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WebKit export of https://bugs.webkit.org/show_bug.cgi?id=284534 #49663

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Dec 14, 2024
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WebKit export of https://bugs.webkit.org/show_bug.cgi?id=284534 #49663

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79 changes: 79 additions & 0 deletions scroll-animations/css/siblings-with-anonymous-timelines.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link rel="help" src="https://drafts.csswg.org/scroll-animations-1/#scroll-timelines-anonymous">
<link rel="help" src="https://drafts.csswg.org/scroll-animations-1/#view-timelines-anonymous">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/scroll-animations/scroll-timelines/testcommon.js"></script>
<title>The "animation-timeline" CSS property yields a unique anonymous timeline for siblings matching the same CSS rules</title>
<style>

@keyframes anim {
from { opacity: 0 }
}

.scroller {
overflow-y: scroll;
width: 100px;
height: 100px;
}

.scroller > div {
width: 100%;
height: 100%;

animation: anim auto linear;
}

.scroller.scroll > div {
animation-timeline: scroll();
}

.scroller.view > div {
animation-timeline: view();
}

</style>
</head>
<body>

<div class="scroller scroll">
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
</div>

<div class="scroller view">
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
</div>

<script>

const types = ["scroll", "view"];

types.forEach(type => {
test(t => {
const scroller = document.querySelector(`.scroller.${type}`);

const animations = scroller.getAnimations({ subtree: true });
const numberOfChildren = scroller.childElementCount;
assert_equals(animations.length, numberOfChildren, "There are as many animations as there are children");

const timelines = new Set;
for (const animation of animations)
timelines.add(animation.timeline);
assert_equals(timelines.size, numberOfChildren, `There are as many ${type} timelines as there are children`);
}, `Setting "animation-timeline: ${type}()" yields a unique ${type} timeline for siblings matching the same CSS rules`);
});

</script>
</body>
</html>