web-animations/interfaces/Animation/cancel.html

<!DOCTYPE html>
<meta charset=utf-8>
<title>Animation.cancel</title>
<link rel="help" href="https://drafts.csswg.org/web-animations/#dom-animation-cancel">
<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(
    { transform: ['translate(100px)', 'translate(100px)'] },
    100 * MS_PER_SEC
  );
  return animation.ready.then(() => {
    assert_not_equals(getComputedStyle(div).transform, 'none',
                      'transform style is animated before cancelling');
    animation.cancel();
    assert_equals(getComputedStyle(div).transform, 'none',
                  'transform style is no longer animated after cancelling');
  });
}, 'Animated style is cleared after calling Animation.cancel()');

test(t => {
  const div = createDiv(t);
  const animation = div.animate({ marginLeft: ['100px', '200px'] },
                                100 * MS_PER_SEC);
  animation.effect.updateTiming({ easing: 'linear' });
  animation.cancel();
  assert_equals(getComputedStyle(div).marginLeft, '0px',
                'margin-left style is not animated after cancelling');

  animation.currentTime = 50 * MS_PER_SEC;
  assert_equals(getComputedStyle(div).marginLeft, '150px',
                'margin-left style is updated when cancelled animation is'
                + ' seeked');
}, 'After cancelling an animation, it can still be seeked');

promise_test(t => {
  const div = createDiv(t);
  const animation = div.animate({ marginLeft:['100px', '200px'] },
                                100 * MS_PER_SEC);
  return animation.ready.then(() => {
    animation.cancel();
    assert_equals(getComputedStyle(div).marginLeft, '0px',
                  'margin-left style is not animated after cancelling');
    animation.play();
    assert_equals(getComputedStyle(div).marginLeft, '100px',
                  'margin-left style is animated after re-starting animation');
    return animation.ready;
  }).then(() => {
    assert_equals(animation.playState, 'running',
                  'Animation succeeds in running after being re-started');
  });
}, 'After cancelling an animation, it can still be re-used');

</script>
</body>