<!doctype html>
<meta charset=utf-8>
<title>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';
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 canceling');
transition.cancel();
assert_equals(getComputedStyle(div).marginLeft, div.style.marginLeft,
'transform style is no longer animated after canceling');
}, 'Animated style is cleared after canceling a running CSS transition');
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;
transition.cancel();
assert_equals(getComputedStyle(div).marginLeft, '1000px',
'margin-left style is not animated after canceling');
transition.play();
assert_equals(getComputedStyle(div).marginLeft, '0px',
'margin-left style is animated after re-starting transition');
await transition.ready;
assert_equals(transition.playState, 'running',
'Transition succeeds in running after being re-started');
}, 'After canceling a transition, it can still be re-used');
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;
transition.finish();
transition.cancel();
assert_equals(getComputedStyle(div).marginLeft, '1000px',
'margin-left style is not animated after canceling');
transition.play();
assert_equals(getComputedStyle(div).marginLeft, '0px',
'margin-left style is animated after re-starting transition');
await transition.ready;
assert_equals(transition.playState, 'running',
'Transition succeeds in running after being re-started');
}, 'After canceling a finished transition, it can still be re-used');
test(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];
transition.cancel();
assert_equals(getComputedStyle(div).marginLeft, '1000px',
'margin-left style is not animated after canceling');
// Trigger a change to a transition property and check that this
// doesn't cause the animation to become live again
div.style.transitionDuration = '200s';
getComputedStyle(div).marginLeft;
assert_equals(getComputedStyle(div).marginLeft, '1000px',
'margin-left style is still not animated after updating'
+ ' transition-duration');
assert_equals(transition.playState, 'idle',
'Transition is still idle after updating transition-duration');
}, 'After canceling a transition, updating transition properties doesn\'t make'
+ ' it live again');
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;
assert_equals(transition.playState, 'running');
div.style.display = 'none';
await waitForFrame();
assert_equals(transition.playState, 'idle');
assert_equals(getComputedStyle(div).marginLeft, '1000px');
}, 'Setting display:none on an element cancels its transitions');
promise_test(async t => {
const parentDiv = addDiv(t);
const childDiv = document.createElement('div');
parentDiv.appendChild(childDiv);
childDiv.setAttribute('style', 'margin-left: 0px');
getComputedStyle(childDiv).marginLeft;
childDiv.style.transition = 'margin-left 100s';
childDiv.style.marginLeft = '1000px';
const transition = childDiv.getAnimations()[0];
await transition.ready;
assert_equals(transition.playState, 'running');
parentDiv.style.display = 'none';
await waitForFrame();
assert_equals(transition.playState, 'idle');
assert_equals(getComputedStyle(childDiv).marginLeft, '1000px');
}, 'Setting display:none cancels transitions on a child element');
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;
assert_equals(transition.playState, 'running');
// Set an unrecognized property value
div.style.transitionProperty = 'none';
getComputedStyle(div).marginLeft;
await waitForFrame();
assert_equals(transition.playState, 'idle');
assert_equals(getComputedStyle(div).marginLeft, '1000px');
}, 'Removing a property from transition-property cancels transitions on that '+
'property');
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;
assert_equals(transition.playState, 'running');
div.style.transition = 'margin-left 10s -10s'; // combined duration is zero
// Note that simply setting the combined duration to zero is not enough to
// cancel the transition. We must also update the end value so that the,
// "the end value of the running transition is not equal to the value of the
// property in the after-change style" condition is true.
//
// (And note that the zero combined duration is not strictly necessary to
// cancel the original transition--but it does ensure another transition is
// not generated in its place.)
div.style.marginLeft = '2000px';
getComputedStyle(div).marginLeft;
await waitForFrame();
assert_equals(transition.playState, 'idle');
assert_equals(getComputedStyle(div).marginLeft, '2000px');
}, 'Setting zero combined duration');
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;
assert_equals(transition.playState, 'running');
div.style.marginLeft = '2000px';
getComputedStyle(div).marginLeft;
await waitForFrame();
assert_equals(transition.playState, 'idle');
}, 'Changing style to another interpolable value cancels the original ' +
'transition');
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;
assert_equals(transition.playState, 'running');
div.style.marginLeft = 'auto';
getComputedStyle(div).marginLeft;
await waitForFrame();
assert_equals(div.getAnimations().length, 0,
'There should be no transitions');
assert_equals(transition.playState, 'idle');
}, 'An after-change style value can\'t be interpolated');
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;
assert_equals(transition.playState, 'running');
div.style.marginLeft = '0px';
getComputedStyle(div).marginLeft;
await waitForFrame();
assert_equals(transition.playState, 'idle');
}, 'Reversing a running transition cancels the original transition');
</script>
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