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test: wait for hero motion preference events #1428

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Merged
tannerlinsley merged 1 commit into from
Oct 26, 2026
Merged

test: wait for hero motion preference events #1428

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17 changes: 17 additions & 0 deletions tests/hero-media.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -285,11 +285,28 @@ test(
'0',
)

// Chrome can pause hidden autoplay media before dispatching the preference
// change. Wait for that event so consecutive changes are not coalesced.
await normal.page.evaluate(() => {
window
.matchMedia('(prefers-reduced-motion: reduce)')
.addEventListener('change', (event) => {
document.documentElement.dataset.reducedMotion = String(
event.matches,
)
})
})
await normal.page.emulateMedia({ reducedMotion: 'reduce' })
await normal.page.waitForFunction(
() => document.documentElement.dataset.reducedMotion === 'true',
)
await normal.page.waitForFunction(
() => document.querySelector('video')?.paused === true,
)
await normal.page.emulateMedia({ reducedMotion: 'no-preference' })
await normal.page.waitForFunction(
() => document.documentElement.dataset.reducedMotion === 'false',
)
assert.equal(
await normalVideo.evaluate((video) => {
if (!(video instanceof HTMLVideoElement)) {
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