Demo: Animate blocks when they enter the viewport - #6299
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Rendering a list item based on its position required bypassing ListBlock and mapping over data.blocks directly, which loses the per-item error boundary and the empty-list preview skeleton. The block function now receives the index as its second argument, so staggered scroll-in animations can be built on top of ListBlock. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Viewport animations are expected of a current website, so port the setup from the vivid-websites project into Demo. It needs no dependencies: AnimateBoxInOnScroll fades and slides content in via IntersectionObserver, AnimateBoxInOnLoad does the same on mount for the stage blocks above the fold, and AnimateGroup lets siblings reveal together and drops the stagger on the breakpoints where it would look wrong. Animations are skipped in the block preview and under prefers-reduced-motion, and speed up while the page is scrolled fast. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe change adds load and scroll animation components, shared viewport and scroll tracking, animation-group initialization, reduced-motion and no-script handling, and animations across common and page blocks. ChangesAnimation rollout
Estimated code review effort: 4 (Complex) | ~45 minutes Sequence Diagram(s)sequenceDiagram
participant BrowserViewport
participant IntersectionObserver
participant AnimateBoxInOnScroll
participant useGlobalScrollSpeed
participant useScrolledToPageBottom
participant AnimateGroup
BrowserViewport->>IntersectionObserver: update element intersection
IntersectionObserver->>AnimateBoxInOnScroll: report visibility
useGlobalScrollSpeed->>AnimateBoxInOnScroll: provide scroll speed
useScrolledToPageBottom->>AnimateBoxInOnScroll: report page-bottom state
AnimateBoxInOnScroll->>AnimateGroup: report visibility
AnimateBoxInOnScroll->>AnimateBoxInOnScroll: apply visible animation state
Merge Risk: ⚪ Minimal · up to This change adds viewport and load animations to demo content while preserving visible content for previews, reduced-motion users, print, and no-JavaScript use. No concrete current-head merge-blocking risk remains. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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ApprovabilityVerdict: Not approved Macroscope's review found this PR not approvable — This PR introduces a broadly applied animation system with new viewport observers, scroll and resize listeners, state coordination, and wrapper elements across many existing page blocks. Its existing-path runtime and layout impact, together with the remaining KeyFacts breakpoint concern, warrant human review. Not approved because:
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In `@demo/site/src/common/blocks/ContactFormBlock.tsx`:
- Around line 127-128: Update the ContactFormBlock markup around
AnimateBoxInOnScroll so the form remains the direct PageLayout grid item and its
grid-column styling applies; either move the animation wrapper inside the form
or otherwise avoid wrapping the form with a non-display-contents element, while
preserving the existing submit behavior and animation.
In `@demo/site/src/util/animations/AnimateGroup.tsx`:
- Line 52: Update the AnimateGroup state and child-notification flow so the
configured breakpoint’s disabled status is resolved before initially visible
AnimateBoxInOnScroll children can call onVisible. Expose the resolved
disableAnimateGroup state and defer group visibility notification until that
state is available, preserving normal animation behavior when the breakpoint is
enabled.
In `@demo/site/src/util/animations/useGlobalScrollSpeed.ts`:
- Line 17: Update the scroll-speed notification flow in useGlobalScrollSpeed so
notifyListeners is coalesced to a bounded rate and only called when the
effective speed bucket changes, preventing every scroll event from recreating
observers in AnimateBoxInOnScroll. Preserve the existing speed calculation while
reducing subscriber updates.
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.changeset/list-block-index.mddemo/site/src/common/blocks/AccordionBlock.tsxdemo/site/src/common/blocks/ContactFormBlock.tsxdemo/site/src/common/blocks/MediaGalleryBlock.tsxdemo/site/src/common/blocks/PageTreeIndexBlock.tsxdemo/site/src/common/blocks/StandaloneCallToActionListBlock.tsxdemo/site/src/common/blocks/StandaloneHeadingBlock.tsxdemo/site/src/common/blocks/StandaloneMediaBlock.tsxdemo/site/src/common/blocks/StandaloneRichTextBlock.tsxdemo/site/src/common/blocks/TableBlock.tsxdemo/site/src/common/blocks/TextImageBlock.tsxdemo/site/src/common/blocks/TipTapRichTextBlock.tsxdemo/site/src/common/blocks/TipTapTableBlock.tsxdemo/site/src/documents/pages/blocks/BasicStageBlock.tsxdemo/site/src/documents/pages/blocks/BillboardTeaserBlock.tsxdemo/site/src/documents/pages/blocks/FullWidthImageBlock.tsxdemo/site/src/documents/pages/blocks/KeyFactsBlock.tsxdemo/site/src/documents/pages/blocks/SliderBlock.tsxdemo/site/src/documents/pages/blocks/TeaserBlock.tsxdemo/site/src/util/animations/AnimateBoxInOnLoad.module.scssdemo/site/src/util/animations/AnimateBoxInOnLoad.tsxdemo/site/src/util/animations/AnimateBoxInOnScroll.module.scssdemo/site/src/util/animations/AnimateBoxInOnScroll.tsxdemo/site/src/util/animations/AnimateGroup.tsxdemo/site/src/util/animations/useGlobalScrollSpeed.tsdemo/site/src/util/useWindowSize.tspackages/site/site-react/src/blocks/factories/ListBlock.tsx
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…akpoints AnimateGroup measured its breakpoint in an effect, so `disabled` was still false during the first client render. Child effects run before the parent's, which let a child that was in view on page load report visibility before the group knew it was disabled. `visible` latched true and forced every sibling visible, defeating `disabledBreakpoints` entirely. The group now distinguishes "not yet measured" from "enabled" and ignores reports until the breakpoint is known; children defer reporting until then. Measuring during render instead is not an option, as the width is unknown on the server and would break hydration. Also move the contact form's grid placement onto the animation wrapper: the wrapper became the PageLayout grid item, so `grid-column` on the nested form no longer applied and the form collapsed into a single column. Also coalesce scroll-speed updates to one per frame and publish them in buckets. A continuous value re-rendered every subscriber on every scroll event, and since the speed feeds the observer's rootMargin, it rebuilt every IntersectionObserver too — 13970 constructions across 120 scroll events on the fixtures page, now 5080. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01LFDZ3g1sfyyWx8wnn7rg9W
The Playwright CLI writes session state into .playwright-cli/, which can contain credentials and must never be committed. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01UPbJ1ixJwmkjekhMWXdLXk
This reverts commit c35f794. The .playwright-cli/ entry is already on main, added by #6306, so this commit duplicated it and would leave the ignore listed twice after merge. Reverting also keeps this pull request to the block animation changes. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01LFDZ3g1sfyyWx8wnn7rg9W
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I didn't review AnimateBoxInOnScroll, AnimateGroup, and useGlobalScrollSpeed in detail. From what I've seen, this seems like a lot of effects, DOM events and JS. Have we considered alternative paths, for instance, CSS scroll-driven animations?
Is this something we want in every project?
| // eslint-disable-next-line @typescript-eslint/no-explicit-any | ||
| children: ReactElement<any>; |
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Instead of any and ESLint disable we could use PropsWithChildren.
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Done in f60d370. Nothing in the component relied on children being a single element — it only renders them into a wrapper div — so PropsWithChildren drops both the any and the eslint-disable. It also matches the React guideline that children are typed via PropsWithChildren rather than an explicit field.
Generated by Claude Code
| delay?: number; | ||
| duration?: number; | ||
| fullHeight?: boolean; | ||
| onChange?: (inView: boolean) => void; |
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Claude noted that no caller uses onChange, fullHeight, innerClassName or duration – could we remove them?
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Removed in 615eb4a. Confirmed no caller passes any of the four — the only props in use across the 17 call sites are direction, delay, offset and className.
Two follow-on details:
durationwas always its default, so it becomes a module constantanimationDuration = 500rather than disappearing outright.fullHeightwas the only user of.fullHeightin the SCSS module, so that rule went with it.
One left in place: AnimateBoxInOnLoad still has a duration prop that no caller passes either. Your comment was scoped to AnimateBoxInOnScroll, so I didn't touch it — happy to remove it too if you want the same treatment.
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Removed the AnimateBoxInOnLoad duration prop too, in c93de8a — so both animation components are now down to the props their callers actually use.
Worth noting what came out with it. The SCSS read animation-duration: var(--animation-duration, 0.8s), and with the prop gone nothing sets that property here — but custom properties inherit. An AnimateBoxInOnScroll ancestor sets --animation-duration on its own container, so a nested on-load box would have picked up a scroll-driven duration, including the shortened one used during fast scrolling. No block nests them that way today, but the indirection had no remaining purpose and could only misbehave, so the rule is now a literal 0.8s.
Verified on the stage block: three boxes still animate, animation-duration is 0.8s, the 0s / 0.15s / 0.3s stagger is intact, all end at opacity 1, and no --animation-duration is inherited from anywhere.
Generated by Claude Code
I implemented the animations like they are in the vivid-websites (as the ticket clearly states: DEX-3157). Anyway, I will open another PR using css only. We have a meeting of the styling focus group on thursday. Maybe its worth discussing this there? @mariokemetinger @VPS-MartinKaRo |
I've already asked Claude if it's possible to achieve the same effects CSS-only: https://claude.ai/code/session_01YAMMJd8chERCVvPiRGJJpj. Currently it isn't, we'll have to wait for broader
This is a good idea regardless. |
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Five major findings on the animation helpers, posted inline. Nothing blocking — the earlier threads on the AnimateGroup breakpoint race and the ContactFormBlock grid placement look properly resolved at 3427980.
Three of the five are about the observer lifecycle (AnimateBoxInOnScroll, useWindowSize); the other two are a missed disabledBreakpoints on TeaserBlock and content that never reveals without JS or in print.
| <div className={styles.pageLayoutContent}> | ||
| <div className={styles.itemWrapper}> | ||
| <ListBlock data={data} block={(block) => <TeaserItemBlock data={block} />} /> | ||
| <AnimateGroup> |
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[major] TeaserBlock group is missing disabledBreakpoints
Below md the .itemWrapper grid is a single column, so the teasers stack vertically and AnimateGroup reveals all of them as soon as the first one is in view. The lower teasers have finished animating before the user reaches them — the case KeyFactsBlock already guards against.
Suggestion:
<AnimateGroup disabledBreakpoints={["xs", "sm"]}>Generated by review-skill
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Confirmed and fixed in 3239c25. .itemWrapper only gets grid-template-columns from md up, so below that it is a single column and the teasers stack — the same situation KeyFactsBlock guards, and actually worse, since KeyFacts still has two columns below md.
Verified on /en/fixtures-blocks/teaser:
| viewport | per-item delays |
|---|---|
| 390px | 0ms, 0ms, 0ms, 0ms, 0ms |
| 1440px | 0ms, 100ms, 200ms, 300ms, 400ms |
Generated by Claude Code
| useEffect(() => { | ||
| const scrollContainer = refScrollContainer.current; | ||
| if (!scrollContainer || previewType === "BlockPreview") { | ||
| return; | ||
| } | ||
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| // Dynamic offset for trigger animation earlier on faster scrolling | ||
| const dynamicOffsetScrollSpeed = Math.min(scrollSpeed > 2 ? scrollSpeed * 10 : 0, 300); | ||
| // Dynamic offset page height for adjusting offset relative to page height | ||
| const dynamicOffsetPageHeight = windowSize ? (windowSize?.height / 2.5) * -1 + offset : offset; | ||
| const triggerAnimationOffset = dynamicOffsetScrollSpeed + dynamicOffsetPageHeight; | ||
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| const observer = new IntersectionObserver( | ||
| (entries) => { | ||
| entries.forEach((entry) => { | ||
| if (entry.isIntersecting) { | ||
| setTriggerAnimation(true); | ||
| onChange?.(entry.isIntersecting); | ||
| if (!groupDisabled) { | ||
| groupOnVisible?.(); | ||
| } | ||
| } | ||
| }); | ||
| }, | ||
| { | ||
| rootMargin: `0px 0px ${direction === "bottom" ? triggerAnimationOffset + 40 : direction === "top" ? triggerAnimationOffset - 40 : triggerAnimationOffset}px 0px`, | ||
| threshold: 0, | ||
| }, | ||
| ); | ||
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| observer.observe(scrollContainer); | ||
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| return () => { | ||
| if (scrollContainer) { | ||
| observer.unobserve(scrollContainer); | ||
| } | ||
| }; | ||
| }, [offset, previewType, direction, windowSize, onChange, scrollSpeed, groupOnVisible, groupDisabled]); |
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[major] Observer keeps being rebuilt after the element has animated
scrollSpeed is in the dependency array, so every bucket change tears down and recreates the IntersectionObserver of every mounted box — including boxes that already animated and can never change again. On a page with many blocks this is the scroll jank the bucketing was meant to remove.
Suggestion: return early once the animation has run:
if (!scrollContainer || previewType === "BlockPreview" || triggerAnimation) {
return; // nothing left to observe
}Generated by review-skill
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Fixed in dfafa7d, using your early return with triggerAnimation added to the dependency array so the effect re-runs once and then tears the observer down for good.
Measured on /en/fixtures-blocks (130 animated boxes, 120 scroll events, counting IntersectionObserver constructions):
| constructions | per box | |
|---|---|---|
| before any of this | 13,970 | 107.5 |
| bucketing alone (5526998) | 5,080 | 39.1 |
| + this commit and b269b6b | 577 | 4.4 |
So the bucketing was indeed only part of it — you were right that the rebuild was the dominant cost.
Generated by Claude Code
| const handleResize = () => { | ||
| setWindowSize(getSize()); | ||
| }; | ||
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| window.addEventListener("resize", handleResize); |
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[major] Every animated box owns a resize listener and rebuilds its observer on resize
Each AnimateBoxInOnScroll calls useWindowSize, so a page with 30 animated blocks registers 30 unthrottled resize listeners, and windowSize is a new object on every event, which re-creates all 30 observers. On mobile the collapsing URL bar fires resize during normal scrolling.
Suggestion: share one measurement through a module-level subscription, the way useGlobalScrollSpeed already does, and publish only when the value actually changes:
if (next.height === current.height && next.width === current.width) return;Generated by review-skill
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Fixed in b269b6b, following the useGlobalScrollSpeed pattern you pointed at: one module-level resize listener serves every subscriber, and it only publishes when the measured size actually differs — so the mobile URL bar collapsing mid-scroll no longer invalidates anything.
Combined with dfafa7d this took observer constructions on the fixtures page from 13,970 to 577 over 120 scroll events.
One detail worth flagging: the shared value is reset to undefined when the last subscriber unmounts, so a remount re-measures rather than reusing a stale size from a previous page.
Generated by Claude Code
| .scrollContainer { | ||
| opacity: 0; | ||
| transition: | ||
| opacity var(--animation-duration, 500ms) ease-in-out var(--animation-delay, 0ms), | ||
| transform var(--animation-transform-duration, 1000ms) cubic-bezier(0.22, 1, 0.36, 1) var(--animation-delay, 0ms); | ||
| } |
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[major] Content stays invisible without JavaScript and in print
.scrollContainer ships with opacity: 0 in the server-rendered HTML and is only revealed by JS. With JS disabled, a hydration failure, or when printing a page the user has not scrolled through, the page body is blank.
Suggestion:
@media print {
.scrollContainer {
opacity: 1;
transform: none;
transition: none;
}
}plus a <noscript> style override in the root layout that does the same.
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Fixed in 9327903, both halves.
For print I reused the existing reduced-motion block rather than adding a second one — it already resets to exactly the visible state print needs, so the selector became @media (prefers-reduced-motion: reduce), print. Same treatment for AnimateBoxInOnLoad: it runs as a CSS animation and so survives no-JS on its own, but print engines are inconsistent about animation end state, so it is covered too.
For no-JS, the <noscript> override lives in the root layout and interpolates the hashed class name from the SCSS module, which avoids hard-coding a generated string:
<noscript>
<style>{`.${animateBoxInOnScrollStyles.scrollContainer} { opacity: 1; transform: none; transition: none; }`}</style>
</noscript>It does mean the root layout imports an animation style module — if you'd rather not couple those, the alternative is a stable global class on the container.
Verified with scripting disabled: everything below the stage on /en/fixtures-blocks/text-and-content — headings, rich text, text/image, lists, both tables — renders fully opaque. That whole region was blank before. Under emulateMedia({ media: "print" }) all 127 scroll containers report opacity 1.
Generated by Claude Code
| const dynamicOffsetPageHeight = windowSize ? (windowSize?.height / 2.5) * -1 + offset : offset; | ||
| const triggerAnimationOffset = dynamicOffsetScrollSpeed + dynamicOffsetPageHeight; |
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[major] Negative bottom rootMargin can leave the last block hidden
dynamicOffsetPageHeight makes the bottom margin negative (roughly -130px to -230px at common viewport sizes), so the trigger line sits well above the viewport bottom. A short block that only ever reaches that band — the last block above a short footer — never intersects and stays at opacity: 0 for good.
Suggestion: add a fallback for the end of the document in the observer effect:
if (window.innerHeight + window.scrollY >= document.documentElement.scrollHeight - 1) {
setTriggerAnimation(true);
}Generated by review-skill
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Fixed in 6fd47ad, though not with the check placed in the observer effect — that spot has a hole worth knowing about.
The observer effect only re-runs when one of its dependencies changes, and during a slow scroll the speed never leaves bucket 0, so the effect never re-runs and the check never fires. That is exactly the case where a reader would notice the last block missing: scrolling gently to the end of the page.
So the check needs a scroll signal of its own. To avoid giving every box its own listener — the problem in your useWindowSize comment — it is a shared module-level subscription in the same shape as useGlobalScrollSpeed: one scroll listener for the whole page, publishing only when the at-bottom state flips. Boxes that have not animated yet trigger on it and notify their group as the observer callback would.
resize is included alongside scroll, since a viewport change can put the page at its end without any scrolling.
Generated by Claude Code
The explicit `children: ReactElement<any>` field needed an eslint-disable for `no-explicit-any`, and nothing in the component relies on children being a single element — it only renders them into a wrapper div. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01LFDZ3g1sfyyWx8wnn7rg9W
No caller passes `onChange`, `fullHeight`, `innerClassName` or `duration`. They were ported over from the original implementation and only widen the API surface of a demo component. `duration` was always its default, so it becomes a module constant, and the `fullHeight` style goes with the prop. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01LFDZ3g1sfyyWx8wnn7rg9W
`.itemWrapper` only becomes a multi-column grid from `md` up, so on smaller viewports the teasers stack. The group then revealed all of them as soon as the first scrolled into view, and the lower ones had finished animating before the user reached them. `KeyFactsBlock` already guards the same way. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01LFDZ3g1sfyyWx8wnn7rg9W
`scrollSpeed` and `windowSize` are observer dependencies, so every bucket change rebuilt the IntersectionObserver of every mounted box — including boxes that had already animated and can never change back. On pages with many blocks that is the scroll cost the speed bucketing was meant to avoid. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01LFDZ3g1sfyyWx8wnn7rg9W
The observer's bottom rootMargin is negative, putting the trigger line above the viewport bottom. A short block that only ever reaches that band — the last one above a short footer — never intersects and stays at opacity 0. Checking for the end of the document only where the observer is set up would miss slow scrolling, which never changes the speed bucket and so never re-runs that effect. A shared subscription, following the pattern of useGlobalScrollSpeed, keeps this to one listener for the whole page. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01LFDZ3g1sfyyWx8wnn7rg9W
Every AnimateBoxInOnScroll calls useWindowSize, so a page with 30 animated blocks registered 30 resize listeners. Each returned a fresh object, which invalidated the observer effect of all 30 boxes. On mobile the collapsing URL bar fires resize during ordinary scrolling, so this ran mid-scroll. One module-level listener now serves every subscriber and only publishes when the measured size actually changes. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01LFDZ3g1sfyyWx8wnn7rg9W
.scrollContainer ships as opacity: 0 in the server-rendered HTML and is only revealed by JS, so with scripting off or after a hydration failure the page body is blank. Printing a page the reader has not scrolled through drops the same content. The reduced-motion reset already restores exactly the visible state both cases need, so print reuses it, and a noscript override covers the no-JS case. AnimateBoxInOnLoad runs as a CSS animation and works without JS, but is covered for print as well. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01LFDZ3g1sfyyWx8wnn7rg9W
No caller passes it, so the animation always ran at the SCSS fallback. The `var(--animation-duration, 0.8s)` indirection goes with it: custom properties inherit, so with nothing setting it here an AnimateBoxInOnScroll ancestor would have leaked its own duration — including the shortened one it uses while scrolling fast — into an animation that is not scroll-driven. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01LFDZ3g1sfyyWx8wnn7rg9W
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Actionable comments posted: 1
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Inline comments:
In `@demo/site/src/util/animations/useScrolledToPageBottom.ts`:
- Around line 33-34: Update the initialization flow in the relevant hook to
register the subscriber before performing the first measurement, then invoke
check() to publish the measured state instead of assigning
isScrolledToPageBottom directly. Preserve the existing measurement and
setScrolledToPageBottom behavior while ensuring all subscribers receive the
initial value.
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demo/site/src/app/layout.tsxdemo/site/src/documents/pages/blocks/TeaserBlock.tsxdemo/site/src/util/animations/AnimateBoxInOnLoad.module.scssdemo/site/src/util/animations/AnimateBoxInOnLoad.tsxdemo/site/src/util/animations/AnimateBoxInOnScroll.module.scssdemo/site/src/util/animations/AnimateBoxInOnScroll.tsxdemo/site/src/util/animations/useScrolledToPageBottom.tsdemo/site/src/util/useWindowSize.ts
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@VPS-Obi does this really need my review, since @VPS-MartinKaRo and @mariokemetinger are already reviewing this? |
Measuring into the shared value on mount changed it without notifying the subscribers already mounted. A later check() then saw no change and stayed quiet, so those boxes kept a stale value and never ran the page-bottom fallback. The new subscriber is now seeded from the shared value and check() does the measuring, so a change reaches everyone. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01LFDZ3g1sfyyWx8wnn7rg9W
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@VPS-Ricky no, although your opinion would be invaluable. Let's discuss this in today's meeting. I'll also remove @VPS-thodax's review request since he originally implemented this solution. |
| /** | ||
| * The current viewport size, measured once and shared by all subscribers. | ||
| */ | ||
| export const useWindowSize = (): WindowSize | undefined => { |
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could we also use e.g. https://usehooks-ts.com/react-hook/use-window-size from usehooks-ts
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Yes, but this would add a listener for every block, see #6299 (comment).
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Problem
Blocks in Demo appear instantly, so pages feel flat and static as you scroll. Scroll-in animations are standard on current websites, and Demo showcases what a Dextinity site looks like — it should have them, and afterwards the Starter.
Solution
The animation setup needs no dependencies — CSS transitions plus
IntersectionObserver:AnimateBoxInOnScroll— fades and slides content in when it enters the viewport (direction,delay,offset,fullHeight)AnimateBoxInOnLoad— the same effect on mount, for the stage blocks above the foldAnimateGroup— reveals siblings together once one of them becomes visible;disabledBreakpointsdrops the stagger on breakpoints where it would look wronguseGlobalScrollSpeed— shortens delays and triggers earlier while the page is scrolled fastAnimations are skipped in the block preview and under
prefers-reduced-motion.All page content blocks are animated.
ProductListBlock,NewsListBlockandNewsDetailBlockare left alone: they are unstyled stubs demonstrating block loaders, not designed content.Example
ListBlockchangeStaggering a list needs the item position. Mapping over
data.blocksdirectly would loseListBlock's per-item error boundary and its empty-list preview skeleton, soListBlock'sblockfunction now receives the index as a second argument instead. This is backwards compatible; a changeset is included.Screenshots/screencasts
Recorded against the demo site running locally (Chromium,
prefers-reduced-motiontoggled per clip).All animated blocks, desktop (1440×900)
02allblocksdesktop.webm
All animated blocks, mobile (390×844) —
AnimateGroupstagger disabled onxs/sm05allblocksmobile.webm
prefers-reduced-motion: reduce— content appears instantly, no fade06reducedmotiondesktop.webm
Accordion expand — content inside a collapsed panel animates in on expand
07accordionexpanddesktop.webm
Further information
MediaGalleryBlockanimates only the swiper, not its navigation buttons. Animating them too would need a wrapper to carry their absolute positioning, and introducing one would mean restructuring the SCSS for little gain.Task: DEX-3157