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<!DOCTYPE html>
<title>CSS Animation using progress based timeline</title>
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
<link rel="help" src="https://drafts.csswg.org/css-animations-2/#animation-timeline">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<style>
main > div {
overflow: hidden;
width: 100px;
height: 100px;
}
main > div > div {
height: 200px;
}
@keyframes top {
from { top: 100px; }
to { top: 200px; }
}
#scroller1 {
scroll-timeline: --top_timeline;
}
#element {
animation-name: top;
animation-duration: 10s;
animation-timing-function: linear;
animation-timeline: --top_timeline;
position: absolute;
}
/* Ensure stable expectations if feature is not supported */
@supports not (animation-timeline:--foo) {
#element { animation-play-state: paused; }
}
</style>
<main>
<div id=scroller1>
<div></div>
<div id=element></div>
</div>
</main>
<script>
window.onload = async () => {
promise_test(async (t) => {
await waitForNextFrame();
const anim = document.getAnimations()[0];
await anim.ready;
scroller1.scrollTop = 20;
await waitForNextFrame();
assert_equals(getComputedStyle(element).top, '120px');
}, 'progress based animation timeline works');
};
</script>
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