copy-constructor-revert-layer.html

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This test has a WPT meta file that expects 2 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /web-animations/interfaces/KeyframeEffect/copy-constructor-revert-layer.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset=utf-8>

<title>KeyframeEffect copy constructor: revert-layer in keyframes stays dynamic</title>

<link rel="help"

      href="https://drafts.csswg.org/web-animations/#dom-keyframeeffect-keyframeeffect-source">

<link rel="help"

      href="https://drafts.csswg.org/css-cascade-5/#revert-layer">

<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';

const KEYFRAMES = [ { width: 'revert-layer' }, { width: '200px' } ];

const TIMING = { duration: 3600 * MS_PER_SEC,

                 easing: 'steps(2, start)',

                 fill: 'both' };

function pausedAtStart(effect) {

  const animation = new Animation(effect, document.timeline);

  animation.pause();

  animation.currentTime = 0;

  return animation;

test(t => {

  const target = createDiv(t);

  target.style.width = '100px';

  const effect = new KeyframeEffect(target, KEYFRAMES, TIMING);

  assert_equals(effect.getKeyframes()[0].width, 'revert-layer',

                'revert-layer is retained as the first keyframe value');

  pausedAtStart(effect);

  assert_equals(getComputedStyle(target).width, '150px',

                'revert-layer resolves to the author value (100px)');

  target.style.width = '120px';

  assert_equals(getComputedStyle(target).width, '160px',

                'revert-layer resolves to the new author value (120px)');

}, 'revert-layer in a keyframe follows the author value as it changes');

test(t => {

  const target = createDiv(t);

  target.style.width = '100px';

  const source = new KeyframeEffect(target, KEYFRAMES, TIMING);

  const sourceAnimation = pausedAtStart(source);

  assert_equals(getComputedStyle(target).width, '150px',

                'source effect resolves revert-layer to the author value');

  const copy = new KeyframeEffect(source);

  assert_equals(copy.getKeyframes()[0].width, 'revert-layer',

                'the copy retains revert-layer as the first keyframe value');

  sourceAnimation.cancel();

  pausedAtStart(copy);

  assert_equals(getComputedStyle(target).width, '150px',

                'copied effect resolves revert-layer to the author value');

  target.style.width = '120px';

  assert_equals(getComputedStyle(target).width, '160px',

                'copied effect resolves revert-layer to the new author value');

}, 'revert-layer in a keyframe stays dynamic through the KeyframeEffect copy constructor');

</script>

</body>