play-animation.html

mozilla-central/testing/web-platform/tests/scroll-animations/scroll-timelines/play-animation.html

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Test Info: Warnings

This test has a WPT meta file that expects 16 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /scroll-animations/scroll-timelines/play-animation.html - WPT Dashboard Interop Dashboard

<!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="/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);

  animation.play();

  assert_equals(animation.startTime, null);

  await animation.ready;

  assert_percents_equal(animation.startTime, 0);

  animation.cancel();

  const scroller = animation.timeline.source;

  const maxScroll = scroller.scrollHeight - scroller.clientHeight;

  scroller.scrollTop = maxScroll / 2;

  animation.play();

  await animation.ready;

  assert_percents_equal(animation.currentTime, 50);

}, 'Playing an animations aligns the start time with the start of the active ' +

   'range');

promise_test(async t => {

  const animation = createScrollLinkedAnimation(t);

  animation.playbackRate = -1;

  animation.play();

  await animation.ready;

  assert_percents_equal(animation.startTime, 100);

}, 'Playing an animations with a negative playback rate aligns the start ' +

   'time with the end of the active range');

promise_test(async t => {

  const animation = createScrollLinkedAnimation(t);

  animation.play();

  animation.startTime = CSSNumericValue.parse("10%");

  await animation.ready;

  assert_percents_equal(animation.startTime, 10);

}, 'Start time set while play pending is preserved.');

promise_test(async t => {

  const animation = createScrollLinkedAnimation(t);

  animation.play();

  animation.currentTime = CSSNumericValue.parse("10%");

  await animation.ready;

  assert_percents_equal(animation.currentTime, 10);

}, 'Current time set while play pending is preserved.');

promise_test(async t => {

  const animation = createScrollLinkedAnimation(t);

  animation.play();

  await animation.ready;

  animation.currentTime = CSSNumericValue.parse("10%");

  assert_percents_equal(animation.currentTime, 10);

  animation.play();

  await animation.ready;

  assert_percents_equal(animation.currentTime, 0);

}, 'Playing a running animation resets a sticky start time');

promise_test(async t => {

  const animation = createScrollLinkedAnimation(t);

  animation.play();

  animation.finish();

  assert_percents_equal(animation.currentTime, 100);

  animation.play();

  await animation.ready;

  assert_percents_equal(animation.currentTime, 0);

}, 'Playing a finished animation restarts the animation aligned at the start');

promise_test(async t => {

  const animation = createScrollLinkedAnimation(t);

  animation.play();

  animation.playbackRate = -1;

  animation.currentTime = CSSNumericValue.parse("0%");

  assert_percents_equal(animation.currentTime, 0);

  animation.play();

  await animation.ready;

  assert_percents_equal(animation.currentTime, 100);

}, 'Playing a finished and reversed animation restarts the animation aligned ' +

   'at the end');

promise_test(async t => {

  const animation = createScrollLinkedAnimation(t);

  animation.play();

  animation.finish();

  await animation.finished;

  // Start time is now sticky since modified by an explicit API call.

  // All current time calculations will be based on the new start time

  // while running.

  assert_percents_equal(animation.startTime, -100,

                        'start time when finished');

  assert_percents_equal(animation.currentTime, 100,

                        'current time when finished');

  const scroller = animation.timeline.source;

  const maxScroll = scroller.scrollHeight - scroller.clientHeight;

  scroller.scrollTop = maxScroll / 2;

  await waitForNextFrame();

  assert_percents_equal(animation.startTime, -100,

                        'start time after scrolling a finished animation');

  // Clamped at effect end time.

  assert_percents_equal(animation.currentTime, 100,

                        'current time after scrolling a finished animation');

  // Initiate a pause then abort it

  animation.pause();

  animation.play();

  // Wait to return to running state

  await animation.ready;

  assert_percents_equal(animation.startTime, 0,

      'After aborting a pause when finished, the start time should no ' +

      'longer be sticky');

  assert_percents_equal(animation.currentTime, 50,

      'After aborting a pause when finished, the current time should realign ' +

      'with the scroll position');

}, 'Playing a pause-pending but previously finished animation realigns'

   + ' with the scroll position');

promise_test(async t => {

  const animation = createScrollLinkedAnimation(t);

  animation.play();

  animation.finish();

  await animation.ready;

  animation.play();

  assert_equals(animation.startTime, null);

  await animation.ready;

  assert_percents_equal(animation.startTime, 0, 'start time is zero');

}, 'Playing a finished animation clears the start time');

promise_test(async t => {

  const animation = createScrollLinkedAnimation(t);

  animation.play();

  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 = createScrollLinkedAnimation(t);

  animation.play();

  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 => {

  const animation = createScrollLinkedAnimation(t);

  animation.play();

  animation.currentTime = CSSNumericValue.parse("50%");

  await animation.ready;

  assert_percents_equal(animation.currentTime, 50);

  animation.pause();

  await animation.ready;

  assert_percents_equal(animation.currentTime, 50);

  animation.play();

  await animation.ready;

  assert_percents_equal(animation.startTime, 0);

}, 'Resuming an animation from paused realigns with scroll position.');

promise_test(async t => {

  const animation = createScrollLinkedAnimation(t);

  animation.play();

  await animation.ready;

  // Go to pause-pending state

  animation.pause();

  assert_true(animation.pending, 'Animation is pending');

  const pauseReadyPromise = animation.ready;

  // Now play again immediately (abort the pause)

  animation.play();

  assert_true(animation.pending, 'Animation is still pending');

  assert_equals(animation.ready, pauseReadyPromise,

      'The pause Promise is re-used when playing while waiting to pause');

  // Sanity check: Animation proceeds to running state

  await animation.ready;

  assert_true(!animation.pending && animation.playState === 'running',

      'Animation is running after aborting a pause');

}, 'If a pause operation is interrupted, the ready promise is reused');

promise_test(async t => {

  // Seek animation beyond target end

  const animation = createScrollLinkedAnimation(t);

  animation.play();

  animation.currentTime = CSSNumericValue.parse("-100%");

  await animation.ready;

  assert_percents_equal(animation.currentTime, -100);

  // Set pending playback rate to the opposite direction

  animation.updatePlaybackRate(-1);

  assert_true(animation.pending);

  // Note: Updating the playback rate calls play without rewind. For a

  // scroll-timeline, this will immediately apply the playback rate.

  // TODO: Determine if we should defer applying the new playback rate.

  assert_equals(animation.playbackRate, 1);

  // When we play, we should align to the target end, NOT to zero (which

  // is where we would seek to if we used the playbackRate of 1.

  animation.play();

  await animation.ready;

  assert_percents_equal(animation.startTime, 100);

  assert_percents_equal(animation.currentTime, 100);

}, 'A pending playback rate is used when determining timeline range alignment');

promise_test(async t => {

  const animation = createScrollLinkedAnimation(t);

  animation.play();

  animation.cancel();

  assert_equals(animation.startTime, null,

                'Start time should be unresolved');

  animation.play();

  assert_true(animation.pending, 'Animation should be play-pending');

  await animation.ready;

  assert_false(animation.pending, 'animation should no longer be pending');

  assert_percents_equal(animation.startTime, 0,

      'The start time of the playing animation should be zero');

}, 'Playing a canceled animation sets the start time');

promise_test(async t => {

  const animation = createScrollLinkedAnimation(t);

  animation.play();

  animation.playbackRate = -1;

  animation.cancel();

  assert_equals(animation.startTime, null, 'Start time should be unresolved');

  animation.play();

  assert_true(animation.pending, 'Animation should be play-pending');

  await animation.ready;

  assert_false(animation.pending, 'Animation should no longer be pending');

  assert_percents_equal(animation.startTime, 100,

      'The start time of the playing animation should be set');

}, 'Playing a canceled animation backwards sets the start time');

</script>

</body>