KeyframeEffect-target.tentative.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-animations/KeyframeEffect-target.tentative.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset=utf-8>

<title>CSSAnimation.effect.target</title>

<!-- TODO: Add a more specific link for this once it is specified. -->

<link rel="help" href="https://drafts.csswg.org/css-animations-2/">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="support/testcommon.js"></script>

<style>

@keyframes anim { }

::before {

  content: ''

::after {

  content: ''

</style>

<div id="log"></div>

<script>

'use strict';

test(t => {

  const div = addDiv(t);

  div.style.animation = 'anim 100s';

  const animation = div.getAnimations()[0];

  assert_equals(animation.effect.target, div,

    'Animation.target is the animatable div');

}, 'Returned CSS animations have the correct effect target');

test(t => {

  addStyle(t, { '.after::after': 'animation: anim 10s, anim 100s;' });

  const div = addDiv(t, { class: 'after' });

  const anims = document.getAnimations();

  assert_equals(anims.length, 2,

                'Got animations running on ::after pseudo element');

  assert_equals(anims[0].effect.target, anims[1].effect.target,

                'Both animations return the same target object');

}, 'effect.target should return the same CSSPseudoElement object each time');

test(t => {

  addStyle(t, { '.after::after': 'animation: anim 10s;' });

  const div = addDiv(t, { class: 'after' });

  const pseudoTarget = document.getAnimations()[0].effect.target;

  const effect = new KeyframeEffect(pseudoTarget,

                                    { background: ["blue", "red"] },

                                    3 * MS_PER_SEC);

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

  newAnim.play();

  const anims = document.getAnimations();

  assert_equals(anims.length, 2,

                'Got animations running on ::after pseudo element');

  assert_not_equals(anims[0], newAnim,

                    'The scriped-generated animation appears last');

  assert_equals(newAnim.effect.target, pseudoTarget,

                'The effect.target of the scripted-generated animation is ' +

                'the same as the one from the argument of ' +

                'KeyframeEffect constructor');

  assert_equals(anims[0].effect.target, newAnim.effect.target,

                'Both animations return the same target object');

}, 'effect.target from the script-generated animation should return the same ' +

   'CSSPseudoElement object as that from the CSS generated animation');

</script>