wpt/css/css-transitions/CSSTransition-not-canceling.tentative.html at master · web-platform-tests/wpt · GitHub

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<!doctype html>
<meta charset=utf-8>
<title>Not canceling a CSS transition</title>
<link rel="help" href="https://drafts.csswg.org/css-transitions/#starting">
<!-- 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';

const runDisplayNoneTransitionTest = displayTransitionStyle => {
    promise_test(async t => {
      const div = addDiv(t, { style: 'margin-left: 0px' });
      getComputedStyle(div).marginLeft;

      div.style.transition = 'margin-left 100s';
      div.style.marginLeft = '1000px';

      const transition = div.getAnimations()[0];
      await transition.ready;
      await waitForFrame();

      assert_not_equals(getComputedStyle(div).marginLeft, '1000px',
                        'transform style is animated before setting "display: none"');

      div.style.transition = `${div.style.transition}, ${displayTransitionStyle}`;
      div.style.display = 'none';

      assert_not_equals(getComputedStyle(div).marginLeft, '1000px',
                        'transform style is animated after setting "display: none"');
    }, `Setting "display: none" with "display" set to transition using "${displayTransitionStyle}" does not cancel running transitions`);
};

runDisplayNoneTransitionTest('display 100s allow-discrete');
runDisplayNoneTransitionTest('display 100s, all allow-discrete 100s');

</script>