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<!doctype html>
<meta charset=utf-8>
<title>CSSAnimation.currentTime</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';
promise_test(async t => {
const div = addDiv(t, { class: 'animated-div' });
div.style.animation = 'anim 100s';
const animation = div.getAnimations()[0];
assert_equals(
animation.currentTime,
0,
'Animation.currentTime should be zero when an animation ' +
'is initially created'
);
await animation.ready;
animation.currentTime = 50 * MS_PER_SEC;
assert_time_equals_literal(
animation.currentTime,
50 * MS_PER_SEC,
'Check setting of currentTime actually works'
);
assert_equals(getComputedStyle(div).marginLeft, '150px');
}, 'currentTime can be used to seek a CSS animation');
promise_test(async t => {
const div = addDiv(t, { class: 'animated-div' });
div.style.animation = 'anim 100s';
const animation = div.getAnimations()[0];
await animation.ready;
assert_throws(
new TypeError(),
() => {
animation.currentTime = null;
},
'Expect TypeError exception on trying to set Animation.currentTime to null'
);
}, 'Setting currentTime to null on a CSS animation throws');
</script>
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