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<!doctype html>
<meta charset=utf-8>
<title>CSSTransition.effect</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';
div.style.transition = 'left 100s';
getComputedStyle(div).left;
div.style.left = '100px';
const transition = div.getAnimations()[0];
transition.effect = null;
assert_equals(transition.transitionProperty, 'left');
}, 'After setting a transition\'s effect to null, it still reports the'
+ ' original transition property');
promise_test(async t => {
const div = addDiv(t);
div.style.left = '0px';
div.style.transition = 'left 100s';
getComputedStyle(div).left;
div.style.left = '100px';
const transition = div.getAnimations()[0];
await transition.ready;
transition.effect = null;
assert_equals(transition.playState, 'finished');
}, 'After setting a transition\'s effect to null, it becomes finished');
promise_test(async t => {
const div = addDiv(t);
div.style.left = '0px';
div.style.transition = 'left 100s';
getComputedStyle(div).left;
div.style.left = '100px';
const transition = div.getAnimations()[0];
await transition.ready;
transition.effect = null;
assert_equals(getComputedStyle(div).left, '100px');
}, 'After setting a transition\'s effect to null, style is updated');
promise_test(async t => {
const div = addDiv(t);
div.style.left = '0px';
div.style.width = '0px';
div.style.transition = 'left 100s';
getComputedStyle(div).left;
div.style.left = '100px';
const transition = div.getAnimations()[0];
await transition.ready;
transition.currentTime = 50 * MS_PER_SEC;
transition.effect = new KeyframeEffect(div,
{ left: [ '0px' , '100px'] },
20 * MS_PER_SEC);
assert_equals(transition.playState, 'finished');
}, 'After setting a new keyframe effect with a shorter duration,'
+ ' the transition becomes finished');
promise_test(async t => {
const div = addDiv(t);
div.style.left = '0px';
div.style.width = '0px';
div.style.transition = 'left 100s';
getComputedStyle(div).left;
div.style.left = '100px';
const transition = div.getAnimations()[0];
transition.effect = new KeyframeEffect(div,
{ marginLeft: [ '0px' , '100px'] },
100 * MS_PER_SEC);
assert_equals(transition.transitionProperty, 'left');
}, 'After setting a new keyframe effect targeting different properties,'
+ ' the transition continues to report the original transition property');
promise_test(async t => {
const div = addDiv(t);
div.style.left = '0px';
div.style.width = '0px';
div.style.transition = 'left 100s';
getComputedStyle(div).left;
div.style.left = '100px';
const transition = div.getAnimations()[0];
assert_true(transition.pending);
transition.effect = new KeyframeEffect(div,
{ marginLeft: [ '0px' , '100px'] },
100 * MS_PER_SEC);
assert_equals(transition.transitionProperty, 'left');
assert_true(transition.pending);
// As a sanity check, check that the transition actually exits the
// pending state.
await transition.ready;
assert_false(transition.pending);
}, 'After setting a new keyframe effect on a play-pending transition,'
+ ' the transition remains pending');
</script>
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