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