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<!DOCTYPE html>
<meta charset=utf-8>
<title>Setting the playback rate of an animation</title>
<link rel="help" href="https://drafts.csswg.org/web-animations/#setting-the-playback-rate-of-an-animation">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../../testcommon.js"></script>
<body>
<div id="log"></div>
<script>
'use strict';
promise_test(async t => {
const animation = createDiv(t).animate(null, 100 * MS_PER_SEC);
animation.playbackRate = 2;
await animation.ready;
const previousAnimationCurrentTime = animation.currentTime;
const previousTimelineCurrentTime = animation.timeline.currentTime;
await waitForAnimationFrames(1);
const animationCurrentTimeDifference =
animation.currentTime - previousAnimationCurrentTime;
const timelineCurrentTimeDifference =
animation.timeline.currentTime - previousTimelineCurrentTime;
assert_times_equal(
animationCurrentTimeDifference,
timelineCurrentTimeDifference * animation.playbackRate,
'The current time should increase two times faster than timeline'
);
}, 'The playback rate affects the rate of progress of the current time');
test(t => {
const animation = createDiv(t).animate(null, 100 * MS_PER_SEC);
animation.currentTime = 50 * MS_PER_SEC;
animation.playbackRate = 2;
assert_time_equals_literal(animation.currentTime, 50 * MS_PER_SEC);
}, 'Setting the playback rate while play-pending preserves the current time');
promise_test(async t => {
const animation = createDiv(t).animate(null, 100 * MS_PER_SEC);
animation.currentTime = 50 * MS_PER_SEC;
await animation.ready;
animation.playbackRate = 2;
assert_greater_than_equal(animation.currentTime, 50 * MS_PER_SEC);
assert_less_than(animation.currentTime, 100 * MS_PER_SEC);
}, 'Setting the playback rate while playing preserves the current time');
promise_test(async t => {
const animation = createDiv(t).animate(null, 100 * MS_PER_SEC);
animation.currentTime = 50 * MS_PER_SEC;
animation.updatePlaybackRate(2);
animation.playbackRate = 1;
await animation.ready;
assert_equals(animation.playbackRate, 1);
}, 'Setting the playback rate should clear any pending playback rate');
</script>
</body>
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