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<!DOCTYPE html>
<html id="top">
<meta charset="utf-8">
<title>View timeline delay</title>
<link rel="help" href="https://drafts.csswg.org/scroll-animations-1/#viewtimeline-interface">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<script src="/scroll-animations/scroll-timelines/testcommon.js"></script>
<script src="/scroll-animations/view-timelines/testcommon.js"></script>
<style>
#target {
margin: 200vh;
background-color: green;
height: 100px;
width: 100px;
}
</style>
<body>
<div id="target"></div>
</body>
<script type="text/javascript">
promise_test(async t => {
const timeline = new ViewTimeline({ subject: target });
const anim = target.animate({ opacity: [0, 1 ] },
{ timeline: timeline,
rangeStart: "entry 0%",
rangeEnd: "entry 100%",
fill: "both" });
const scroller = document.scrollingElement;
const scrollRange = scroller.scrollHeight - scroller.clientHeight;
await anim.ready;
await waitForNextFrame();
scroller.scrollTop = scrollRange / 2;
await waitForNextFrame();
assert_equals(getComputedStyle(target).opacity, "1");
}, 'Test view-timeline with document scrolling element.');
</script>
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