-v8": {
+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        },
+        "vite": {
+          "optional": false
+        }
+      }
+    },
     "node_modules/wasm-feature-detect": {
       "version": "1.8.0",
       "resolved": "https://registry.npmjs.org/wasm-feature-detect/-/wasm-feature-detect-1.8.0.tgz",
@@ -4817,6 +6213,16 @@
         "defaults": "^1.0.3"
       }
     },
+    "node_modules/whatwg-mimetype": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-3.0.0.tgz",
+      "integrity": "sha512-nt+N2dzIutVRxARx1nghPKGv1xHikU7HKdfafKkLNLindmPU/ch3U31NOCGGA/dmPcmb1VlofO0vnKAcsm0o/Q==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -4855,6 +6261,23 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/why-is-node-running": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
+      "integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "siginfo": "^2.0.0",
+        "stackback": "0.0.2"
+      },
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/wrap-ansi": {
       "version": "6.2.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-6.2.0.tgz",
diff --git a/package.json b/package.json
index cffa8bd..3617da2 100644
--- a/package.json
+++ b/package.json
@@ -6,13 +6,17 @@
   "devDependencies": {
     "@playwright/test": "^1.62.0",
     "@wordpress/env": "^11.11.0",
-    "nunjucks": "^3.2.4"
+    "happy-dom": "^20.10.2",
+    "jquery": "^3.7.1",
+    "nunjucks": "^3.2.4",
+    "vitest": "^4.1.8"
   },
   "scripts": {
     "wp-env": "wp-env",
     "composer": "wp-env run cli --env-cwd=wp-content/plugins/exelearning composer",
     "composer:tests-cli": "wp-env run tests-cli --env-cwd=wp-content/plugins/exelearning composer",
     "test:unit": "wp-env run tests-cli --env-cwd=wp-content/plugins/exelearning ./vendor/bin/phpunit",
+    "test:js": "vitest run",
     "test:e2e": "playwright test",
     "build": "echo 'Use make build-editor instead for static editor build'",
     "package": "npm run package:zip",
diff --git a/vitest.config.mts b/vitest.config.mts
new file mode 100644
index 0000000..50d70d9
--- /dev/null
+++ b/vitest.config.mts
@@ -0,0 +1,13 @@
+import { defineConfig } from 'vitest/config';
+
+// Vitest config for the plugin's JavaScript unit tests. The admin scripts under
+// assets/js/ are plain jQuery IIFEs loaded by wp_enqueue_script, so the suite gives
+// them a window/document and a global jQuery and then exercises them through the DOM,
+// exactly as WordPress does.
+export default defineConfig( {
+	test: {
+		globals: true,
+		environment: 'happy-dom',
+		include: [ 'tests/js/**/*.test.js' ],
+	},
+} );

From aa925033b5764c5c3da6b6d1abd365303a987bda Mon Sep 17 00:00:00 2001
From: erseco <info@ernesto.es>
Date: Tue, 28 Jul 2026 18:01:14 +0100
Subject: [PATCH 5/7] Cover the loader's ordering guarantees

Six cases, all about when the spinner may and may not appear, because the
expensive failure is not a missing spinner but one that covers content.

The first fails against the loader as published: with a frame that already
reported a completed real document, intersection still armed the overlay.
The other five are the guards that keep the fix from overcorrecting -- a lazy
frame whose fetch has not started reports readyState 'complete' on
about:blank and must still get a spinner, as must a mid-flight frame and one
whose document cannot be read at all.

IntersectionObserver is stubbed so intersection is a decision the test makes
rather than a layout accident, and contentDocument is stubbed per case
because no test environment reproduces a real lazy frame's placeholder.
---
 tests/js/exelearning_embed_loader.test.js | 162 ++++++++++++++++++++++
 1 file changed, 162 insertions(+)
 create mode 100644 tests/js/exelearning_embed_loader.test.js

diff --git a/tests/js/exelearning_embed_loader.test.js b/tests/js/exelearning_embed_loader.test.js
new file mode 100644
index 0000000..3aaa4ce
--- /dev/null
+++ b/tests/js/exelearning_embed_loader.test.js
@@ -0,0 +1,162 @@
+// Unit tests for assets/js/exelearning-embed-loader.js.
+//
+// The loader is enqueued in the footer and binds no earlier than DOMContentLoaded, so
+// it routinely arrives after an embed has already finished: `load` has fired and will
+// not fire again. Everything here is about that ordering, because getting it wrong is
+// worse than having no spinner at all -- the overlay lands on content the visitor is
+// already reading and stays for the whole backstop.
+//
+// The loader is an IIFE with no exports, so each test imports a fresh copy under a
+// cache-busting URL and drives it through the DOM.
+
+const path = require( 'path' );
+const { pathToFileURL } = require( 'url' );
+
+const LOADER = pathToFileURL(
+	path.resolve( __dirname, '../../assets/js/exelearning-embed-loader.js' )
+).href;
+
+let loadCount = 0;
+let observers = [];
+
+/**
+ * Install a controllable IntersectionObserver so intersection is a test decision
+ * rather than a layout accident.
+ */
+function installIntersectionObserver() {
+	observers = [];
+	window.IntersectionObserver = class {
+		constructor( callback, options ) {
+			this.callback = callback;
+			this.options = options;
+			this.targets = [];
+			observers.push( this );
+		}
+		observe( element ) {
+			this.targets.push( element );
+		}
+		disconnect() {
+			this.disconnected = true;
+		}
+		/** Test hook: report every observed target as intersecting. */
+		intersect() {
+			this.callback( this.targets.map( ( target ) => ( { target, isIntersecting: true } ) ) );
+		}
+	};
+}
+
+/**
+ * Build the wrapper markup the block renders, with a controllable contentDocument.
+ *
+ * @param {Object}  frame            What the embed frame should report.
+ * @param {string}  [frame.readyState] Document readyState, or null for no document.
+ * @param {string}  [frame.href]     Document location.href.
+ * @param {boolean} [frame.throws]   Whether reading contentDocument throws (cross-origin).
+ * @return {HTMLElement} The loader wrapper.
+ */
+function buildEmbed( frame ) {
+	document.body.innerHTML =
+		'<div class="exelearning-embed-loader">' +
+			'<iframe class="exelearning-iframe" loading="lazy"></iframe>' +
+			'<div class="exelearning-embed-loader__spinner" role="status" aria-live="polite">Loading…</div>' +
+		'</div>';
+
+	const iframe = document.querySelector( '.exelearning-iframe' );
+	Object.defineProperty( iframe, 'contentDocument', {
+		configurable: true,
+		get() {
+			if ( frame.throws ) {
+				throw new Error( 'cross-origin' );
+			}
+			if ( ! frame.readyState ) {
+				return null;
+			}
+			return { readyState: frame.readyState, location: { href: frame.href } };
+		},
+	} );
+
+	return document.querySelector( '.exelearning-embed-loader' );
+}
+
+/** Import a fresh copy of the loader, which binds on import. */
+async function runLoader() {
+	await import( /* @vite-ignore */ `${ LOADER }?load=${ ++loadCount }` );
+}
+
+beforeEach( () => {
+	installIntersectionObserver();
+} );
+
+afterEach( () => {
+	document.body.innerHTML = '';
+	observers = [];
+} );
+
+describe( 'exelearning-embed-loader: a frame that finished before the loader bound', () => {
+	it( 'never covers an embed whose document already loaded', async () => {
+		const wrap = buildEmbed( { readyState: 'complete', href: 'http://example.test/embed.html' } );
+
+		await runLoader();
+		observers[ 0 ].intersect();
+
+		expect( wrap.classList.contains( 'is-loading' ) ).toBe( false );
+	} );
+
+	it( 'still covers a lazy embed whose fetch has not started', async () => {
+		// A lazy frame the browser has not fetched yet reports readyState 'complete' on
+		// its about:blank placeholder. Reading that as "loaded" would suppress the
+		// spinner in the one case it exists for.
+		const wrap = buildEmbed( { readyState: 'complete', href: 'about:blank' } );
+
+		await runLoader();
+		observers[ 0 ].intersect();
+
+		expect( wrap.classList.contains( 'is-loading' ) ).toBe( true );
+	} );
+
+	it( 'still covers an embed that is mid-flight', async () => {
+		const wrap = buildEmbed( { readyState: 'loading', href: 'http://example.test/embed.html' } );
+
+		await runLoader();
+		observers[ 0 ].intersect();
+
+		expect( wrap.classList.contains( 'is-loading' ) ).toBe( true );
+	} );
+
+	it( 'falls back to the event flow when the document is unreadable', async () => {
+		// Cross-origin: we cannot know, so behave as before rather than guess.
+		const wrap = buildEmbed( { throws: true } );
+
+		await runLoader();
+		observers[ 0 ].intersect();
+
+		expect( wrap.classList.contains( 'is-loading' ) ).toBe( true );
+	} );
+} );
+
+describe( 'exelearning-embed-loader: the normal ordering still works', () => {
+	it( 'covers the frame on intersection and clears it on load', async () => {
+		const wrap = buildEmbed( { readyState: 'loading', href: 'about:blank' } );
+		const iframe = document.querySelector( '.exelearning-iframe' );
+
+		await runLoader();
+		observers[ 0 ].intersect();
+		expect( wrap.classList.contains( 'is-loading' ) ).toBe( true );
+
+		iframe.dispatchEvent( new window.Event( 'load' ) );
+		await new Promise( ( resolve ) => setTimeout( resolve, 250 ) );
+
+		expect( wrap.classList.contains( 'is-loading' ) ).toBe( false );
+	} );
+
+	it( 'does not arm the spinner after a load that arrived first', async () => {
+		const wrap = buildEmbed( { readyState: 'loading', href: 'about:blank' } );
+		const iframe = document.querySelector( '.exelearning-iframe' );
+
+		await runLoader();
+		iframe.dispatchEvent( new window.Event( 'load' ) );
+		observers[ 0 ].intersect();
+
+		expect( wrap.classList.contains( 'is-loading' ) ).toBe( false );
+	} );
+} );

From 7ffbc291e39dd881b36d23ff90fba6f758ad652a Mon Sep 17 00:00:00 2001
From: erseco <info@ernesto.es>
Date: Tue, 28 Jul 2026 18:18:14 +0100
Subject: [PATCH 6/7] Ship the loader only on pages that actually embed
 something

The loader was enqueued from wp_enqueue_scripts, so every frontend page of
the site fetched it -- including the overwhelming majority with no
eXeLearning block on them, where it binds nothing and exits.

It is now registered on that hook and enqueued by render_block_preview(),
at the point that emits the wrapper the loader looks for. A footer script
enqueued while the content renders still prints, and in a REST render the
handle was never registered, so the call is a harmless no-op.

The three tests around it assert the split: registered but not enqueued
after the hook alone, enqueued once a preview renders, and left alone by a
block that renders no preview. They dequeue the handle first because
WP_UnitTestCase shares one $wp_scripts across the file and the tests above
render previews -- without that they assert the previous test's leftovers,
which is how two of them failed in the class while passing in isolation.

Also covers the two remaining loader branches in the JS suite: a frame that
reports no document, and the path taken where IntersectionObserver does not
exist.

The catalogs under languages/ move by the line count this adds: only the
`#:` source references shift, no string changes.
---
 includes/class-elp-upload-block.php       | 16 +++++++--
 languages/exelearning-ca.po               | 10 +++---
 languages/exelearning-ca_valencia.po      | 10 +++---
 languages/exelearning-de_DE.po            | 10 +++---
 languages/exelearning-eo.po               | 10 +++---
 languages/exelearning-es_ES.po            | 10 +++---
 languages/exelearning-eu.po               | 10 +++---
 languages/exelearning-gl_ES.po            | 10 +++---
 languages/exelearning-it_IT.po            | 10 +++---
 languages/exelearning-pt_PT.po            | 10 +++---
 languages/exelearning-ro_RO.po            | 10 +++---
 languages/exelearning.pot                 | 10 +++---
 tests/js/exelearning_embed_loader.test.js | 29 ++++++++++++++++
 tests/unit/ElpUploadBlockTest.php         | 42 +++++++++++++++++++++--
 14 files changed, 136 insertions(+), 61 deletions(-)

diff --git a/includes/class-elp-upload-block.php b/includes/class-elp-upload-block.php
index 66df0e4..95f3733 100644
--- a/includes/class-elp-upload-block.php
+++ b/includes/class-elp-upload-block.php
@@ -26,7 +26,12 @@ public function __construct() {
 	}
 
 	/**
-	 * Enqueue frontend styles and the shared embed-loader behavior.
+	 * Enqueue frontend styles and register the shared embed-loader behavior.
+	 *
+	 * The loader is registered here but not enqueued: a page with no eXeLearning
+	 * block has nothing for it to bind, and enqueueing from this hook would put the
+	 * request on every frontend page of the site. render_block_preview() enqueues it
+	 * at the point it emits a wrapper for the loader to find.
 	 */
 	public function enqueue_frontend_styles() {
 		wp_enqueue_style(
@@ -37,7 +42,7 @@ public function enqueue_frontend_styles() {
 		);
 		// Binds every `.exelearning-embed-loader` on the page at once, so the
 		// spinner costs one cached file instead of an inline copy per block.
-		wp_enqueue_script(
+		wp_register_script(
 			'exelearning-embed-loader',
 			plugins_url( '../assets/js/exelearning-embed-loader.js', __FILE__ ),
 			array(),
@@ -311,7 +316,12 @@ private function render_block_preview( $data, $download_html ) {
 
 		// The package is downloaded, parsed and laid out inside the iframe before
 		// anything paints, which reads as a blank frame for a noticeable moment.
-		// Wrap it so the enqueued loader script can cover that gap with a spinner.
+		// Wrap it so the loader script can cover that gap with a spinner, and pull
+		// the script in here so it only ships on pages that actually have a wrapper.
+		// It is a footer script enqueued while the content renders, which still
+		// prints; in a REST render the handle was never registered and this is a
+		// harmless no-op.
+		wp_enqueue_script( 'exelearning-embed-loader' );
 		$html .= '<div class="exelearning-embed-loader">';
 		$html .= sprintf(
 			'<iframe
diff --git a/languages/exelearning-ca.po b/languages/exelearning-ca.po
index 3e96d9f..5e720dc 100644
--- a/languages/exelearning-ca.po
+++ b/languages/exelearning-ca.po
@@ -459,27 +459,27 @@ msgstr "Aquest no és un fitxer eXeLearning (.elpx)."
 msgid "Failed to create directory for extracted files."
 msgstr "Error en crear el directori per als fitxers extrets."
 
-#: includes/class-elp-upload-block.php:176
+#: includes/class-elp-upload-block.php:181
 msgid "Error: eXeLearning content not found"
 msgstr "Error: contingut d'eXeLearning no trobat"
 
-#: includes/class-elp-upload-block.php:267
+#: includes/class-elp-upload-block.php:272
 #: public/class-shortcodes.php:204
 msgid "Download file"
 msgstr "Descarrega el fitxer"
 
-#: includes/class-elp-upload-block.php:280
+#: includes/class-elp-upload-block.php:285
 msgid "This eXeLearning content is a source file and cannot be previewed directly."
 msgstr "Aquest contingut d'eXeLearning és un fitxer font i no es pot previsualitzar directament."
 
-#: includes/class-elp-upload-block.php:304
+#: includes/class-elp-upload-block.php:309
 #: public/class-shortcodes.php:336
 #: assets/js/elp-upload.js:501
 #: assets/js/elp-upload.js:502
 msgid "View fullscreen"
 msgstr "Veure a pantalla completa"
 
-#: includes/class-elp-upload-block.php:332
+#: includes/class-elp-upload-block.php:342
 msgid "Loading content…"
 msgstr "S'està carregant el contingut…"
 
diff --git a/languages/exelearning-ca_valencia.po b/languages/exelearning-ca_valencia.po
index 9d3082b..f3d8481 100644
--- a/languages/exelearning-ca_valencia.po
+++ b/languages/exelearning-ca_valencia.po
@@ -459,27 +459,27 @@ msgstr "Este no és un fitxer eXeLearning (.elpx)."
 msgid "Failed to create directory for extracted files."
 msgstr "Error en crear el directori per als fitxers extrets."
 
-#: includes/class-elp-upload-block.php:176
+#: includes/class-elp-upload-block.php:181
 msgid "Error: eXeLearning content not found"
 msgstr "Error: contingut d'eXeLearning no trobat"
 
-#: includes/class-elp-upload-block.php:267
+#: includes/class-elp-upload-block.php:272
 #: public/class-shortcodes.php:204
 msgid "Download file"
 msgstr "Descarregar el fitxer"
 
-#: includes/class-elp-upload-block.php:280
+#: includes/class-elp-upload-block.php:285
 msgid "This eXeLearning content is a source file and cannot be previewed directly."
 msgstr "Este contingut d'eXeLearning és un fitxer font i no es pot previsualitzar directament."
 
-#: includes/class-elp-upload-block.php:304
+#: includes/class-elp-upload-block.php:309
 #: public/class-shortcodes.php:336
 #: assets/js/elp-upload.js:501
 #: assets/js/elp-upload.js:502
 msgid "View fullscreen"
 msgstr "Veure a pantalla completa"
 
-#: includes/class-elp-upload-block.php:332
+#: includes/class-elp-upload-block.php:342
 msgid "Loading content…"
 msgstr "S'està carregant el contingut…"
 
diff --git a/languages/exelearning-de_DE.po b/languages/exelearning-de_DE.po
index 29ceff2..607224d 100644
--- a/languages/exelearning-de_DE.po
+++ b/languages/exelearning-de_DE.po
@@ -459,27 +459,27 @@ msgstr "Dies ist keine eXeLearning-Datei (.elpx)."
 msgid "Failed to create directory for extracted files."
 msgstr "Fehler beim Erstellen des Verzeichnisses für extrahierte Dateien."
 
-#: includes/class-elp-upload-block.php:176
+#: includes/class-elp-upload-block.php:181
 msgid "Error: eXeLearning content not found"
 msgstr "Fehler: eXeLearning-Inhalt nicht gefunden"
 
-#: includes/class-elp-upload-block.php:267
+#: includes/class-elp-upload-block.php:272
 #: public/class-shortcodes.php:204
 msgid "Download file"
 msgstr "Datei herunterladen"
 
-#: includes/class-elp-upload-block.php:280
+#: includes/class-elp-upload-block.php:285
 msgid "This eXeLearning content is a source file and cannot be previewed directly."
 msgstr "Dieser eXeLearning-Inhalt ist eine Quelldatei und kann nicht direkt in der Vorschau angezeigt werden."
 
-#: includes/class-elp-upload-block.php:304
+#: includes/class-elp-upload-block.php:309
 #: public/class-shortcodes.php:336
 #: assets/js/elp-upload.js:501
 #: assets/js/elp-upload.js:502
 msgid "View fullscreen"
 msgstr "Vollbild anzeigen"
 
-#: includes/class-elp-upload-block.php:332
+#: includes/class-elp-upload-block.php:342
 msgid "Loading content…"
 msgstr "Inhalt wird geladen…"
 
diff --git a/languages/exelearning-eo.po b/languages/exelearning-eo.po
index b478ee9..b0a19d2 100644
--- a/languages/exelearning-eo.po
+++ b/languages/exelearning-eo.po
@@ -459,27 +459,27 @@ msgstr "Ĉi tio ne estas eXeLearning-dosiero (.elpx)."
 msgid "Failed to create directory for extracted files."
 msgstr "Malsukcesis krei dosierujon por ĉerpitaj dosieroj."
 
-#: includes/class-elp-upload-block.php:176
+#: includes/class-elp-upload-block.php:181
 msgid "Error: eXeLearning content not found"
 msgstr "Eraro: eXeLearning-enhavo ne trovita"
 
-#: includes/class-elp-upload-block.php:267
+#: includes/class-elp-upload-block.php:272
 #: public/class-shortcodes.php:204
 msgid "Download file"
 msgstr "Elŝuti dosieron"
 
-#: includes/class-elp-upload-block.php:280
+#: includes/class-elp-upload-block.php:285
 msgid "This eXeLearning content is a source file and cannot be previewed directly."
 msgstr "Ĉi tiu eXeLearning-enhavo estas fontdosiero kaj ne povas esti antaŭrigardata rekte."
 
-#: includes/class-elp-upload-block.php:304
+#: includes/class-elp-upload-block.php:309
 #: public/class-shortcodes.php:336
 #: assets/js/elp-upload.js:501
 #: assets/js/elp-upload.js:502
 msgid "View fullscreen"
 msgstr "Vidi tutekrane"
 
-#: includes/class-elp-upload-block.php:332
+#: includes/class-elp-upload-block.php:342
 msgid "Loading content…"
 msgstr "Enhavo estas ŝargata…"
 
diff --git a/languages/exelearning-es_ES.po b/languages/exelearning-es_ES.po
index 6bff882..c1f6f37 100644
--- a/languages/exelearning-es_ES.po
+++ b/languages/exelearning-es_ES.po
@@ -459,27 +459,27 @@ msgstr "Este no es un archivo eXeLearning (.elpx)."
 msgid "Failed to create directory for extracted files."
 msgstr "Error al crear el directorio para los archivos extraídos."
 
-#: includes/class-elp-upload-block.php:176
+#: includes/class-elp-upload-block.php:181
 msgid "Error: eXeLearning content not found"
 msgstr "Error: contenido de eXeLearning no encontrado"
 
-#: includes/class-elp-upload-block.php:267
+#: includes/class-elp-upload-block.php:272
 #: public/class-shortcodes.php:204
 msgid "Download file"
 msgstr "Descargar archivo"
 
-#: includes/class-elp-upload-block.php:280
+#: includes/class-elp-upload-block.php:285
 msgid "This eXeLearning content is a source file and cannot be previewed directly."
 msgstr "Este contenido de eXeLearning es un archivo fuente y no puede previsualizarse directamente."
 
-#: includes/class-elp-upload-block.php:304
+#: includes/class-elp-upload-block.php:309
 #: public/class-shortcodes.php:336
 #: assets/js/elp-upload.js:501
 #: assets/js/elp-upload.js:502
 msgid "View fullscreen"
 msgstr "Ver a pantalla completa"
 
-#: includes/class-elp-upload-block.php:332
+#: includes/class-elp-upload-block.php:342
 msgid "Loading content…"
 msgstr "Cargando contenido…"
 
diff --git a/languages/exelearning-eu.po b/languages/exelearning-eu.po
index a9c5c1f..628558b 100644
--- a/languages/exelearning-eu.po
+++ b/languages/exelearning-eu.po
@@ -459,27 +459,27 @@ msgstr "Hau ez da eXeLearning fitxategia (.elpx)."
 msgid "Failed to create directory for extracted files."
 msgstr "Errorea ateratako fitxategien direktorioa sortzean."
 
-#: includes/class-elp-upload-block.php:176
+#: includes/class-elp-upload-block.php:181
 msgid "Error: eXeLearning content not found"
 msgstr "Errorea: eXeLearning edukia ez da aurkitu"
 
-#: includes/class-elp-upload-block.php:267
+#: includes/class-elp-upload-block.php:272
 #: public/class-shortcodes.php:204
 msgid "Download file"
 msgstr "Deskargatu fitxategia"
 
-#: includes/class-elp-upload-block.php:280
+#: includes/class-elp-upload-block.php:285
 msgid "This eXeLearning content is a source file and cannot be previewed directly."
 msgstr "eXeLearning eduki hau iturburu fitxategia da eta ezin da zuzenean aurreikusi."
 
-#: includes/class-elp-upload-block.php:304
+#: includes/class-elp-upload-block.php:309
 #: public/class-shortcodes.php:336
 #: assets/js/elp-upload.js:501
 #: assets/js/elp-upload.js:502
 msgid "View fullscreen"
 msgstr "Ikusi pantaila osoan"
 
-#: includes/class-elp-upload-block.php:332
+#: includes/class-elp-upload-block.php:342
 msgid "Loading content…"
 msgstr "Edukia kargatzen…"
 
diff --git a/languages/exelearning-gl_ES.po b/languages/exelearning-gl_ES.po
index 557029e..1a0933c 100644
--- a/languages/exelearning-gl_ES.po
+++ b/languages/exelearning-gl_ES.po
@@ -459,27 +459,27 @@ msgstr "Este non é un ficheiro eXeLearning (.elpx)."
 msgid "Failed to create directory for extracted files."
 msgstr "Erro ao crear o directorio para os ficheiros extraídos."
 
-#: includes/class-elp-upload-block.php:176
+#: includes/class-elp-upload-block.php:181
 msgid "Error: eXeLearning content not found"
 msgstr "Erro: contido de eXeLearning non atopado"
 
-#: includes/class-elp-upload-block.php:267
+#: includes/class-elp-upload-block.php:272
 #: public/class-shortcodes.php:204
 msgid "Download file"
 msgstr "Descargar ficheiro"
 
-#: includes/class-elp-upload-block.php:280
+#: includes/class-elp-upload-block.php:285
 msgid "This eXeLearning content is a source file and cannot be previewed directly."
 msgstr "Este contido de eXeLearning é un ficheiro fonte e non se pode previsualizar directamente."
 
-#: includes/class-elp-upload-block.php:304
+#: includes/class-elp-upload-block.php:309
 #: public/class-shortcodes.php:336
 #: assets/js/elp-upload.js:501
 #: assets/js/elp-upload.js:502
 msgid "View fullscreen"
 msgstr "Ver a pantalla completa"
 
-#: includes/class-elp-upload-block.php:332
+#: includes/class-elp-upload-block.php:342
 msgid "Loading content…"
 msgstr "Cargando o contido…"
 
diff --git a/languages/exelearning-it_IT.po b/languages/exelearning-it_IT.po
index 10f029a..9886f76 100644
--- a/languages/exelearning-it_IT.po
+++ b/languages/exelearning-it_IT.po
@@ -459,27 +459,27 @@ msgstr "Questo non è un file eXeLearning (.elpx)."
 msgid "Failed to create directory for extracted files."
 msgstr "Errore nella creazione della directory per i file estratti."
 
-#: includes/class-elp-upload-block.php:176
+#: includes/class-elp-upload-block.php:181
 msgid "Error: eXeLearning content not found"
 msgstr "Errore: contenuto eXeLearning non trovato"
 
-#: includes/class-elp-upload-block.php:267
+#: includes/class-elp-upload-block.php:272
 #: public/class-shortcodes.php:204
 msgid "Download file"
 msgstr "Scarica file"
 
-#: includes/class-elp-upload-block.php:280
+#: includes/class-elp-upload-block.php:285
 msgid "This eXeLearning content is a source file and cannot be previewed directly."
 msgstr "Questo contenuto eXeLearning è un file sorgente e non può essere visualizzato in anteprima direttamente."
 
-#: includes/class-elp-upload-block.php:304
+#: includes/class-elp-upload-block.php:309
 #: public/class-shortcodes.php:336
 #: assets/js/elp-upload.js:501
 #: assets/js/elp-upload.js:502
 msgid "View fullscreen"
 msgstr "Visualizza a schermo intero"
 
-#: includes/class-elp-upload-block.php:332
+#: includes/class-elp-upload-block.php:342
 msgid "Loading content…"
 msgstr "Caricamento del contenuto…"
 
diff --git a/languages/exelearning-pt_PT.po b/languages/exelearning-pt_PT.po
index 61ff2e6..21af4a4 100644
--- a/languages/exelearning-pt_PT.po
+++ b/languages/exelearning-pt_PT.po
@@ -459,27 +459,27 @@ msgstr "Este não é um ficheiro eXeLearning (.elpx)."
 msgid "Failed to create directory for extracted files."
 msgstr "Erro ao criar o diretório para os ficheiros extraídos."
 
-#: includes/class-elp-upload-block.php:176
+#: includes/class-elp-upload-block.php:181
 msgid "Error: eXeLearning content not found"
 msgstr "Erro: conteúdo eXeLearning não encontrado"
 
-#: includes/class-elp-upload-block.php:267
+#: includes/class-elp-upload-block.php:272
 #: public/class-shortcodes.php:204
 msgid "Download file"
 msgstr "Descarregar ficheiro"
 
-#: includes/class-elp-upload-block.php:280
+#: includes/class-elp-upload-block.php:285
 msgid "This eXeLearning content is a source file and cannot be previewed directly."
 msgstr "Este conteúdo eXeLearning é um ficheiro fonte e não pode ser pré-visualizado diretamente."
 
-#: includes/class-elp-upload-block.php:304
+#: includes/class-elp-upload-block.php:309
 #: public/class-shortcodes.php:336
 #: assets/js/elp-upload.js:501
 #: assets/js/elp-upload.js:502
 msgid "View fullscreen"
 msgstr "Ver em ecrã inteiro"
 
-#: includes/class-elp-upload-block.php:332
+#: includes/class-elp-upload-block.php:342
 msgid "Loading content…"
 msgstr "A carregar o conteúdo…"
 
diff --git a/languages/exelearning-ro_RO.po b/languages/exelearning-ro_RO.po
index c40a6b8..2dfd927 100644
--- a/languages/exelearning-ro_RO.po
+++ b/languages/exelearning-ro_RO.po
@@ -459,27 +459,27 @@ msgstr "Acesta nu este un fișier eXeLearning (.elpx)."
 msgid "Failed to create directory for extracted files."
 msgstr "Eroare la crearea directorului pentru fișierele extrase."
 
-#: includes/class-elp-upload-block.php:176
+#: includes/class-elp-upload-block.php:181
 msgid "Error: eXeLearning content not found"
 msgstr "Eroare: conținutul eXeLearning nu a fost găsit"
 
-#: includes/class-elp-upload-block.php:267
+#: includes/class-elp-upload-block.php:272
 #: public/class-shortcodes.php:204
 msgid "Download file"
 msgstr "Descarcă fișierul"
 
-#: includes/class-elp-upload-block.php:280
+#: includes/class-elp-upload-block.php:285
 msgid "This eXeLearning content is a source file and cannot be previewed directly."
 msgstr "Acest conținut eXeLearning este un fișier sursă și nu poate fi previzualizat direct."
 
-#: includes/class-elp-upload-block.php:304
+#: includes/class-elp-upload-block.php:309
 #: public/class-shortcodes.php:336
 #: assets/js/elp-upload.js:501
 #: assets/js/elp-upload.js:502
 msgid "View fullscreen"
 msgstr "Vizualizare pe ecran complet"
 
-#: includes/class-elp-upload-block.php:332
+#: includes/class-elp-upload-block.php:342
 msgid "Loading content…"
 msgstr "Se încarcă conținutul…"
 
diff --git a/languages/exelearning.pot b/languages/exelearning.pot
index 336e097..4bafdd6 100644
--- a/languages/exelearning.pot
+++ b/languages/exelearning.pot
@@ -458,27 +458,27 @@ msgstr ""
 msgid "Failed to create directory for extracted files."
 msgstr ""
 
-#: includes/class-elp-upload-block.php:176
+#: includes/class-elp-upload-block.php:181
 msgid "Error: eXeLearning content not found"
 msgstr ""
 
-#: includes/class-elp-upload-block.php:267
+#: includes/class-elp-upload-block.php:272
 #: public/class-shortcodes.php:204
 msgid "Download file"
 msgstr ""
 
-#: includes/class-elp-upload-block.php:280
+#: includes/class-elp-upload-block.php:285
 msgid "This eXeLearning content is a source file and cannot be previewed directly."
 msgstr ""
 
-#: includes/class-elp-upload-block.php:304
+#: includes/class-elp-upload-block.php:309
 #: public/class-shortcodes.php:336
 #: assets/js/elp-upload.js:501
 #: assets/js/elp-upload.js:502
 msgid "View fullscreen"
 msgstr ""
 
-#: includes/class-elp-upload-block.php:332
+#: includes/class-elp-upload-block.php:342
 msgid "Loading content…"
 msgstr ""
 
diff --git a/tests/js/exelearning_embed_loader.test.js b/tests/js/exelearning_embed_loader.test.js
index 3aaa4ce..490994d 100644
--- a/tests/js/exelearning_embed_loader.test.js
+++ b/tests/js/exelearning_embed_loader.test.js
@@ -132,6 +132,35 @@ describe( 'exelearning-embed-loader: a frame that finished before the loader bou
 
 		expect( wrap.classList.contains( 'is-loading' ) ).toBe( true );
 	} );
+
+	it( 'still covers a frame that reports no document at all', async () => {
+		const wrap = buildEmbed( { readyState: null } );
+
+		await runLoader();
+		observers[ 0 ].intersect();
+
+		expect( wrap.classList.contains( 'is-loading' ) ).toBe( true );
+	} );
+} );
+
+describe( 'exelearning-embed-loader: without IntersectionObserver', () => {
+	it( 'arms the spinner immediately rather than never', async () => {
+		delete window.IntersectionObserver;
+		const wrap = buildEmbed( { readyState: 'loading', href: 'about:blank' } );
+
+		await runLoader();
+
+		expect( wrap.classList.contains( 'is-loading' ) ).toBe( true );
+	} );
+
+	it( 'still leaves a frame that already loaded uncovered', async () => {
+		delete window.IntersectionObserver;
+		const wrap = buildEmbed( { readyState: 'complete', href: 'http://example.test/embed.html' } );
+
+		await runLoader();
+
+		expect( wrap.classList.contains( 'is-loading' ) ).toBe( false );
+	} );
 } );
 
 describe( 'exelearning-embed-loader: the normal ordering still works', () => {
diff --git a/tests/unit/ElpUploadBlockTest.php b/tests/unit/ElpUploadBlockTest.php
index 3758f51..3597023 100644
--- a/tests/unit/ElpUploadBlockTest.php
+++ b/tests/unit/ElpUploadBlockTest.php
@@ -787,15 +787,51 @@ public function test_block_spinner_is_not_shown_without_javascript() {
 	}
 
 	/**
-	 * The loader behavior is enqueued once for the page instead of inlined per
-	 * block instance.
+	 * The loader is registered on the frontend hook but not shipped from it: a page
+	 * with no eXeLearning block has nothing for it to bind.
 	 */
-	public function test_block_enqueues_shared_loader_script() {
+	public function test_block_registers_loader_without_enqueueing_it() {
+		// WP_UnitTestCase keeps one $wp_scripts for the whole process, and the tests
+		// above render previews, which now enqueue the loader. Start from a known
+		// state or this asserts the leftovers of whatever ran first.
+		wp_dequeue_script( 'exelearning-embed-loader' );
+
+		$this->block->enqueue_frontend_styles();
+
+		$this->assertTrue( wp_script_is( 'exelearning-embed-loader', 'registered' ) );
+		$this->assertFalse( wp_script_is( 'exelearning-embed-loader', 'enqueued' ) );
+	}
+
+	/**
+	 * Rendering a preview is what pulls the loader in, so it ships exactly on the
+	 * pages that carry a wrapper for it to find.
+	 */
+	public function test_block_enqueues_loader_when_a_preview_renders() {
+		wp_dequeue_script( 'exelearning-embed-loader' );
 		$this->block->enqueue_frontend_styles();
+		$attachment_id = $this->create_previewable_attachment( str_repeat( 'h', 40 ) );
+
+		$this->block->render_block( array( 'attachmentId' => $attachment_id ) );
 
 		$this->assertTrue( wp_script_is( 'exelearning-embed-loader', 'enqueued' ) );
 	}
 
+	/**
+	 * A block with no preview renders no wrapper, so it must not drag the loader
+	 * onto the page either.
+	 */
+	public function test_block_without_preview_does_not_enqueue_loader() {
+		wp_dequeue_script( 'exelearning-embed-loader' );
+		$this->block->enqueue_frontend_styles();
+		$attachment_id = $this->factory->attachment->create();
+		update_post_meta( $attachment_id, '_exelearning_extracted', str_repeat( 'i', 40 ) );
+		update_post_meta( $attachment_id, '_exelearning_has_preview', '0' );
+
+		$this->block->render_block( array( 'attachmentId' => $attachment_id ) );
+
+		$this->assertFalse( wp_script_is( 'exelearning-embed-loader', 'enqueued' ) );
+	}
+
 	/**
 	 * Rendering the block enqueues the Dashicons font used by the toolbar icons.
 	 */

From 9d80a474401912cf39d0d9a0bf40ce9f7e48d4ef Mon Sep 17 00:00:00 2001
From: erseco <info@ernesto.es>
Date: Tue, 28 Jul 2026 20:07:44 +0100
Subject: [PATCH 7/7] Drop the jQuery dev dependency nothing imports

The Vitest suite tests the embed loader, which is plain DOM; no setup file
ever provided the global jQuery the config comment promised. Remove the
dependency and make the comment describe the harness that actually exists.
---
 package-lock.json | 8 --------
 package.json      | 1 -
 vitest.config.mts | 8 ++++----
 3 files changed, 4 insertions(+), 13 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index 7b5e90b..a1677fe 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,7 +12,6 @@
         "@playwright/test": "^1.62.0",
         "@wordpress/env": "^11.11.0",
         "happy-dom": "^20.10.2",
-        "jquery": "^3.7.1",
         "nunjucks": "^3.2.4",
         "vitest": "^4.1.8"
       }
@@ -3931,13 +3930,6 @@
         "@pkgjs/parseargs": "^0.11.0"
       }
     },
-    "node_modules/jquery": {
-      "version": "3.7.1",
-      "resolved": "https://registry.npmjs.org/jquery/-/jquery-3.7.1.tgz",
-      "integrity": "sha512-m4avr8yL8kmFN8psrbFFFmB/If14iN5o9nw/NgnnM+kybDJpRsAynV2BsfpTYrTRysYUdADVD7CkUUizgkpLfg==",
-      "dev": true,
-      "license": "MIT"
-    },
     "node_modules/js-yaml": {
       "version": "3.15.0",
       "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-3.15.0.tgz",
diff --git a/package.json b/package.json
index 3617da2..6d058dc 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,6 @@
     "@playwright/test": "^1.62.0",
     "@wordpress/env": "^11.11.0",
     "happy-dom": "^20.10.2",
-    "jquery": "^3.7.1",
     "nunjucks": "^3.2.4",
     "vitest": "^4.1.8"
   },
diff --git a/vitest.config.mts b/vitest.config.mts
index 50d70d9..1ebd9c4 100644
--- a/vitest.config.mts
+++ b/vitest.config.mts
@@ -1,9 +1,9 @@
 import { defineConfig } from 'vitest/config';
 
-// Vitest config for the plugin's JavaScript unit tests. The admin scripts under
-// assets/js/ are plain jQuery IIFEs loaded by wp_enqueue_script, so the suite gives
-// them a window/document and a global jQuery and then exercises them through the DOM,
-// exactly as WordPress does.
+// Vitest config for the plugin's JavaScript unit tests. The scripts under
+// assets/js/ are plain IIFEs loaded by wp_enqueue_script, so the suite gives them a
+// window/document (happy-dom) and exercises them through the DOM, exactly as
+// WordPress does. Scripts that also need jQuery will need it stubbed per-test.
 export default defineConfig( {
 	test: {
 		globals: true,