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+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Canceling an animation</title>
+<link rel="help"
+    href="https://drafts.csswg.org/web-animations/#canceling-an-animation-section">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/web-animations/testcommon.js"></script>
+<script src="testcommon.js"></script>
+<style>
+.scroller {
+  overflow: auto;
+  height: 100px;
+  width: 100px;
+  will-change: transform;
+}
+
+.contents {
+  height: 1000px;
+  width: 100%;
+}
+</style>
+<body>
+<script>
+'use strict';
+
+promise_test(async t => {
+  const animation = createScrollLinkedAnimation(t);
+  // Wait for new animation frame which allows the timeline to compute new
+  // current time.
+  await waitForNextFrame();
+  animation.play();
+  animation.cancel();
+
+  assert_equals(animation.startTime, null,
+                'The start time of a canceled animation should be unresolved');
+  assert_equals(animation.currentTime, null,
+                'The hold time of a canceled animation should be unresolved');
+}, 'Canceling an animation should cause its start time and hold time to be'
+   + ' unresolved');
+
+promise_test(async t => {
+  const animation = createScrollLinkedAnimation(t);
+  // Wait for new animation frame which allows the timeline to compute new
+  // current time.
+  await waitForNextFrame();
+  animation.play();
+  const retPromise = animation.ready.then(() => {
+    assert_unreached('ready promise was fulfilled');
+  }).catch(err => {
+    assert_equals(err.name, 'AbortError',
+                  'ready promise is rejected with AbortError');
+  });
+
+  animation.cancel();
+
+  return retPromise;
+}, 'A play-pending ready promise should be rejected when the animation is'
+   + ' canceled');
+
+promise_test(async t => {
+  const animation = createScrollLinkedAnimation(t);
+  // Wait for new animation frame which allows the timeline to compute new
+  // current time.
+  await waitForNextFrame();
+  animation.play();
+  await animation.ready;
+
+  // Make it pause-pending
+  animation.pause();
+
+  // We need to store the original ready promise since cancel() will
+  // replace it
+  const originalPromise = animation.ready;
+  animation.cancel();
+
+  await promise_rejects_dom(t, 'AbortError', originalPromise,
+                            'Cancel should abort ready promise');
+}, 'A pause-pending ready promise should be rejected when the animation is'
+   + ' canceled');
+
+promise_test(async t => {
+  const animation = createScrollLinkedAnimation(t);
+  // Wait for new animation frame which allows the timeline to compute new
+  // current time.
+  await waitForNextFrame();
+  animation.play();
+  animation.cancel();
+  const promiseResult = await animation.ready;
+  assert_equals(promiseResult, animation);
+}, 'When an animation is canceled, it should create a resolved Promise');
+
+promise_test(async t => {
+  const animation = createScrollLinkedAnimation(t);
+  // Wait for new animation frame which allows the timeline to compute new
+  // current time.
+  await waitForNextFrame();
+  animation.play();
+  const promise = animation.ready;
+  animation.cancel();
+  assert_not_equals(animation.ready, promise);
+  promise_rejects_dom(t, 'AbortError', promise,
+                      'Cancel should abort ready promise');
+}, 'The ready promise should be replaced when the animation is canceled');
+
+promise_test(async t => {
+  const animation = createScrollLinkedAnimation(t);
+  // Wait for new animation frame which allows the timeline to compute new
+  // current time.
+  await waitForNextFrame();
+  assert_equals(animation.playState, 'idle',
+                'The animation should be initially idle');
+
+  animation.finished.then(t.step_func(() => {
+    assert_unreached('Finished promise should not resolve');
+  }), t.step_func(() => {
+    assert_unreached('Finished promise should not reject');
+  }));
+
+  animation.cancel();
+
+  return waitForAnimationFrames(3);
+}, 'The finished promise should NOT be rejected if the animation is already'
+   + ' idle');
+
+promise_test(async t => {
+  const animation = createScrollLinkedAnimation(t);
+  // Wait for new animation frame which allows the timeline to compute new
+  // current time.
+  await waitForNextFrame();
+  assert_equals(animation.playState, 'idle',
+                'The animation should be initially idle');
+
+  animation.oncancel = t.step_func(() => {
+    assert_unreached('Cancel event should not be fired');
+  });
+
+  animation.cancel();
+
+  return waitForAnimationFrames(3);
+}, 'The cancel event should NOT be fired if the animation is already idle');
+
+promise_test(async t => {
+  const animation = createScrollLinkedAnimation(t);
+  // Wait for new animation frame which allows the timeline to compute new
+  // current time.
+  await waitForNextFrame();
+  animation.play();
+  animation.effect.target.remove();
+
+  const eventWatcher = new EventWatcher(t, animation, 'cancel');
+
+  await animation.ready;
+  animation.cancel();
+
+  await eventWatcher.wait_for('cancel');
+
+  assert_equals(animation.effect.target.parentNode, null,
+      'cancel event should be fired for the animation on an orphaned element');
+}, 'Canceling an animation should fire cancel event on orphaned element');
+
+promise_test(async t => {
+  const animation = createScrollLinkedAnimation(t);
+  const scroller = animation.timeline.source;
+
+  // Wait for new animation frame which allows the timeline to compute new
+  // current time.
+  await waitForNextFrame();
+  animation.play();
+  await animation.ready;
+
+  // Make the scroll timeline inactive.
+  scroller.style.overflow = 'visible';
+  scroller.scrollTop;
+  await waitForNextFrame();
+  assert_equals(animation.timeline.currentTime, null,
+                'Sanity check the timeline is inactive.');
+  animation.cancel();
+  assert_equals(animation.startTime, null,
+                'The start time of a canceled animation should be unresolved');
+  assert_equals(animation.currentTime, null,
+              'The current time of a canceled animation should be unresolved');
+}, 'Canceling an animation with inactive timeline should cause its start time'
+   + ' and hold time to be unresolved');
+
+promise_test(async t => {
+  const animation = createScrollLinkedAnimation(t);
+  const scroller = animation.timeline.source;
+
+  // Wait for new animation frame which allows the timeline to compute new
+  // current time.
+  await waitForNextFrame();
+  animation.play();
+  await animation.ready;
+
+  // Make the scroll timeline inactive.
+  scroller.style.overflow = 'visible';
+  scroller.scrollTop;
+  await waitForNextFrame();
+  assert_equals(animation.timeline.currentTime, null,
+                'Sanity check the timeline is inactive.');
+
+  const eventWatcher = new EventWatcher(t, animation, 'cancel');
+  animation.cancel();
+  const cancelEvent = await eventWatcher.wait_for('cancel');
+
+  assert_equals(cancelEvent.currentTime, null,
+      'event.currentTime should be unresolved when the timeline is inactive.');
+  assert_equals(cancelEvent.timelineTime, null,
+      'event.timelineTime should be unresolved when the timeline is inactive');
+}, 'oncancel event is fired when the timeline is inactive.');
+
+</script>
+</body>