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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>
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