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+++ b/testing/web-platform/tests/web-animations/interfaces/Animation/onfinish.html
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+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Animation.onfinish</title>
+<link rel="help" href="https://w3c.github.io/web-animations/#dom-animation-onfinish">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../../testcommon.js"></script>
+<body>
+<div id="log"></div>
+<script>
+"use strict";
+
+async_test(function(t) {
+  var div = createDiv(t);
+  var animation = div.animate({}, 100 * MS_PER_SEC);
+  var finishedTimelineTime;
+  animation.finished.then(function() {
+    finishedTimelineTime = animation.timeline.currentTime;
+  });
+
+  animation.onfinish = t.step_func_done(function(event) {
+    assert_equals(event.currentTime, 0,
+      'event.currentTime should be zero');
+    assert_equals(event.timelineTime, finishedTimelineTime,
+      'event.timelineTime should equal to the animation timeline ' +
+      'when finished promise is resolved');
+  });
+
+  animation.playbackRate = -1;
+}, 'onfinish event is fired when the currentTime < 0 and ' +
+   'the playbackRate < 0');
+
+async_test(function(t) {
+  var div = createDiv(t);
+  var animation = div.animate({}, 100 * MS_PER_SEC);
+
+  var finishedTimelineTime;
+  animation.finished.then(function() {
+    finishedTimelineTime = animation.timeline.currentTime;
+  });
+
+  animation.onfinish = t.step_func_done(function(event) {
+    assert_equals(event.currentTime, 100 * MS_PER_SEC,
+      'event.currentTime should be the effect end');
+    assert_equals(event.timelineTime, finishedTimelineTime,
+      'event.timelineTime should equal to the animation timeline ' +
+      'when finished promise is resolved');
+  });
+
+  animation.currentTime = 100 * MS_PER_SEC;
+}, 'onfinish event is fired when the currentTime > 0 and ' +
+   'the playbackRate > 0');
+
+async_test(function(t) {
+  var div = createDiv(t);
+  var animation = div.animate({}, 100 * MS_PER_SEC);
+
+  var finishedTimelineTime;
+  animation.finished.then(function() {
+    finishedTimelineTime = animation.timeline.currentTime;
+  });
+
+  animation.onfinish = t.step_func_done(function(event) {
+    assert_equals(event.currentTime, 100 * MS_PER_SEC,
+      'event.currentTime should be the effect end');
+    assert_equals(event.timelineTime, finishedTimelineTime,
+      'event.timelineTime should equal to the animation timeline ' +
+      'when finished promise is resolved');
+  });
+
+  animation.finish();
+}, 'onfinish event is fired when animation.finish() is called');
+
+promise_test(function(t) {
+  var div = createDiv(t);
+  var animation = div.animate({}, 100 * MS_PER_SEC);
+
+  animation.onfinish = function(event) {
+    assert_unreached('onfinish event should not be fired');
+  };
+
+  animation.currentTime = 100 * MS_PER_SEC / 2;
+  animation.pause();
+
+  return animation.ready.then(function() {
+    animation.currentTime = 100 * MS_PER_SEC;
+    return waitForAnimationFrames(2);
+  });
+}, 'onfinish event is not fired when paused');
+
+promise_test(function(t) {
+  var div = createDiv(t);
+  var animation = div.animate({}, 100 * MS_PER_SEC);
+  animation.onfinish = function(event) {
+    assert_unreached('onfinish event should not be fired');
+  };
+
+  return animation.ready.then(function() {
+    animation.playbackRate = 0;
+    animation.currentTime = 100 * MS_PER_SEC;
+    return waitForAnimationFrames(2);
+  });
+}, 'onfinish event is not fired when the playbackRate is zero');
+
+promise_test(function(t) {
+  var div = createDiv(t);
+  var animation = div.animate({}, 100 * MS_PER_SEC);
+  animation.onfinish = function(event) {
+    assert_unreached('onfinish event should not be fired');
+  };
+
+  return animation.ready.then(function() {
+    animation.currentTime = 100 * MS_PER_SEC;
+    animation.currentTime = 100 * MS_PER_SEC / 2;
+    return waitForAnimationFrames(2);
+  });
+}, 'onfinish event is not fired when the animation falls out ' +
+   'finished state immediately');
+
+</script>
+</body>