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+<!doctype html>
+<meta charset=utf-8>
+<title>AnimationEffect.getComputedTiming() for CSS transitions</title>
+<!-- TODO: Add a more specific link for this once it is specified. -->
+<link rel="help" href="https://drafts.csswg.org/css-transitions-2/#csstransition">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="support/helper.js"></script>
+<script src="/web-animations/testcommon.js"></script>
+<style>
+
+.animated-div {
+  margin-left: 100px;
+}
+
+</style>
+<div id="log"></div>
+<script>
+
+'use strict';
+
+
+// --------------------
+// delay
+// --------------------
+
+test(t => {
+  const div = addDiv(t, { class: 'animated-div' });
+  div.style.transition = 'margin-left 10s';
+  getComputedStyle(div).marginLeft;
+  div.style.marginLeft = '10px';
+
+  const effect = div.getAnimations()[0].effect;
+  assert_equals(effect.getComputedTiming().delay, 0, 'Initial value of delay');
+}, 'delay of a new tranisition');
+
+test(t => {
+  const div = addDiv(t, { class: 'animated-div' });
+  div.style.transition = 'margin-left 10s 10s';
+  getComputedStyle(div).marginLeft;
+  div.style.marginLeft = '10px';
+
+  const effect = div.getAnimations()[0].effect;
+  assert_equals(effect.getComputedTiming().delay, 10000,
+                'Initial value of delay');
+}, 'Positive delay of a new transition');
+
+test(t => {
+  const div = addDiv(t, { class: 'animated-div' });
+  div.style.transition = 'margin-left 10s -5s';
+  getComputedStyle(div).marginLeft;
+  div.style.marginLeft = '10px';
+
+  const effect = div.getAnimations()[0].effect;
+  assert_equals(effect.getComputedTiming().delay, -5000,
+                'Initial value of delay');
+}, 'Negative delay of a new transition');
+
+
+// --------------------
+// endDelay
+// --------------------
+
+test(t => {
+  const div = addDiv(t, { class: 'animated-div' });
+  div.style.transition = 'margin-left 10s';
+  getComputedStyle(div).marginLeft;
+  div.style.marginLeft = '10px';
+
+  const effect = div.getAnimations()[0].effect;
+  assert_equals(effect.getComputedTiming().endDelay, 0,
+                'Initial value of endDelay');
+}, 'endDelay of a new transition');
+
+
+// --------------------
+// fill
+// --------------------
+
+test(t => {
+  const div = addDiv(t, { class: 'animated-div' });
+  div.style.transition = 'margin-left 10s';
+  getComputedStyle(div).marginLeft;
+  div.style.marginLeft = '10px';
+
+  const effect = div.getAnimations()[0].effect;
+  assert_equals(effect.getComputedTiming().fill, 'backwards', 'Fill backwards');
+}, 'fill of a new transition');
+
+
+// --------------------
+// iterationStart
+// --------------------
+
+test(t => {
+  const div = addDiv(t, { class: 'animated-div' });
+  div.style.transition = 'margin-left 10s';
+  getComputedStyle(div).marginLeft;
+  div.style.marginLeft = '10px';
+
+  const effect = div.getAnimations()[0].effect;
+  assert_equals(effect.getComputedTiming().iterationStart, 0,
+                'Initial value of iterationStart');
+}, 'iterationStart of a new transition');
+
+
+// --------------------
+// iterations
+// --------------------
+
+test(t => {
+  const div = addDiv(t, { class: 'animated-div' });
+  div.style.transition = 'margin-left 10s';
+  getComputedStyle(div).marginLeft;
+  div.style.marginLeft = '10px';
+
+  const effect = div.getAnimations()[0].effect;
+  assert_equals(effect.getComputedTiming().iterations, 1,
+                'Initial value of iterations');
+}, 'iterations of a new transition');
+
+
+// --------------------
+// duration
+// --------------------
+
+test(t => {
+  const div = addDiv(t, { class: 'animated-div' });
+  div.style.transition = 'margin-left 10s';
+  getComputedStyle(div).marginLeft;
+  div.style.marginLeft = '10px';
+
+  const effect = div.getAnimations()[0].effect;
+  assert_equals(effect.getComputedTiming().duration, 10000,
+                'Initial value of duration');
+}, 'duration of a new transition');
+
+
+// --------------------
+// direction
+// --------------------
+
+test(t => {
+  const div = addDiv(t, { class : 'animated-div' });
+  div.style.transition = 'margin-left 10s';
+  getComputedStyle(div).marginLeft;
+  div.style.marginLeft = '10px';
+
+  const effect = div.getAnimations()[0].effect;
+  assert_equals(effect.getComputedTiming().direction, 'normal',
+                'Initial value of direction');
+}, 'direction of a new transition');
+
+
+// --------------------
+// easing
+// --------------------
+
+test(t => {
+  const div = addDiv(t, { class: 'animated-div' });
+  div.style.transition = 'margin-left 10s';
+  getComputedStyle(div).marginLeft;
+  div.style.marginLeft = '10px';
+
+  const effect = div.getAnimations()[0].effect;
+  assert_equals(effect.getComputedTiming().easing, 'ease',
+                'Initial value of easing');
+}, 'easing of a new transition');
+
+test(t => {
+  const div = addDiv(t, { class: 'animated-div' });
+  div.style.transition = 'margin-left 10s steps(4)';
+  getComputedStyle(div).marginLeft;
+  div.style.marginLeft = '10px';
+
+  const effect = div.getAnimations()[0].effect;
+  assert_equals(effect.getComputedTiming().easing, 'steps(4)',
+                'Initial value of easing');
+}, 'non-default easing of a new transition');
+
+
+// ------------------------------
+// endTime
+// = max(start delay + active duration + end delay, 0)
+// --------------------
+
+test(t => {
+  const div = addDiv(t, { class: 'animated-div' });
+  div.style.transition = 'margin-left 100s -5s';
+  getComputedStyle(div).marginLeft;
+  div.style.marginLeft = '10px';
+
+  const effect = div.getAnimations()[0].effect;
+  const answer = 100000 - 5000; // ms
+  assert_equals(effect.getComputedTiming().endTime, answer,
+                'Initial value of endTime');
+}, 'endTime of a new transition');
+
+
+// --------------------
+// activeDuration
+// = iteration duration * iteration count(==1)
+// --------------------
+
+test(t => {
+  const div = addDiv(t, { class: 'animated-div' });
+  div.style.transition = 'margin-left 100s -5s';
+  getComputedStyle(div).marginLeft;
+  div.style.marginLeft = '10px';
+
+  const effect = div.getAnimations()[0].effect;
+  assert_equals(effect.getComputedTiming().activeDuration, 100000,
+                'Initial value of activeDuration');
+}, 'activeDuration of a new transition');
+
+
+// --------------------
+// localTime
+// --------------------
+
+test(t => {
+  const div = addDiv(t, { class: 'animated-div' });
+  div.style.transition = 'margin-left 100s';
+  getComputedStyle(div).marginLeft;
+  div.style.marginLeft = '10px';
+
+  const effect = div.getAnimations()[0].effect;
+  assert_equals(effect.getComputedTiming().localTime, 0,
+                'Initial value of localTime');
+}, 'localTime of a new transition');
+
+test(t => {
+  const div = addDiv(t, { class: 'animated-div' });
+  div.style.transition = 'margin-left 100s';
+  getComputedStyle(div).marginLeft;
+  div.style.marginLeft = '10px';
+
+  const anim = div.getAnimations()[0];
+  anim.currentTime = 5000;
+  assert_times_equal(anim.effect.getComputedTiming().localTime,
+                     anim.currentTime,
+                     'current localTime after setting currentTime');
+}, 'localTime is always equal to currentTime');
+
+promise_test(async t => {
+  const div = addDiv(t, { class: 'animated-div' });
+  div.style.transition = 'margin-left 100s';
+  getComputedStyle(div).marginLeft;
+  div.style.marginLeft = '10px';
+
+  const anim = div.getAnimations()[0];
+  anim.playbackRate = 2; // 2 times faster
+
+  await anim.ready;
+
+  assert_times_equal(anim.effect.getComputedTiming().localTime,
+                     anim.currentTime,
+                     'localTime is equal to currentTime');
+  await waitForFrame();
+
+  assert_times_equal(anim.effect.getComputedTiming().localTime,
+                     anim.currentTime,
+                     'localTime is equal to currentTime');
+}, 'localTime reflects playbackRate immediately');
+
+
+// --------------------
+// progress
+// --------------------
+
+test(t => {
+  const div = addDiv(t, { class: 'animated-div' });
+  div.style.transition = 'margin-left 10.5s';
+  getComputedStyle(div).marginLeft;
+  div.style.marginLeft = '10px';
+
+  const effect = div.getAnimations()[0].effect;
+  assert_equals(effect.getComputedTiming().progress, 0.0,
+                'Initial value of progress');
+}, 'progress of a new transition');
+
+test(t => {
+  const div = addDiv(t, { class: 'animated-div' });
+  div.style.transition = 'margin-left 10.5s 2s';
+  getComputedStyle(div).marginLeft;
+  div.style.marginLeft = '10px';
+
+  const effect = div.getAnimations()[0].effect;
+  assert_equals(effect.getComputedTiming().progress, 0.0,
+                'Initial value of progress');
+}, 'progress of a new transition with positive delay in before phase');
+
+test(t => {
+  const div = addDiv(t, { class: 'animated-div' });
+  div.style.transition = 'margin-left 10.5s';
+  getComputedStyle(div).marginLeft;
+  div.style.marginLeft = '10px';
+
+  const anim = div.getAnimations()[0];
+  anim.finish();
+  assert_equals(anim.effect.getComputedTiming().progress, null,
+                'finished progress');
+}, 'progress of a finished transition');
+
+
+// --------------------
+// currentIteration
+// --------------------
+
+test(t => {
+  const div = addDiv(t, { class: 'animated-div' });
+  div.style.transition = 'margin-left 10s';
+  getComputedStyle(div).marginLeft;
+  div.style.marginLeft = '10px';
+
+  const effect = div.getAnimations()[0].effect;
+  assert_equals(effect.getComputedTiming().currentIteration, 0,
+                'Initial value of currentIteration');
+}, 'currentIteration of a new transition');
+
+test(t => {
+  const div = addDiv(t, { class: 'animated-div' });
+  div.style.transition = 'margin-left 10s 2s';
+  getComputedStyle(div).marginLeft;
+  div.style.marginLeft = '10px';
+
+  const effect = div.getAnimations()[0].effect;
+  assert_equals(effect.getComputedTiming().currentIteration, 0,
+                'Initial value of currentIteration');
+}, 'currentIteration of a new transition with positive delay in before phase');
+
+test(t => {
+  const div = addDiv(t, { class: 'animated-div' });
+  div.style.transition = 'margin-left 10s';
+  getComputedStyle(div).marginLeft;
+  div.style.marginLeft = '10px';
+
+  const anim = div.getAnimations()[0];
+  anim.finish();
+  assert_equals(anim.effect.getComputedTiming().currentIteration, null,
+                'finished currentIteration');
+}, 'currentIteration of a finished transition');
+
+</script>