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<!DOCTYPE html>
<meta charset=utf-8>
<title>Seamlessly updating the playback rate of an animation</title>
<link rel="help"
href="https://drafts.csswg.org/web-animations-1/#seamlessly-updating-the-playback-rate-of-an-animation">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<script src="testcommon.js"></script>
<style>
.scroller {
overflow: auto;
height: 100px;
width: 100px;
will-change: transform;
}
.contents {
height: 1000px;
width: 100%;
}
</style>
<body>
<script>
'use strict';
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
animation.play();
await animation.ready;
animation.currentTime = CSSNumericValue.parse("50%");
animation.updatePlaybackRate(0.5);
await animation.ready;
assert_percents_equal(animation.currentTime, 50,
'Reducing the playback rate should not change the ' +
'current time of a playing animation');
animation.updatePlaybackRate(2);
await animation.ready;
assert_percents_equal(animation.currentTime, 50,
'Increasing the playback rate should not change the ' +
'current time of a playing animation');
}, 'Updating the playback rate maintains the current time');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
animation.play();
await animation.ready;
assert_false(animation.pending);
animation.updatePlaybackRate(2);
assert_true(animation.pending);
}, 'Updating the playback rate while running makes the animation pending');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
animation.play();
animation.currentTime = CSSNumericValue.parse("50%");
assert_true(animation.pending);
animation.updatePlaybackRate(0.5);
// Check that the hold time is updated as expected
assert_percents_equal(animation.currentTime, 50);
await animation.ready;
// As above, check that the currentTime is not calculated by simply
// substituting in the updated playbackRate without updating the startTime.
assert_percents_equal(animation.currentTime, 50,
'Reducing the playback rate should not change the ' +
'current time of a play-pending animation');
}, 'Updating the playback rate on a play-pending animation maintains the ' +
'current time');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
animation.play();
animation.currentTime = CSSNumericValue.parse("50%");
await animation.ready;
animation.pause();
animation.updatePlaybackRate(0.5);
assert_percents_equal(animation.currentTime, 50);
}, 'Updating the playback rate on a pause-pending animation maintains the ' +
'current time');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
animation.play();
animation.updatePlaybackRate(2);
animation.updatePlaybackRate(3);
animation.updatePlaybackRate(4);
assert_equals(animation.playbackRate, 1);
await animation.ready;
assert_equals(animation.playbackRate, 4);
}, 'If a pending playback rate is set multiple times, the latest wins');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
animation.play();
animation.cancel();
animation.updatePlaybackRate(2);
assert_equals(animation.playbackRate, 2);
assert_false(animation.pending);
}, 'In the idle state, the playback rate is applied immediately');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
animation.pause();
await animation.ready;
animation.updatePlaybackRate(2);
assert_equals(animation.playbackRate, 2);
assert_false(animation.pending);
}, 'In the paused state, the playback rate is applied immediately');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
animation.play();
animation.finish();
assert_percents_equal(animation.currentTime, 100);
assert_false(animation.pending);
animation.updatePlaybackRate(2);
assert_equals(animation.playbackRate, 2);
assert_percents_equal(animation.currentTime, 100);
assert_false(animation.pending);
}, 'Updating the playback rate on a finished animation maintains the current ' +
'time');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
animation.play();
animation.finish();
assert_percents_equal(animation.currentTime, 100);
assert_false(animation.pending);
animation.updatePlaybackRate(0);
assert_equals(animation.playbackRate, 0);
assert_percents_equal(animation.currentTime, 100);
assert_false(animation.pending);
}, 'Updating the playback rate to zero on a finished animation maintains the ' +
'current time');
</script>
</body>
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