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<!DOCTYPE html>
<meta charset=utf-8>
<title>Setting the effect of a scroll-driven animation</title>
<link rel="help"
href="https://drafts.csswg.org/web-animations-1/#setting-the-associated-effect">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<script src="testcommon.js"></script>
<style>
#scroller {
overflow-y: scroll;
height: 100px;
width: 100px;
}
#target {
width: 100%;
height: 1000%;
background-color: green;
}
</style>
<body>
<div id="scroller">
<div id="target"></div>
</div>
<script>
'use strict';
test(() => {
const scroller = document.getElementById("scroller");
const target = document.getElementById("target");
const timeline = new ScrollTimeline({ source: scroller });
const animation = target.animate(null, { timeline });
assert_percents_equal(animation.effect.getComputedTiming().endTime, 100);
animation.effect = new KeyframeEffect(target, { opacity: [0, 1] });
assert_percents_equal(animation.effect.getComputedTiming().endTime, 100);
}, 'Setting the effect of scroll-driven animation computes percentage timing values.');
</script>
</body>
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