web-animations/interfaces/Animation/startTime.html

<!DOCTYPE html>
<meta charset=utf-8>
<title>Animation.startTime</title>
<link rel="help"
href="https://drafts.csswg.org/web-animations/#dom-animation-starttime">
<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';

test(t => {
  const animation = new Animation(new KeyframeEffect(createDiv(t), null),
                                  document.timeline);
  assert_equals(animation.startTime, null, 'startTime is unresolved');
}, 'startTime of a newly created (idle) animation is unresolved');

test(t => {
  const animation = new Animation(new KeyframeEffect(createDiv(t), null),
                                  document.timeline);
  animation.play();
  assert_equals(animation.startTime, null, 'startTime is unresolved');
}, 'startTime of a play-pending animation is unresolved');

test(t => {
  const animation = new Animation(new KeyframeEffect(createDiv(t), null),
                                  document.timeline);
  animation.pause();
  assert_equals(animation.startTime, null, 'startTime is unresolved');
}, 'startTime of a pause-pending animation is unresolved');

test(t => {
  const animation = createDiv(t).animate(null);
  assert_equals(animation.startTime, null, 'startTime is unresolved');
}, 'startTime of a play-pending animation created using Element.animate'
   + ' shortcut is unresolved');

promise_test(t => {
  const animation = createDiv(t).animate(null, 100 * MS_PER_SEC);
  return animation.ready.then(() => {
    assert_greater_than(animation.startTime, 0, 'startTime when running');
  });
}, 'startTime is resolved when running');

test(t => {
  const animation = createDiv(t).animate(null, 100 * MS_PER_SEC);
  animation.cancel();
  assert_equals(animation.startTime, null);
  assert_equals(animation.currentTime, null);
}, 'startTime and currentTime are unresolved when animation is cancelled');

</script>
</body>