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<!DOCTYPE html>
<meta charset="utf-8">
<title>ScrollTimeline current time algorithm - root scroller</title>
<link rel="help" href="https://wicg.github.io/scroll-animations/#current-time-algorithm">
<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>
html {
/* Ensure the document is scrollable. */
min-height: 100%;
min-width: 100%;
padding-bottom: 100px;
padding-right: 100px;
}
</style>
<script>
promise_test(async t => {
const scroller = document.scrollingElement;
// Allow layout to finish, otherwise the scroller isn't set up by the time
// we check the currentTime of the scroll timeline.
await waitForNextFrame();
const blockScrollTimeline = new ScrollTimeline(
{ source: scroller, axis: 'block' });
const inlineScrollTimeline = new ScrollTimeline(
{ source: scroller, axis: 'inline' });
// Wait for new animation frame which allows the timeline to fully initialize
await waitForNextFrame();
// Unscrolled, both timelines should read a currentTime of 0.
assert_percents_equal(blockScrollTimeline.currentTime, 0);
assert_percents_equal(inlineScrollTimeline.currentTime, 0);
// Now do some scrolling and make sure that the ScrollTimelines update.
scroller.scrollTop = 50;
scroller.scrollLeft = 75;
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
assert_percents_equal(blockScrollTimeline.currentTime, 50);
assert_percents_equal(inlineScrollTimeline.currentTime, 75);
}, 'currentTime calculates the correct time for a document.scrollingElement source');
</script>
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