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<!DOCTYPE html>
<meta charset=utf-8>
<title>Playing an animation</title>
<link rel="help"
href="https://drafts.csswg.org/web-animations/#playing-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';
test(t => {
const animation = createDiv(t).animate(null, 100 * MS_PER_SEC);
animation.currentTime = 1 * MS_PER_SEC;
assert_time_equals_literal(animation.currentTime, 1 * MS_PER_SEC);
animation.play();
assert_time_equals_literal(animation.currentTime, 1 * MS_PER_SEC);
}, 'Playing a running animation leaves the current time unchanged');
test(t => {
const animation = createDiv(t).animate(null, 100 * MS_PER_SEC);
animation.finish();
assert_time_equals_literal(animation.currentTime, 100 * MS_PER_SEC);
animation.play();
assert_time_equals_literal(animation.currentTime, 0);
}, 'Playing a finished animation seeks back to the start');
test(t => {
const animation = createDiv(t).animate(null, 100 * MS_PER_SEC);
animation.playbackRate = -1;
animation.currentTime = 0;
assert_time_equals_literal(animation.currentTime, 0);
animation.play();
assert_time_equals_literal(animation.currentTime, 100 * MS_PER_SEC);
}, 'Playing a finished and reversed animation seeks to end');
test(t => {
const animation = createDiv(t).animate(null, 100 * MS_PER_SEC);
animation.cancel();
const promise = animation.ready;
animation.play();
assert_not_equals(animation.ready, promise);
}, 'The ready promise should be replaced if the animation is not already'
+ ' pending');
promise_test(async t => {
const animation = createDiv(t).animate(null, 100 * MS_PER_SEC);
const promise = animation.ready;
const promiseResult = await promise;
assert_equals(promiseResult, animation);
assert_equals(animation.ready, promise);
}, 'A pending ready promise should be resolved and not replaced when the'
+ ' animation enters the running state');
promise_test(async t => {
// Seek animation beyond target end
const animation = createDiv(t).animate(null, 100 * MS_PER_SEC);
animation.currentTime = -100 * MS_PER_SEC;
await animation.ready;
// Set pending playback rate to the opposite direction
animation.updatePlaybackRate(-1);
assert_true(animation.pending);
assert_equals(animation.playbackRate, 1);
// When we play, we should seek to the target end, NOT to zero (which
// is where we would seek to if we used the playbackRate of 1.
animation.play();
assert_time_equals_literal(animation.currentTime, 100 * MS_PER_SEC);
}, 'A pending playback rate is used when determining auto-rewind behavior');
</script>
</body>
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