the-current-time-of-an-animation.html

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This WPT test may be referenced by the following Test IDs:
- /web-animations/timing-model/animations/the-current-time-of-an-animation.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset=utf-8>

<title>The current time of an animation</title>

<link rel="help" href="https://drafts.csswg.org/web-animations/#the-current-time-of-an-animation">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="../../testcommon.js"></script>

<script src="../../resources/timing-override.js"></script>

<body>

<div id="log"></div>

<script>

'use strict';

test(t => {

  const animation =

    new Animation(new KeyframeEffect(createDiv(t), null, 100 * MS_PER_SEC),

                  document.timeline);

  animation.play();

  assert_equals(animation.currentTime, 0,

    'Current time returns the hold time set when entering the play-pending ' +

    'state');

}, 'The current time returns the hold time when set');

promise_test(async t => {

  const animation =

    new Animation(new KeyframeEffect(createDiv(t), null, 100 * MS_PER_SEC),

                  null);

  await animation.ready;

  assert_equals(animation.currentTime, null);

}, 'The current time is unresolved when there is no associated timeline ' +

   '(and no hold time is set)');

// FIXME: Test that the current time is unresolved when we have an inactive

// timeline if we find a way of creating an inactive timeline!

test(t => {

  const animation =

    new Animation(new KeyframeEffect(createDiv(t), null, 100 * MS_PER_SEC),

                  document.timeline);

  animation.startTime = null;

  assert_equals(animation.currentTime, null);

}, 'The current time is unresolved when the start time is unresolved ' +

   '(and no hold time is set)');

test(t => {

  const animation =

    new Animation(new KeyframeEffect(createDiv(t), null, 100 * MS_PER_SEC),

                  document.timeline);

  animation.playbackRate = 2;

  animation.startTime = document.timeline.currentTime - 25 * MS_PER_SEC;

  const timelineTime = document.timeline.currentTime;

  const startTime = animation.startTime;

  const playbackRate = animation.playbackRate;

  assert_times_equal(animation.currentTime,

                     (timelineTime - startTime) * playbackRate,

                     'Animation has a unresolved start time');

}, 'The current time is calculated from the timeline time, start time and ' +

   'playback rate');

promise_test(async t => {

  const animation = createDiv(t).animate(null, 100 * MS_PER_SEC);

  animation.playbackRate = 0;

  await animation.ready;

  await waitForAnimationFrames(1);

  assert_time_equals_literal(animation.currentTime, 0);

}, 'The current time does not progress if playback rate is 0');

</script>

</body>