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diff --git a/testing/web-platform/tests/custom-elements/reactions/ParentNode.html b/testing/web-platform/tests/custom-elements/reactions/ParentNode.html
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index 000000000..b143b5a98
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+++ b/testing/web-platform/tests/custom-elements/reactions/ParentNode.html
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+<!DOCTYPE html>
+<html>
+<head>
+<title>Custom Elements: CEReactions on ParentNode interface</title>
+<meta name="author" title="Ryosuke Niwa" href="mailto:rniwa@webkit.org">
+<meta name="assert" content="prepend and append of ParentNode interface must have CEReactions">
+<meta name="help" content="https://dom.spec.whatwg.org/#parentnode">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../resources/custom-elements-helpers.js"></script>
+<script src="./resources/reactions.js"></script>
+</head>
+<body>
+<div id="log"></div>
+<script>
+
+testNodeConnector(function (newContainer, customElement) {
+    newContainer.prepend(customElement);
+}, 'prepend on ParentNode');
+
+testNodeConnector(function (newContainer, customElement) {
+    newContainer.append(customElement);
+}, 'append on ParentNode');
+
+</script>
+</body>
+</html>