CSSTransition-finished.tentative.html

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

<!doctype html>

<meta charset=utf-8>

<title>CSSTransition.finished</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>

<style>

.animated-div {

  margin-left: 100px;

  transition: margin-left 100s linear 100s;

</style>

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

<script>

'use strict';

promise_test(async t => {

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

  getComputedStyle(div).marginLeft;

  div.style.marginLeft = '200px';

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

  animation.finish();

  await animation.finished;

  animation.play();

  const marginLeft = parseFloat(getComputedStyle(div).marginLeft);

  assert_equals(

    marginLeft,

    100,

    'Replaying a finished transition should update the target element\'s style'

);

}, 'Restarting a finished transition rewinds playback');

</script>