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diff --git a/testing/web-platform/tests/web-animations/interfaces/Animation/oncancel.html b/testing/web-platform/tests/web-animations/interfaces/Animation/oncancel.html
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+++ b/testing/web-platform/tests/web-animations/interfaces/Animation/oncancel.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Animation.oncancel</title>
+<link rel="help" href="https://drafts.csswg.org/web-animations/#dom-animation-oncancel">
+<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(t => {
+  const div = createDiv(t);
+  const animation = div.animate({}, 100 * MS_PER_SEC);
+  let finishedTimelineTime;
+  animation.finished.then().catch(() => {
+    finishedTimelineTime = animation.timeline.currentTime;
+  });
+
+  animation.oncancel = t.step_func_done(event => {
+    assert_equals(event.currentTime, null,
+      'event.currentTime should be null');
+    assert_times_equal(event.timelineTime, finishedTimelineTime,
+      'event.timelineTime should equal to the animation timeline ' +
+      'when finished promise is rejected');
+  });
+
+  animation.cancel();
+}, 'oncancel event is fired when animation.cancel() is called.');
+
+</script>
+</body>