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+<!doctype html>
+<meta charset=utf-8>
+<title>Tests for CSS animation event dispatch</title>
+<meta name="timeout" content="long">
+<link rel="help" href="https://drafts.csswg.org/css-animations-2/#event-dispatch"/>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="support/testcommon.js"></script>
+<style>
+@keyframes anim {
+  from { margin-left: 0px; }
+  to { margin-left: 100px; }
+}
+</style>
+<div id="log"></div>
+<script>
+'use strict';
+
+const setupAnimation = (t, animationStyle) => {
+  const div = addDiv(t, { style: 'animation: ' + animationStyle });
+  const animation = div.getAnimations()[0];
+  const timeoutPromise = armTimeoutWhenReady(animation, fastEventsTimeout);
+
+  const watcher = new EventWatcher(t, div, [ 'animationstart',
+                                             'animationiteration',
+                                             'animationend',
+                                             'animationcancel' ],
+                                   timeoutPromise);
+
+  return { animation, watcher, div };
+};
+
+promise_test(async t => {
+  // Add 1ms delay to ensure that the delay is not included in the elapsedTime.
+  const { animation, watcher } = setupAnimation(t, 'anim 100s 1ms');
+
+  const evt = await watcher.wait_for('animationstart');
+  assert_equals(evt.elapsedTime, 0.0);
+}, 'Idle -> Active');
+
+promise_test(async t => {
+  const { animation, watcher } = setupAnimation(t, 'anim 100s');
+
+  // Seek to After phase.
+  animation.finish();
+
+  const events = await watcher.wait_for(['animationstart', 'animationend'], {
+    record: 'all',
+  });
+  assert_equals(events[0].elapsedTime, 0.0);
+  assert_equals(events[1].elapsedTime, 100);
+}, 'Idle -> After');
+
+promise_test(async t => {
+  const { animation, watcher } = setupAnimation(t, 'anim 100s 100s paused');
+
+  await animation.ready;
+
+  // Seek to Active phase.
+  animation.currentTime = 100 * MS_PER_SEC;
+
+  const evt = await watcher.wait_for('animationstart');
+  assert_equals(evt.elapsedTime, 0.0);
+}, 'Before -> Active');
+
+promise_test(async t => {
+  const { animation, watcher } = setupAnimation(t, 'anim 100s 100s paused');
+  const allEvents = watcher.wait_for(['animationstart', 'animationend'], {
+    record: 'all',
+  });
+
+  await animation.ready;
+
+  // Seek to After phase.
+  animation.finish();
+
+  const events = await allEvents;
+  assert_equals(events[0].elapsedTime, 0.0);
+  assert_equals(events[1].elapsedTime, 100.0);
+}, 'Before -> After');
+
+promise_test(async t => {
+  const { animation, watcher, div } = setupAnimation(t, 'anim 100s paused');
+
+  await watcher.wait_for('animationstart');
+
+  // Make idle
+  div.style.display = 'none';
+
+  const evt = await watcher.wait_for('animationcancel');
+  assert_equals(evt.elapsedTime, 0.0);
+}, 'Active -> Idle, display: none');
+
+promise_test(async t => {
+  const { animation, watcher, div } = setupAnimation(t, 'anim 100s paused');
+
+  // Seek to After phase.
+  animation.finish();
+  await watcher.wait_for(['animationstart', 'animationend']);
+
+  div.style.display = 'none';
+
+  // Wait a couple of frames and check that no event was dispatched.
+  await waitForAnimationFrames(2);
+}, 'After -> Idle, display: none');
+
+promise_test(async t => {
+  const { animation, watcher } = setupAnimation(t, 'anim 100s');
+
+  await watcher.wait_for('animationstart');
+
+  animation.currentTime = 100.0;
+
+  // Make idle
+  animation.timeline = null;
+
+  const evt = await watcher.wait_for('animationcancel');
+  assert_time_equals_literal(evt.elapsedTime, 0.1);
+}, 'Active -> Idle, setting Animation.timeline = null');
+
+promise_test(async t => {
+  // We should NOT pause animation since calling cancel synchronously.
+  const { animation, watcher } = setupAnimation(t, 'anim 100s');
+
+  await watcher.wait_for('animationstart');
+
+  animation.currentTime = 50.0;
+  animation.cancel();
+
+  const evt = await watcher.wait_for('animationcancel');
+  assert_time_equals_literal(evt.elapsedTime, 0.05);
+}, 'Active -> Idle, calling Animation.cancel()');
+
+promise_test(async t => {
+  const { animation, watcher } = setupAnimation(t, 'anim 100s 100s paused');
+
+  // Seek to Active phase.
+  animation.currentTime = 100 * MS_PER_SEC;
+  await watcher.wait_for('animationstart');
+
+  // Seek to Before phase.
+  animation.currentTime = 0;
+
+  const evt = await watcher.wait_for('animationend');
+  assert_equals(evt.elapsedTime, 0.0);
+}, 'Active -> Before');
+
+promise_test(async t => {
+  const { animation, watcher } = setupAnimation(t, 'anim 100s paused');
+
+  await watcher.wait_for('animationstart');
+
+  // Seek to After phase.
+  animation.finish();
+
+  const evt = await watcher.wait_for('animationend');
+  assert_equals(evt.elapsedTime, 100.0);
+}, 'Active -> After');
+
+promise_test(async t => {
+  const { animation, watcher } = setupAnimation(t, 'anim 100s 100s paused');
+
+  // Seek to After phase.
+  animation.finish();
+  await watcher.wait_for([ 'animationstart', 'animationend' ]);
+
+  // Seek to Before phase.
+  animation.currentTime = 0;
+
+  const events = await watcher.wait_for(['animationstart', 'animationend'], {
+    record: 'all',
+  });
+  assert_equals(events[0].elapsedTime, 100.0);
+  assert_equals(events[1].elapsedTime, 0.0);
+}, 'After -> Before');
+
+promise_test(async t => {
+  const { animation, watcher } = setupAnimation(t, 'anim 100s 100s paused');
+
+  // Seek to After phase.
+  animation.finish();
+  await watcher.wait_for([ 'animationstart', 'animationend' ]);
+
+  // Seek to Active phase.
+  animation.currentTime = 100 * MS_PER_SEC;
+
+  const evt = await watcher.wait_for('animationstart');
+  assert_equals(evt.elapsedTime, 100.0);
+}, 'After -> Active');
+
+promise_test(async t => {
+  const { animation, watcher } = setupAnimation(t, 'anim 100s 100s 3 paused');
+
+  await animation.ready;
+
+  // Seek to iteration 0 (no animationiteration event should be dispatched)
+  animation.currentTime = 100 * MS_PER_SEC;
+  await watcher.wait_for('animationstart');
+
+  // Seek to iteration 2
+  animation.currentTime = 300 * MS_PER_SEC;
+  let evt = await watcher.wait_for('animationiteration');
+  assert_equals(evt.elapsedTime, 200);
+
+  // Seek to After phase (no animationiteration event should be dispatched)
+  animation.currentTime = 400 * MS_PER_SEC;
+  evt = await watcher.wait_for('animationend');
+  assert_equals(evt.elapsedTime, 300);
+}, 'Active -> Active (forwards)');
+
+promise_test(async t => {
+  const { animation, watcher } = setupAnimation(t, 'anim 100s 100s 3');
+
+  // Seek to After phase.
+  animation.finish();
+  await watcher.wait_for([ 'animationstart', 'animationend' ]);
+
+  // Seek to iteration 2 (no animationiteration event should be dispatched)
+  animation.pause();
+  animation.currentTime = 300 * MS_PER_SEC;
+  await watcher.wait_for('animationstart');
+
+  // Seek to mid of iteration 0 phase.
+  animation.currentTime = 200 * MS_PER_SEC;
+
+  const evt = await watcher.wait_for('animationiteration');
+  assert_equals(evt.elapsedTime, 200.0);
+
+  // Seek to before phase (no animationiteration event should be dispatched)
+  animation.currentTime = 0;
+  await watcher.wait_for('animationend');
+}, 'Active -> Active (backwards)');
+
+promise_test(async t => {
+  const { animation, watcher, div } = setupAnimation(t, 'anim 100s paused');
+
+  await watcher.wait_for('animationstart');
+
+  // Seek to Idle phase.
+  div.style.display = 'none';
+  flushComputedStyle(div);
+
+  await watcher.wait_for('animationcancel');
+
+  // Restart this animation.
+  div.style.display = '';
+  await watcher.wait_for('animationstart');
+}, 'Active -> Idle -> Active: animationstart is fired by restarting animation');
+
+promise_test(async t => {
+  const { animation, watcher } = setupAnimation(t, 'anim 100s 100s 2 paused');
+
+  // Make After.
+  animation.finish();
+
+  await watcher.wait_for([ 'animationstart', 'animationend' ]);
+  animation.playbackRate = -1;
+
+  let evt = await watcher.wait_for('animationstart');
+  assert_equals(evt.elapsedTime, 200);
+
+  // Seek to 1st iteration
+  animation.currentTime = 200 * MS_PER_SEC - 1;
+
+  evt = await watcher.wait_for('animationiteration');
+  assert_equals(evt.elapsedTime, 100);
+
+  // Seek to before
+  animation.currentTime = 100 * MS_PER_SEC - 1;
+
+  evt = await watcher.wait_for('animationend');
+  assert_equals(evt.elapsedTime, 0);
+  assert_equals(animation.playState, 'running'); // delay
+}, 'Negative playbackRate sanity test(Before -> Active -> Before)');
+
+promise_test(async t => {
+  const { animation, watcher } = setupAnimation(t, 'anim 100s 100s');
+
+  animation.currentTime = 150 * MS_PER_SEC;
+  animation.currentTime = 50 * MS_PER_SEC;
+
+  // Then wait a couple of frames and check that no event was dispatched.
+  await waitForAnimationFrames(2);
+}, 'Redundant change, before -> active, then back');
+
+promise_test(async t => {
+  const { animation, watcher } = setupAnimation(t, 'anim 100s 100s');
+
+  animation.currentTime = 250 * MS_PER_SEC;
+  animation.currentTime = 50 * MS_PER_SEC;
+
+  // Then wait a couple of frames and check that no event was dispatched.
+  await waitForAnimationFrames(2);
+}, 'Redundant change, before -> after, then back');
+
+promise_test(async t => {
+  const { animation, watcher } = setupAnimation(t, 'anim 100s 100s');
+
+  // Get us into the initial state:
+  animation.currentTime = 150 * MS_PER_SEC;
+
+  await watcher.wait_for('animationstart');
+
+  animation.currentTime = 50 * MS_PER_SEC;
+  animation.currentTime = 150 * MS_PER_SEC;
+
+  // Then wait a couple of frames and check that no event was dispatched.
+  await waitForAnimationFrames(2);
+}, 'Redundant change, active -> before, then back');
+
+promise_test(async t => {
+  const { animation, watcher } = setupAnimation(t, 'anim 100s 100s');
+
+  // Get us into the initial state:
+  animation.currentTime = 150 * MS_PER_SEC;
+
+  await watcher.wait_for('animationstart');
+
+  animation.currentTime = 250 * MS_PER_SEC;
+  animation.currentTime = 150 * MS_PER_SEC;
+
+  // Then wait a couple of frames and check that no event was dispatched.
+  await waitForAnimationFrames(2);
+}, 'Redundant change, active -> after, then back');
+
+promise_test(async t => {
+  const { animation, watcher } = setupAnimation(t, 'anim 100s 100s');
+
+  // Get us into the initial state:
+  animation.currentTime = 250 * MS_PER_SEC;
+
+  await watcher.wait_for(['animationstart', 'animationend']);
+
+  animation.currentTime = 50 * MS_PER_SEC;
+  animation.currentTime = 250 * MS_PER_SEC;
+
+  // Then wait a couple of frames and check that no event was dispatched.
+  await waitForAnimationFrames(2);
+}, 'Redundant change, after -> before, then back');
+
+promise_test(async t => {
+  const { animation, watcher } = setupAnimation(t, 'anim 100s 100s');
+
+  // Get us into the initial state:
+  animation.currentTime = 250 * MS_PER_SEC;
+
+  await watcher.wait_for(['animationstart', 'animationend']);
+
+  animation.currentTime = 150 * MS_PER_SEC;
+  animation.currentTime = 250 * MS_PER_SEC;
+
+  // Then wait a couple of frames and check that no event was dispatched.
+  await waitForAnimationFrames(2);
+}, 'Redundant change, after -> active, then back');
+
+promise_test(async t => {
+  const { animation, watcher } = setupAnimation(t, 'anim 100s');
+
+  await watcher.wait_for('animationstart');
+
+  // Make idle
+  animation.cancel();
+  await watcher.wait_for('animationcancel');
+
+  animation.cancel();
+  // Then wait a couple of frames and check that no event was dispatched.
+  await waitForAnimationFrames(2);
+}, 'Call Animation.cancel after canceling animation.');
+
+promise_test(async t => {
+  const { animation, watcher } = setupAnimation(t, 'anim 100s');
+
+  await watcher.wait_for('animationstart');
+
+  // Make idle
+  animation.cancel();
+  animation.play();
+  await watcher.wait_for([ 'animationcancel', 'animationstart' ]);
+}, 'Restart animation after canceling animation immediately.');
+
+promise_test(async t => {
+  const { animation, watcher } = setupAnimation(t, 'anim 100s');
+
+  await watcher.wait_for('animationstart');
+
+  // Make idle
+  animation.cancel();
+  animation.play();
+  animation.cancel();
+  await watcher.wait_for('animationcancel');
+
+  // Then wait a couple of frames and check that no event was dispatched.
+  await waitForAnimationFrames(2);
+}, 'Call Animation.cancel after restarting animation immediately.');
+
+promise_test(async t => {
+  const { animation, watcher } = setupAnimation(t, 'anim 100s');
+
+  await watcher.wait_for('animationstart');
+
+  // Make idle
+  animation.timeline = null;
+  await watcher.wait_for('animationcancel');
+
+  animation.timeline = document.timeline;
+  animation.play();
+  await watcher.wait_for('animationstart');
+}, 'Set timeline and play transition after clearing the timeline.');
+
+promise_test(async t => {
+  const { animation, watcher } = setupAnimation(t, 'anim 100s');
+
+  await watcher.wait_for('animationstart');
+
+  // Make idle
+  animation.cancel();
+  await watcher.wait_for('animationcancel');
+
+  animation.effect = null;
+  // Then wait a couple of frames and check that no event was dispatched.
+  await waitForAnimationFrames(2);
+}, 'Set null target effect after canceling the animation.');
+
+promise_test(async t => {
+  const { animation, watcher } = setupAnimation(t, 'anim 100s');
+
+  await watcher.wait_for('animationstart');
+
+  animation.effect = null;
+  await watcher.wait_for('animationend');
+
+  animation.cancel();
+  // Then wait a couple of frames and check that no event was dispatched.
+  await waitForAnimationFrames(2);
+}, 'Cancel the animation after clearing the target effect.');
+
+</script>