File: AnimationEffect-getComputedTiming.tentative.html

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<!doctype html>
<meta charset=utf-8>
<title>AnimationEffect.getComputedTiming() for CSS animations</title>
<!-- TODO: Add a more specific link for this once it is specified. -->
<link rel="help" href="https://drafts.csswg.org/css-animations-2/#cssanimation">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/testcommon.js"></script>
<style>
@keyframes moveAnimation {
  from { margin-left: 100px }
  to { margin-left: 200px }
}
</style>
<body>
<div id="log"></div>
<script>

'use strict';

// --------------------
// delay
// --------------------

test(t => {
  const div = addDiv(t, { style: 'animation: moveAnimation 100s' });
  const effect = div.getAnimations()[0].effect;
  assert_equals(effect.getComputedTiming().delay, 0, 'Initial value of delay');
}, 'delay of a new animation');

test(t => {
  const div = addDiv(t, { style: 'animation: moveAnimation 100s -10s' });
  const effect = div.getAnimations()[0].effect;
  assert_equals(effect.getComputedTiming().delay, -10 * MS_PER_SEC,
                'Initial value of delay');
}, 'Negative delay of a new animation');

test(t => {
  const div = addDiv(t, { style: 'animation: moveAnimation 100s 10s' });
  const effect = div.getAnimations()[0].effect;
  assert_equals(effect.getComputedTiming().delay, 10 * MS_PER_SEC,
                'Initial value of delay');
}, 'Positive delay of a new animation');


// --------------------
// endDelay
// --------------------

test(t => {
  const div = addDiv(t, { style: 'animation: moveAnimation 100s' });
  const effect = div.getAnimations()[0].effect;
  assert_equals(effect.getComputedTiming().endDelay, 0,
                'Initial value of endDelay');
}, 'endDelay of a new animation');


// --------------------
// fill
// --------------------

test(t => {
  const getEffectWithFill = fill => {
    const div = addDiv(t, { style: 'animation: moveAnimation 100s ' + fill });
    return div.getAnimations()[0].effect;
  };

  let effect = getEffectWithFill('');
  assert_equals(effect.getComputedTiming().fill, 'none',
                'Initial value of fill');
  effect = getEffectWithFill('forwards');
  assert_equals(effect.getComputedTiming().fill, 'forwards',
                'Fill forwards');
  effect = getEffectWithFill('backwards');
  assert_equals(effect.getComputedTiming().fill, 'backwards',
                'Fill backwards');
  effect = getEffectWithFill('both');
  assert_equals(effect.getComputedTiming().fill, 'both',
                'Fill forwards and backwards');
}, 'fill of a new animation');


// --------------------
// iterationStart
// --------------------

test(t => {
  const div = addDiv(t, { style: 'animation: moveAnimation 100s' });
  const effect = div.getAnimations()[0].effect;
  assert_equals(effect.getComputedTiming().iterationStart, 0,
                'Initial value of iterationStart');
}, 'iterationStart of a new animation');


// --------------------
// iterations
// --------------------

test(t => {
  const div = addDiv(t, { style: 'animation: moveAnimation 100s' });
  const effect = div.getAnimations()[0].effect;
  assert_equals(effect.getComputedTiming().iterations, 1,
                'Initial value of iterations');
}, 'iterations of a new animation');

test(t => {
  const div = addDiv(t, { style: 'animation: moveAnimation 100s 2016.5' });
  const effect = div.getAnimations()[0].effect;
  assert_equals(effect.getComputedTiming().iterations, 2016.5,
                'Initial value of iterations');
}, 'iterations of a finitely repeating animation');

test(t => {
  const div = addDiv(t, { style: 'animation: moveAnimation 100s infinite' });
  const effect = div.getAnimations()[0].effect;
  assert_equals(effect.getComputedTiming().iterations, Infinity,
                'Initial value of iterations');
}, 'iterations of an infinitely repeating animation');


// --------------------
// duration
// --------------------

test(t => {
  const div = addDiv(t, {
    style: 'animation: moveAnimation 100s -10s infinite'
  });
  const effect = div.getAnimations()[0].effect;
  assert_equals(effect.getComputedTiming().duration, 100 * MS_PER_SEC,
                'Initial value of duration');
}, 'duration of a new animation');


// --------------------
// direction
// --------------------

test(t => {
  const getEffectWithDir = dir => {
    const div = addDiv(t, { style: 'animation: moveAnimation 100s ' + dir });
    return div.getAnimations()[0].effect;
  };

  let effect = getEffectWithDir('');
  assert_equals(effect.getComputedTiming().direction, 'normal',
                'Initial value of normal direction');
  effect = getEffectWithDir('reverse');
  assert_equals(effect.getComputedTiming().direction, 'reverse',
                'Initial value of reverse direction');
  effect = getEffectWithDir('alternate');
  assert_equals(effect.getComputedTiming().direction, 'alternate',
                'Initial value of alternate direction');
  effect = getEffectWithDir('alternate-reverse');
  assert_equals(effect.getComputedTiming().direction, 'alternate-reverse',
                'Initial value of alternate-reverse direction');
}, 'direction of a new animation');


// --------------------
// easing
// --------------------

test(t => {
  const div = addDiv(t, { style: 'animation: moveAnimation 100s' });
  const effect = div.getAnimations()[0].effect;
  assert_equals(effect.getComputedTiming().easing, 'linear',
                'Initial value of easing');
}, 'easing of a new animation');


// ------------------------------
// endTime
// = max(start delay + active duration + end delay, 0)
// --------------------

test(t => {
  const div = addDiv(t, { style: 'animation: moveAnimation 100s' });
  const effect = div.getAnimations()[0].effect;
  assert_equals(effect.getComputedTiming().endTime, 100 * MS_PER_SEC,
                'Initial value of endTime');
}, 'endTime of an new animation');

test(t => {
  const div = addDiv(t, { style: 'animation: moveAnimation 100s -5s' });
  const effect = div.getAnimations()[0].effect;
  const answer = (100 - 5) * MS_PER_SEC;
  assert_equals(effect.getComputedTiming().endTime, answer,
                'Initial value of endTime');
}, 'endTime of an animation with a negative delay');

test(t => {
  const div = addDiv(t, {
    style: 'animation: moveAnimation 10s -100s infinite'
  });
  const effect = div.getAnimations()[0].effect;
  assert_equals(effect.getComputedTiming().endTime, Infinity,
                'Initial value of endTime');
}, 'endTime of an infinitely repeating animation');

test(t => {
  const div = addDiv(t, { style: 'animation: moveAnimation 0s 100s infinite' });
  const effect = div.getAnimations()[0].effect;
  assert_equals(effect.getComputedTiming().endTime, 100 * MS_PER_SEC,
                'Initial value of endTime');
}, 'endTime of an infinitely repeating zero-duration animation');

test(t => {
  // Fill forwards so div.getAnimations()[0] won't return an
  // undefined value.
  const div = addDiv(t, {
    style: 'animation: moveAnimation 10s -100s forwards'
  });
  const effect = div.getAnimations()[0].effect;
  assert_equals(effect.getComputedTiming().endTime, 0,
                'Initial value of endTime');
}, 'endTime of an animation that finishes before its startTime');


// --------------------
// activeDuration
// = iteration duration * iteration count
// --------------------

test(t => {
  const div = addDiv(t, { style: 'animation: moveAnimation 100s 5' });
  const effect = div.getAnimations()[0].effect;
  const answer = 100 * MS_PER_SEC * 5;
  assert_equals(effect.getComputedTiming().activeDuration, answer,
                'Initial value of activeDuration');
}, 'activeDuration of a new animation');

test(t => {
  const div = addDiv(t, { style: 'animation: moveAnimation 100s infinite' });
  const effect = div.getAnimations()[0].effect;
  assert_equals(effect.getComputedTiming().activeDuration, Infinity,
                'Initial value of activeDuration');
}, 'activeDuration of an infinitely repeating animation');

test(t => {
  const div = addDiv(t, { style: 'animation: moveAnimation 0s 1s infinite' });
  const effect = div.getAnimations()[0].effect;
  // If either the iteration duration or iteration count are zero,
  // the active duration is zero.
  assert_equals(effect.getComputedTiming().activeDuration, 0,
                'Initial value of activeDuration');
}, 'activeDuration of an infinitely repeating zero-duration animation');

test(t => {
  const div = addDiv(t, { style: 'animation: moveAnimation 100s 1s 0' });
  const effect = div.getAnimations()[0].effect;
  // If either the iteration duration or iteration count are zero,
  // the active duration is zero.
  assert_equals(effect.getComputedTiming().activeDuration, 0,
                'Initial value of activeDuration');
}, 'activeDuration of an animation with zero iterations');


// --------------------
// localTime
// --------------------

test(t => {
  const div = addDiv(t, { style: 'animation: moveAnimation 100s' });
  const effect = div.getAnimations()[0].effect;
  assert_equals(effect.getComputedTiming().localTime, 0,
                'Initial value of localTime');
}, 'localTime of a new animation');

test(t => {
  const div = addDiv(t, { style: 'animation: moveAnimation 100s' });
  const anim = div.getAnimations()[0];
  anim.currentTime = 5 * MS_PER_SEC;
  assert_equals(anim.effect.getComputedTiming().localTime, anim.currentTime,
                'current localTime after setting currentTime');
}, 'localTime of an animation is always equal to currentTime');

promise_test(async t => {
  const div = addDiv(t, { style: 'animation: moveAnimation 100s' });

  const anim = div.getAnimations()[0];
  anim.playbackRate = 2; // 2 times faster

  await anim.ready;

  assert_equals(anim.effect.getComputedTiming().localTime, anim.currentTime,
                'localTime is equal to currentTime');

  await waitForFrame();

  assert_equals(anim.effect.getComputedTiming().localTime, anim.currentTime,
                'localTime is equal to currentTime');
}, 'localTime reflects playbackRate immediately');

test(t => {
  const div = addDiv(t);
  const effect = new KeyframeEffect(div, {left: ["0px", "100px"]});

  assert_equals(effect.getComputedTiming().localTime, null,
                'localTime for orphaned effect');
}, 'localTime of an AnimationEffect without an Animation');


// --------------------
// progress
//
// Note: Even though CSS animations have a default animation-timing-function of
// "ease", this only applies between keyframes (often referred to as the
// keyframe-level easing). The progress value returned by getComputedTiming(),
// however, only reflects effect-level easing and this defaults to "linear",
// even for CSS animations.
// --------------------

test(t => {
  const tests = [
    { fill: '', progress: [null, null] },
    { fill: 'none', progress: [null, null] },
    { fill: 'forwards', progress: [null, 1.0] },
    { fill: 'backwards', progress: [0.0, null] },
    { fill: 'both', progress: [0.0, 1.0] },
  ];
  for (const test of tests) {
    const div = addDiv(t, {
      style: 'animation: moveAnimation 100s 10s ' + test.fill
    });
    const anim = div.getAnimations()[0];
    assert_true(anim.effect.getComputedTiming().progress === test.progress[0],
                `Initial progress with "${test.fill}" fill`);
    anim.finish();
    assert_true(anim.effect.getComputedTiming().progress === test.progress[1],
                `Initial progress with "${test.fill}" fill`);
  }
}, 'progress of an animation with different fill modes');

test(t => {
  const div = addDiv(t, { style: 'animation: moveAnimation 10s 10 both' });
  const anim = div.getAnimations()[0];

  assert_equals(anim.effect.getComputedTiming().progress, 0.0,
                'Initial value of progress');
  anim.currentTime += 2.5 * MS_PER_SEC;
  assert_equals(anim.effect.getComputedTiming().progress, 0.25,
                'Value of progress');
  anim.currentTime += 5 * MS_PER_SEC;
  assert_equals(anim.effect.getComputedTiming().progress, 0.75,
                'Value of progress');
  anim.currentTime += 5 * MS_PER_SEC;
  assert_equals(anim.effect.getComputedTiming().progress, 0.25,
                'Value of progress');
  anim.finish()
  assert_equals(anim.effect.getComputedTiming().progress, 1.0,
                'Value of progress');
}, 'progress of an integral repeating animation with normal direction');

test(t => {
  // Note: FillMode here is "both" because
  // 1. Since this a zero-duration animation, it will already have finished
  //    so it won't be returned by getAnimations() unless it fills forwards.
  // 2. Fill backwards, so the progress before phase wouldn't be
  //    unresolved (null value).
  const div = addDiv(t, { style: 'animation: moveAnimation 0s infinite both' });
  const anim = div.getAnimations()[0];

  assert_equals(anim.effect.getComputedTiming().progress, 1.0,
                'Initial value of progress in after phase');

  // Seek backwards
  anim.currentTime -= 1 * MS_PER_SEC;
  assert_equals(anim.effect.getComputedTiming().progress, 0.0,
                'Value of progress before phase');
}, 'progress of an infinitely repeating zero-duration animation');

test(t => {
  // Default iterations = 1
  const div = addDiv(t, { style: 'animation: moveAnimation 0s both' });
  const anim = div.getAnimations()[0];

  assert_equals(anim.effect.getComputedTiming().progress, 1.0,
                'Initial value of progress in after phase');

  // Seek backwards
  anim.currentTime -= 1 * MS_PER_SEC;
  assert_equals(anim.effect.getComputedTiming().progress, 0.0,
                'Value of progress before phase');
}, 'progress of a finitely repeating zero-duration animation');

test(t => {
  const div = addDiv(t, { style: 'animation: moveAnimation 0s 5s 10.25 both' });
  const anim = div.getAnimations()[0];

  assert_equals(anim.effect.getComputedTiming().progress, 0.0,
                'Initial value of progress (before phase)');

  // Using iteration duration of 1 now.
  // currentIteration now is floor(10.25) = 10, so progress should be 25%.
  anim.finish();
  assert_equals(anim.effect.getComputedTiming().progress, 0.25,
                'Value of progress in after phase');
}, 'progress of a non-integral repeating zero-duration animation');

test(t => {
  const div = addDiv(t, {
    style: 'animation: moveAnimation 0s 5s 10.25 both reverse',
  });
  const anim = div.getAnimations()[0];

  assert_equals(anim.effect.getComputedTiming().progress, 1.0,
                'Initial value of progress (before phase)');

  // Seek forwards
  anim.finish();
  assert_equals(anim.effect.getComputedTiming().progress, 0.75,
                'Value of progress in after phase');
}, 'Progress of a non-integral repeating zero-duration animation ' +
   'with reversing direction');

test(t => {
  const div = addDiv(t, {
    style: 'animation: moveAnimation 10s 10.25 both alternate',
  });
  const anim = div.getAnimations()[0];

  assert_equals(anim.effect.getComputedTiming().progress, 0.0,
                'Initial value of progress');
  anim.currentTime += 2.5 * MS_PER_SEC;
  assert_equals(anim.effect.getComputedTiming().progress, 0.25,
                'Value of progress');
  anim.currentTime += 5 * MS_PER_SEC;
  assert_equals(anim.effect.getComputedTiming().progress, 0.75,
                'Value of progress');
  anim.currentTime += 5 * MS_PER_SEC;
  assert_equals(anim.effect.getComputedTiming().progress, 0.75,
                'Value of progress');
  anim.finish()
  assert_equals(anim.effect.getComputedTiming().progress, 0.25,
                'Value of progress');
}, 'progress of a non-integral repeating animation ' +
   'with alternate direction');

test(t => {
  const div = addDiv(t, {
    style: 'animation: moveAnimation 10s 10.25 both alternate-reverse',
  });
  const anim = div.getAnimations()[0];

  assert_equals(anim.effect.getComputedTiming().progress, 1.0,
                'Initial value of progress');
  anim.currentTime += 2.5 * MS_PER_SEC;
  assert_equals(anim.effect.getComputedTiming().progress, 0.75,
                'Value of progress');
  anim.currentTime += 5 * MS_PER_SEC;
  assert_equals(anim.effect.getComputedTiming().progress, 0.25,
                'Value of progress');
  anim.currentTime += 5 * MS_PER_SEC;
  assert_equals(anim.effect.getComputedTiming().progress, 0.25,
                'Value of progress');
  anim.finish()
  assert_equals(anim.effect.getComputedTiming().progress, 0.75,
                'Value of progress');
}, 'progress of a non-integral repeating animation ' +
   'with alternate-reversing direction');

test(t => {
  const div = addDiv(t, {
    style: 'animation: moveAnimation 0s 10.25 both alternate',
  });
  const anim = div.getAnimations()[0];

  assert_equals(anim.effect.getComputedTiming().progress, 0.25,
                'Initial value of progress');
  anim.currentTime += 2.5 * MS_PER_SEC;
  assert_equals(anim.effect.getComputedTiming().progress, 0.25,
                'Value of progress');
  anim.currentTime -= 5 * MS_PER_SEC;
  assert_equals(anim.effect.getComputedTiming().progress, 0.0,
                'Value of progress');
  anim.finish()
  assert_equals(anim.effect.getComputedTiming().progress, 0.25,
                'Value of progress');
}, 'progress of a non-integral repeating zero-duration animation ' +
   'with alternate direction');

test(t => {
  const div = addDiv(t, {
    style: 'animation: moveAnimation 0s 10.25 both alternate-reverse',
  });
  const anim = div.getAnimations()[0];

  assert_equals(anim.effect.getComputedTiming().progress, 0.75,
                'Initial value of progress');
  anim.currentTime += 2.5 * MS_PER_SEC;
  assert_equals(anim.effect.getComputedTiming().progress, 0.75,
                'Value of progress');
  anim.currentTime -= 5 * MS_PER_SEC;
  assert_equals(anim.effect.getComputedTiming().progress, 1.0,
                'Value of progress');
  anim.finish()
  assert_equals(anim.effect.getComputedTiming().progress, 0.75,
                'Value of progress');
}, 'progress of a non-integral repeating zero-duration animation ' +
   'with alternate-reverse direction');


// --------------------
// currentIteration
// --------------------

test(t => {
  const div = addDiv(t, { style: 'animation: moveAnimation 100s 2s' });
  const effect = div.getAnimations()[0].effect;
  assert_equals(effect.getComputedTiming().currentIteration, null,
                'Initial value of currentIteration before phase');
}, 'currentIteration of a new animation with no backwards fill is unresolved ' +
   'in before phase');

test(t => {
  const div = addDiv(t, { style: 'animation: moveAnimation 100s' });
  const anim = div.getAnimations()[0];
  assert_equals(anim.effect.getComputedTiming().currentIteration, 0,
                'Initial value of currentIteration');
}, 'currentIteration of a new animation is zero');

test(t => {
  // Note: FillMode here is "both" because
  // 1. Since this a zero-duration animation, it will already have finished
  //    so it won't be returned by getAnimations() unless it fills forwards.
  // 2. Fill backwards, so the currentIteration (before phase) wouldn't be
  //    unresolved (null value).
  const div = addDiv(t, { style: 'animation: moveAnimation 0s infinite both' });
  const anim = div.getAnimations()[0];

  assert_equals(anim.effect.getComputedTiming().currentIteration, Infinity,
                'Initial value of currentIteration in after phase');

  // Seek backwards
  anim.currentTime -= 2 * MS_PER_SEC;
  assert_equals(anim.effect.getComputedTiming().currentIteration, 0,
                'Value of currentIteration count during before phase');
}, 'currentIteration of an infinitely repeating zero-duration animation');

test(t => {
  const div = addDiv(t, { style: 'animation: moveAnimation 0s 10.5 both' });
  const anim = div.getAnimations()[0];

  // Note: currentIteration = ceil(iteration start + iteration count) - 1
  assert_equals(anim.effect.getComputedTiming().currentIteration, 10,
                'Initial value of currentIteration');

  // Seek backwards
  anim.currentTime -= 2 * MS_PER_SEC;
  assert_equals(anim.effect.getComputedTiming().currentIteration, 0,
                'Value of currentIteration count during before phase');
}, 'currentIteration of a finitely repeating zero-duration animation');

test(t => {
  const div = addDiv(t, {
    style: 'animation: moveAnimation 100s 5.5 forwards'
  });
  const anim = div.getAnimations()[0];

  assert_equals(anim.effect.getComputedTiming().currentIteration, 0,
                'Initial value of currentIteration');
  // The 3rd iteration
  // Note: currentIteration = floor(scaled active time / iteration duration)
  anim.currentTime = 250 * MS_PER_SEC;
  assert_equals(anim.effect.getComputedTiming().currentIteration, 2,
                'Value of currentIteration during the 3rd iteration');
  // Finish
  anim.finish();
  assert_equals(anim.effect.getComputedTiming().currentIteration, 5,
                'Value of currentIteration in after phase');
}, 'currentIteration of an animation with a non-integral iteration count');

test(t => {
  const div = addDiv(t, { style: 'animation: moveAnimation 100s 2 forwards' });
  const anim = div.getAnimations()[0];

  assert_equals(anim.effect.getComputedTiming().currentIteration, 0,
                'Initial value of currentIteration');
  // Finish
  anim.finish();
  assert_equals(anim.effect.getComputedTiming().currentIteration, 1,
                'Value of currentIteration in after phase');
}, 'currentIteration of an animation with an integral iteration count');

test(t => {
  const div = addDiv(t, { style: 'animation: moveAnimation 100s forwards' });
  const anim = div.getAnimations()[0];
  assert_equals(anim.effect.getComputedTiming().currentIteration, 0,
                'Initial value of currentIteration');
  // Finish
  anim.finish();
  assert_equals(anim.effect.getComputedTiming().currentIteration, 0,
                'Value of currentIteration in after phase');
}, 'currentIteration of an animation with a default iteration count');

test(t => {
  const div = addDiv(t);
  const effect = new KeyframeEffect(div, {left: ["0px", "100px"]});

  assert_equals(effect.getComputedTiming().currentIteration, null,
                'currentIteration for orphaned effect');
}, 'currentIteration of an AnimationEffect without an Animation');

// TODO: If iteration duration is Infinity, currentIteration is 0.
// However, we cannot set iteration duration to Infinity in CSS Animation now.

</script>
</body>