web-animations/interfaces/Animation/pause.html

<!DOCTYPE html>
<meta charset=utf-8>
<title>Animation.pause</title>
<link rel="help" href="https://drafts.csswg.org/web-animations/#dom-animation-pause">
<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(t => {
  const div = createDiv(t);
  const animation = div.animate({}, 1000 * MS_PER_SEC);
  let previousCurrentTime = animation.currentTime;

  return animation.ready.then(waitForAnimationFrames(1)).then(() => {
    assert_true(animation.currentTime >= previousCurrentTime,
                'currentTime is initially increasing');
    animation.pause();
    return animation.ready;
  }).then(() => {
    previousCurrentTime = animation.currentTime;
    return waitForAnimationFrames(1);
  }).then(() => {
    assert_equals(animation.currentTime, previousCurrentTime,
                  'currentTime does not increase after calling pause()');
  });
}, 'pause() a running animation');

promise_test(t => {
  const div = createDiv(t);
  const animation = div.animate({}, 1000 * MS_PER_SEC);

  // Go to idle state then pause
  animation.cancel();
  animation.pause();

  assert_equals(animation.currentTime, 0, 'currentTime is set to 0');
  assert_equals(animation.startTime, null, 'startTime is not set');
  assert_equals(animation.playState, 'paused', 'in paused play state');
  assert_true(animation.pending, 'initially pause-pending');

  // Check it still resolves as expected
  return animation.ready.then(() => {
    assert_false(animation.pending, 'no longer pending');
    assert_equals(animation.currentTime, 0,
                  'keeps the initially set currentTime');
  });
}, 'pause() from idle');

promise_test(t => {
  const div = createDiv(t);
  const animation = div.animate({}, 1000 * MS_PER_SEC);
  animation.cancel();
  animation.playbackRate = -1;
  animation.pause();

  assert_equals(animation.currentTime, 1000 * MS_PER_SEC,
                'currentTime is set to the effect end');

  return animation.ready.then(() => {
    assert_equals(animation.currentTime, 1000 * MS_PER_SEC,
                  'keeps the initially set currentTime');
  });
}, 'pause() from idle with a negative playbackRate');

test(t => {
  const div = createDiv(t);
  const animation = div.animate({}, {duration: 1000 * MS_PER_SEC,
                                   iterations: Infinity});
  animation.cancel();
  animation.playbackRate = -1;

  assert_throws_dom('InvalidStateError',
                    () => { animation.pause(); },
                    'Expect InvalidStateError exception on calling pause() ' +
                    'from idle with a negative playbackRate and ' +
                'infinite-duration animation');
}, 'pause() from idle with a negative playbackRate and endless effect');

promise_test(t => {
  const div = createDiv(t);
  const animation = div.animate({}, 1000 * MS_PER_SEC);
  return animation.ready
    .then(animation => {
      animation.finish();
      animation.pause();
      return animation.ready;
    }).then(animation => {
      assert_equals(animation.currentTime, 1000 * MS_PER_SEC,
                    'currentTime after pausing finished animation');
    });
}, 'pause() on a finished animation');

</script>
</body>