css/css-transitions/Element-getAnimations.tentative.html

<!doctype html>
<meta charset=utf-8>
<title>Element.getAnimations() for CSS transitions</title>
<link rel="help" href="https://drafts.csswg.org/css-transitions-2/#animation-composite-order">
<!-- 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);

  div.style.left = '0px';
  div.style.top = '0px';
  getComputedStyle(div).transitionProperty;

  div.style.transition = 'all 100s';
  div.style.left = '100px';
  div.style.top = '100px';

  assert_equals(div.getAnimations().length, 2);
}, 'getAnimations returns one Animation per transitioning property');

test(t => {
  const div = addDiv(t, { style: 'left: 0px; transition: all 100s' });

  getComputedStyle(div).left;
  div.style.left = '100px';

  assert_class_string(div.getAnimations()[0], 'CSSTransition',
                      'Interface of returned animation is CSSTransition');
}, 'getAnimations returns CSSTransition objects for CSS Transitions');

promise_test(async t => {
  const div = addDiv(t);

  div.style.left = '0px';
  getComputedStyle(div).left;
  div.style.transition = 'all 0.01s';
  div.style.left = '100px';
  const animation = div.getAnimations()[0];

  await animation.finished;

  assert_equals(div.getAnimations().length, 0);
}, 'getAnimations does not return finished CSS Transitions');

test(t => {
  const div = addDiv(t);

  // animation-duration is not animatable
  div.style.animationDuration = '10s';
  getComputedStyle(div).animationDuration;

  div.style.transition = 'all 100s';
  div.style.animationDuration = '100s';

  assert_equals(div.getAnimations().length, 0);
}, 'getAnimations does not return a transition for a non-animatable property');

test(t => {
  const div = addDiv(t);

  div.style.setProperty('-vendor-unsupported', '0px', '');
  getComputedStyle(div).transitionProperty;
  div.style.transition = 'all 100s';
  div.style.setProperty('-vendor-unsupported', '100px', '');

  assert_equals(div.getAnimations().length, 0);
}, 'getAnimations does not return a transition for an unsupposed property');

test(t => {
  const div = addDiv(t, { style: 'transform: translate(0px); ' +
                                 'opacity: 0; ' +
                                 'border-width: 0px; ' + // Shorthand
                                 'border-style: solid' });
  getComputedStyle(div).transform;

  div.style.transition = 'all 100s';
  div.style.transform = 'translate(100px)';
  div.style.opacity = '1';
  div.style.borderWidth = '1px';

  const animations = div.getAnimations();
  assert_equals(animations.length, 6,
                'Generated expected number of transitions');
  assert_equals(animations[0].transitionProperty, 'border-bottom-width');
  assert_equals(animations[1].transitionProperty, 'border-left-width');
  assert_equals(animations[2].transitionProperty, 'border-right-width');
  assert_equals(animations[3].transitionProperty, 'border-top-width');
  assert_equals(animations[4].transitionProperty, 'opacity');
  assert_equals(animations[5].transitionProperty, 'transform');
}, 'getAnimations sorts simultaneous transitions by name');

test(t => {
  const div = addDiv(t, { style: 'transform: translate(0px); ' +
                                 'opacity: 0' });
  getComputedStyle(div).transform;

  div.style.transition = 'all 100s';
  div.style.transform = 'translate(100px)';
  assert_equals(div.getAnimations().length, 1,
                'Initially there is only one (transform) transition');
  div.style.opacity = '1';
  assert_equals(div.getAnimations().length, 2,
                'Then a second (opacity) transition is added');

  const animations = div.getAnimations();
  assert_equals(animations[0].transitionProperty, 'transform');
  assert_equals(animations[1].transitionProperty, 'opacity');
}, 'getAnimations sorts transitions by when they were generated');

</script>