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+<!doctype html>
+<meta charset=utf-8>
+<title>Pausing a CSSAnimation</title>
+<link rel="help"
+      href="https://drafts.csswg.org/css-animations-2/#animation-play-state">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="support/testcommon.js"></script>
+<style>
+@keyframes anim {
+  0% { margin-left: 0px }
+  100% { margin-left: 10000px }
+}
+</style>
+<div id="log"></div>
+<script>
+'use strict';
+
+promise_test(async t => {
+  const div = addDiv(t);
+  div.style.animation = 'anim 1000s paused';
+
+  const animation = div.getAnimations()[0];
+  animation.play();
+
+  await animation.ready;
+  await waitForNextFrame();
+
+  assert_equals(
+    animation.playState,
+    'running',
+    'Play state is running after calling play()'
+  );
+
+  // Flip the animation-play-state back and forth to check it has no effect
+
+  div.style.animationPlayState = 'running';
+  getComputedStyle(div).animationPlayState;
+  div.style.animationPlayState = 'paused';
+  getComputedStyle(div).animationPlayState;
+
+  assert_equals(
+    animation.playState,
+    'running',
+    'Should still be running even after flipping the animation-play-state'
+  );
+}, 'play() overrides animation-play-state');
+
+promise_test(async t => {
+  const div = addDiv(t);
+  div.style.animation = 'anim 100s infinite paused';
+
+  const animation = div.getAnimations()[0];
+  animation.playbackRate = -1;
+  animation.currentTime = -1;
+
+  assert_throws_dom('InvalidStateError', () => {
+    animation.play();
+  }, 'Trying to play a reversed infinite animation should throw');
+
+  assert_equals(
+    animation.playState,
+    'paused',
+    'Animation should still be paused'
+  );
+
+  animation.playbackRate = 1;
+  div.style.animationPlayState = 'running';
+
+  assert_equals(
+    animation.playState,
+    'running',
+    'Changing the animation-play-state should play the animation'
+  );
+}, 'play() does NOT override the animation-play-state if there was an error');
+
+promise_test(async t => {
+  const div = addDiv(t);
+  div.style.animation = 'anim 1000s paused';
+
+  const animation = div.getAnimations()[0];
+  animation.pause();
+
+  div.style.animationPlayState = 'running';
+  getComputedStyle(div).animationPlayState;
+
+  await animation.ready;
+  await waitForNextFrame();
+
+  assert_equals(animation.playState, 'paused', 'playState is paused ');
+
+  // Flip the animation-play-state back and forth to check it has no effect
+
+  div.style.animationPlayState = 'paused';
+  getComputedStyle(div).animationPlayState;
+  div.style.animationPlayState = 'running';
+  getComputedStyle(div).animationPlayState;
+
+  assert_equals(
+    animation.playState,
+    'paused',
+    'Should still be paused even after flipping the animation-play-state'
+  );
+}, 'pause() overrides animation-play-state');
+
+promise_test(async t => {
+  const div = addDiv(t);
+  div.style.animation = 'anim 100s paused';
+
+  const animation = div.getAnimations()[0];
+  animation.reverse();
+
+  assert_equals(
+    animation.playState,
+    'running',
+    'Play state is running after calling reverse()'
+  );
+
+  // Flip the animation-play-state back and forth to check it has no effect
+
+  div.style.animationPlayState = 'running';
+  getComputedStyle(div).animationPlayState;
+  div.style.animationPlayState = 'paused';
+  getComputedStyle(div).animationPlayState;
+
+  assert_equals(
+    animation.playState,
+    'running',
+    'Should still be running even after flipping the animation-play-state'
+  );
+}, 'reverse() overrides animation-play-state when it starts playing the'
+   + ' animation');
+
+promise_test(async t => {
+  const div = addDiv(t);
+  div.style.animation = 'anim 100s';
+
+  const animation = div.getAnimations()[0];
+  animation.reverse();
+
+  assert_equals(
+    animation.playState,
+    'running',
+    'Play state is running after calling reverse()'
+  );
+
+  div.style.animationPlayState = 'paused';
+  getComputedStyle(div).animationPlayState;
+
+  assert_equals(
+    animation.playState,
+    'paused',
+    'Should be paused after changing the animation-play-state'
+  );
+}, 'reverse() does NOT override animation-play-state if the animation is'
+   + ' already running');
+
+promise_test(async t => {
+  const div = addDiv(t);
+  div.style.animation = 'anim 100s';
+
+  const animation = div.getAnimations()[0];
+  animation.startTime = null;
+
+  assert_equals(
+    animation.playState,
+    'paused',
+    'Play state is paused after setting the start time to null'
+  );
+
+  // Flip the animation-play-state back and forth to check it has no effect
+
+  div.style.animationPlayState = 'paused';
+  getComputedStyle(div).animationPlayState;
+  div.style.animationPlayState = 'running';
+  getComputedStyle(div).animationPlayState;
+
+  assert_equals(
+    animation.playState,
+    'paused',
+    'Should still be paused even after flipping the animation-play-state'
+  );
+}, 'Setting the startTime to null overrides animation-play-state if the'
+   + ' animation is already running');
+
+promise_test(async t => {
+  const div = addDiv(t);
+  div.style.animation = 'anim 100s paused';
+
+  const animation = div.getAnimations()[0];
+  animation.startTime = document.timeline.currentTime;
+
+  assert_equals(
+    animation.playState,
+    'running',
+    'Play state is running after setting the start time to non-null'
+  );
+
+  // Flip the animation-play-state back and forth to check it has no effect
+
+  div.style.animationPlayState = 'running';
+  getComputedStyle(div).animationPlayState;
+  div.style.animationPlayState = 'paused';
+  getComputedStyle(div).animationPlayState;
+
+  assert_equals(
+    animation.playState,
+    'running',
+    'Should still be running even after flipping the animation-play-state'
+  );
+}, 'Setting the startTime to non-null overrides animation-play-state if the'
+   + ' animation is paused');
+
+promise_test(async t => {
+  const div = addDiv(t);
+  div.style.animation = 'anim 100s';
+
+  const animation = div.getAnimations()[0];
+  animation.startTime = document.timeline.currentTime;
+
+  div.style.animationPlayState = 'paused';
+  getComputedStyle(div).animationPlayState;
+
+  assert_equals(
+    animation.playState,
+    'paused',
+    'Should be paused after changing the animation-play-state'
+  );
+}, 'Setting the startTime to non-null does NOT override the'
+   + ' animation-play-state if the animation is already running');
+
+promise_test(async t => {
+  const div = addDiv(t, { style: 'animation: anim 1000s' });
+  const animation = div.getAnimations()[0];
+  let readyPromiseRun = false;
+
+  await animation.ready;
+
+  div.style.animationPlayState = 'paused';
+  assert_true(animation.pending && animation.playState === 'paused',
+              'Animation is pause-pending');
+
+  // Set current time
+  animation.currentTime = 5 * MS_PER_SEC;
+  assert_equals(animation.playState, 'paused',
+                'Animation is paused immediately after setting currentTime');
+  assert_equals(animation.startTime, null,
+                'Animation startTime is unresolved immediately after ' +
+                'setting currentTime');
+  assert_equals(animation.currentTime, 5 * MS_PER_SEC,
+                'Animation currentTime does not change when forcing a ' +
+                'pause operation to complete');
+
+  // The ready promise should now be resolved. If it's not then test will
+  // probably time out before anything else happens that causes it to resolve.
+  await animation.ready;
+}, 'Setting the current time completes a pending pause');
+
+</script>