File: setting-the-current-time-of-an-animation.html

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<!doctype html>
<meta charset=utf-8>
<title>Setting the current time of an animation</title>
<link rel="help"
  href="https://drafts.csswg.org/web-animations-1/#setting-the-current-time-of-an-animation">
<script src='/resources/testharness.js'></script>
<script src='/resources/testharnessreport.js'></script>
<script src='../../testcommon.js'></script>
<body>
<div id='log'></div>
<script>
'use strict';

promise_test(async t => {
  const anim = createDiv(t).animate(null, 100 * MS_PER_SEC);
  await anim.ready;
  anim.pause();

  // We should be pause-pending now
  assert_true(anim.pending);
  assert_equals(anim.playState, 'paused');

  // Apply a pending playback rate
  anim.updatePlaybackRate(2);
  assert_equals(anim.playbackRate, 1);

  // Setting the current time should apply the pending playback rate
  anim.currentTime = 50 * MS_PER_SEC;
  assert_equals(anim.playbackRate, 2);
  assert_false(anim.pending);

  // Sanity check that the current time is preserved
  assert_time_equals_literal(anim.currentTime, 50 * MS_PER_SEC);
}, 'Setting the current time of a pausing animation applies a pending playback'
   + ' rate');

</script>
</body>