CSSTransition-ready.tentative.html

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

<!doctype html>

<meta charset=utf-8>

<title>CSSTransition.ready</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';

promise_test(async t => {

  const div = addDiv(t);

  // Set up pending transition

  div.style.transform = 'translate(0px)';

  getComputedStyle(div).transform;

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

  div.style.transform = 'translate(10px)';

  getComputedStyle(div).transform;

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

  assert_true(animation.pending, 'Animation is initially pending');

  const readyPromise = animation.ready;

  // Now remove transform from transition-property and flush styles

  div.style.transitionProperty = 'none';

  getComputedStyle(div).transitionProperty;

  try {

    await readyPromise;

    assert_unreached('ready promise was fulfilled');

  } catch (err) {

    assert_equals(err.name, 'AbortError',

                  'ready promise is rejected with AbortError');

    assert_equals(animation.playState, 'idle',

                  'Animation is idle after transition was canceled');

}, 'ready promise is rejected when a transition is canceled by updating'

   + ' transition-property');

promise_test(async t => {

  const div = addDiv(t);

  // Set up pending transition

  div.style.marginLeft = '0px';

  getComputedStyle(div).marginLeft;

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

  div.style.marginLeft = '100px';

  getComputedStyle(div).marginLeft;

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

  assert_true(animation.pending, 'Animation is initially pending');

  const readyPromise = animation.ready;

  // Update the transition to animate to something not-interpolable

  div.style.marginLeft = 'auto';

  getComputedStyle(div).marginLeft;

  try {

    await readyPromise;

    assert_unreached('ready promise was fulfilled');

  } catch (err) {

    assert_equals(err.name, 'AbortError',

                  'ready promise is rejected with AbortError');

    assert_equals(animation.playState, 'idle',

                  'Animation is idle after transition was canceled');

}, 'ready promise is rejected when a transition is canceled by changing'

   + ' the transition property to something not interpolable');

</script>