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diff --git a/testing/web-platform/tests/web-animations/interfaces/KeyframeEffect/copy-contructor.html b/testing/web-platform/tests/web-animations/interfaces/KeyframeEffect/copy-contructor.html
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+++ b/testing/web-platform/tests/web-animations/interfaces/KeyframeEffect/copy-contructor.html
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+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>KeyframeEffect copy constructor tests</title>
+<link rel="help"
+href="https://w3c.github.io/web-animations/#dom-keyframeeffect-keyframeeffect-source">
+<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";
+
+test(function(t) {
+  var effect = new KeyframeEffectReadOnly(createDiv(t), null);
+  assert_equals(effect.constructor.name, 'KeyframeEffectReadOnly');
+  assert_equals(effect.timing.constructor.name,
+                'AnimationEffectTimingReadOnly');
+
+  // Make a mutable copy
+  var copiedEffect = new KeyframeEffect(effect);
+  assert_equals(copiedEffect.constructor.name, 'KeyframeEffect');
+  assert_equals(copiedEffect.timing.constructor.name, 'AnimationEffectTiming');
+}, 'Test mutable copy from a KeyframeEffectReadOnly source');
+
+</script>
+</body>