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<!doctype html>
<meta charset=utf-8>
<title>CSSAnimation.startTime</title>
<!-- TODO: Add a more specific link for this once it is specified. -->
<link rel="help" href="https://drafts.csswg.org/css-animations-2/#cssanimation">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/testcommon.js"></script>
<style>
.animated-div {
margin-left: 10px;
/* Make it easier to calculate expected values: */
animation-timing-function: linear ! important;
}
@keyframes anim {
from { margin-left: 100px; }
to { margin-left: 200px; }
}
</style>
<div id="log"></div>
<script type="text/javascript">
'use strict';
test(t => {
const div = addDiv(t, { 'class': 'animated-div' });
div.style.animation = 'anim 100s 100s';
const animation = div.getAnimations()[0];
const timelineTime = animation.timeline.currentTime;
animation.startTime = timelineTime;
assert_times_equal(animation.startTime, timelineTime,
'Check setting of startTime actually works');
}, 'The start time of a CSS animation can be set');
promise_test(async t => {
const div = addDiv(t, { 'class': 'animated-div' });
div.style.animation = 'anim 100s 100s';
const animation = div.getAnimations()[0];
// Seek to the half-way point
animation.startTime = animation.timeline.currentTime - 150 * MS_PER_SEC;
assert_equals(getComputedStyle(div).marginLeft, '150px');
}, 'The start time can be set to seek a CSS animation');
promise_test(async t => {
const div = addDiv(t, { class: 'animated-div' });
const eventWatcher = new EventWatcher(t, div, [
'animationstart',
'animationend',
]);
div.style.animation = 'anim 100s 100s';
const animation = div.getAnimations()[0];
await animation.ready;
animation.startTime = animation.timeline.currentTime - 100 * MS_PER_SEC;
await eventWatcher.wait_for('animationstart');
animation.startTime = animation.timeline.currentTime - 200 * MS_PER_SEC;
await eventWatcher.wait_for('animationend');
}, 'Seeking a CSS animation using the start time dispatches animation events');
</script>
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