KeyframeEffect-target.tentative.html

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

<!doctype html>

<meta charset=utf-8>

<title>CSSTransition.effect.target</title>

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

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

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

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

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

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

<script>

'use strict';

test(t => {

  const div = addDiv(t);

  div.style.left = '0px';

  getComputedStyle(div).transitionProperty;

  div.style.transition = 'left 100s';

  div.style.left = '100px';

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

  assert_equals(animation.effect.target, div,

    'Animation.target is the animatable div');

}, 'Returned CSS transitions have the correct Animation.target');

test(t => {

  addStyle(t, { '.init::after': 'content: ""; width: 0px; height: 0px; ' +

                                'transition: all 10s;',

                '.change::after': 'width: 100px; height: 100px;' });

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

  getComputedStyle(div).width;

  div.classList.add('change');

  const anims = document.getAnimations();

  assert_equals(anims.length, 2,

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

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

                'Both transitions return the same target object');

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

test(t => {

  addStyle(t, { '.init::after': 'content: ""; width: 0px; transition: all 10s;',

                '.change::after': 'width: 100px;' });

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

  getComputedStyle(div).width;

  div.classList.add('change');

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

  const effect = new KeyframeEffect(pseudoTarget,

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

                                    3000);

  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 the transition and the scripted-generated animation ' +

                'return the same target object');

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

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

</script>