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<!DOCTYPE html>
<meta charset="utf-8">
<title>ScrollTimeline snapshotting</title>
<link rel="help" href="https://wicg.github.io/scroll-animations/#avoiding-cycles">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/web-animations/testcommon.js"></script>
<script src="./testcommon.js"></script>
<style>
body {
height: 800px;
width: 800px;
}
</style>
<div id="log"></div>
<script>
'use strict';
promise_test(async t => {
const scroller = document.scrollingElement;
const maxScroll = scroller.scrollHeight - scroller.clientHeight;
const timeline = new ScrollTimeline({source: scroller});
scroller.scrollTo(0, 0);
assert_equals(scroller.scrollTop, 0, "verify test pre-condition");
scroller.scrollBy({top: 100, behavior: 'smooth'});
// Wait for the scroll to change.
const startScroll = scroller.scrollTop;
do {
await waitForNextFrame();
} while(scroller.scrollTop == startScroll);
assert_percents_equal(
timeline.currentTime,
(scroller.scrollTop / maxScroll) * 100,
'Scroll timeline current time corresponds to the scroll position.');
}, 'ScrollTimeline current time is updated after programmatic animated ' +
'scroll.');
</script>
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