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<!DOCTYPE html>
<meta charset=utf-8>
<title>Pausing an animation</title>
<link rel="help"
href="https://drafts.csswg.org/web-animations/#pausing-an-animation-section">
<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);
await animation.ready;
const startTimeBeforePausing = animation.startTime;
animation.pause();
assert_equals(animation.startTime, startTimeBeforePausing,
'The start time does not change when pausing-pending');
await animation.ready;
assert_equals(animation.startTime, null,
'The start time is unresolved when paused');
}, 'Pausing clears the start time');
promise_test(async t => {
const animation = createDiv(t).animate(null, 100 * MS_PER_SEC);
await animation.ready;
animation.pause();
assert_not_equals(animation.startTime, null,
'The start time is resolved when pause-pending');
animation.play();
assert_not_equals(animation.startTime, null,
'The start time is preserved when a pause is aborted');
}, 'Aborting a pause preserves the start time');
promise_test(async t => {
const animation = createDiv(t).animate(null, 100 * MS_PER_SEC);
const promise = animation.ready;
animation.pause();
const promiseResult = await promise;
assert_equals(promiseResult, animation);
assert_equals(animation.ready, promise);
assert_false(animation.pending, 'No longer pause-pending');
}, 'A pending ready promise should be resolved and not replaced when the'
+ ' animation is paused');
promise_test(async t => {
const animation = createDiv(t).animate(null, 100 * MS_PER_SEC);
// Let animation start roughly half-way through
animation.currentTime = 50 * MS_PER_SEC;
await animation.ready;
// Go pause-pending and also set a pending playback rate
animation.pause();
animation.updatePlaybackRate(0.5);
await animation.ready;
// If the current time was updated using the new playback rate it will jump
// back to 25s but if we correctly used the old playback rate the current time
// will be >50s.
assert_greater_than(animation.currentTime, 50 * MS_PER_SEC);
}, 'A pause-pending animation maintains the current time when applying a'
+ ' pending playback rate');
promise_test(async t => {
// This test does not cover a specific step in the algorithm but serves as a
// high-level sanity check that pausing does, in fact, freeze the current
// time.
const animation = createDiv(t).animate(null, 100 * MS_PER_SEC);
await animation.ready;
animation.pause();
await animation.ready;
const currentTimeAfterPausing = animation.currentTime;
await waitForNextFrame();
assert_equals(animation.currentTime, currentTimeAfterPausing,
'Animation.currentTime is unchanged after pausing');
}, 'The animation\'s current time remains fixed after pausing');
</script>
</body>
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