current-time-root-scroller.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /scroll-animations/scroll-timelines/current-time-root-scroller.html - WPT Dashboard Interop Dashboard

<!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>