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diff --git a/testing/web-platform/tests/web-animations/interfaces/AnimationTimeline/idlharness.html b/testing/web-platform/tests/web-animations/interfaces/AnimationTimeline/idlharness.html
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+<!doctype html>
+<meta charset=utf-8>
+<title>Web Animations API: DocumentTimeline tests</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/WebIDLParser.js"></script>
+<script src="/resources/idlharness.js"></script>
+<div id="log"></div>
+<script type="text/plain" id="AnimationTimeline-IDL">
+interface AnimationTimeline {
+  readonly attribute double? currentTime;
+};
+</script>
+<script type="text/plain" id="DocumentTimeline-IDL">
+dictionary DocumentTimelineOptions {
+  DOMHighResTimeStamp originTime = 0;
+};
+[Constructor (optional DocumentTimelineOptions options)]
+interface DocumentTimeline : AnimationTimeline {
+};
+</script>
+<script>
+'use strict';
+
+var idlArray;
+test(function() {
+  idlArray = new IdlArray();
+  idlArray.add_untested_idls(
+    document.getElementById('AnimationTimeline-IDL').textContent);
+  idlArray.add_idls(
+    document.getElementById('DocumentTimeline-IDL').textContent);
+  idlArray.add_objects( { DocumentTimeline: ['document.timeline'] } );
+});
+idlArray.test();
+
+</script>