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diff --git a/testing/web-platform/tests/dom/nodes/Element-childElementCount-dynamic-add-xhtml.xhtml b/testing/web-platform/tests/dom/nodes/Element-childElementCount-dynamic-add-xhtml.xhtml
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index 0000000000..c97ed1965b
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+++ b/testing/web-platform/tests/dom/nodes/Element-childElementCount-dynamic-add-xhtml.xhtml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+<title>Dynamic Adding of Elements</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<h1>Test of Dynamic Adding of Elements</h1>
+<div id="log"></div>
+<p id="parentEl">The result of this test is
+<span id="first_element_child" style="font-weight:bold;">logged above.</span></p>
+<script><![CDATA[
+test(function() {
+  var parentEl = document.getElementById("parentEl");
+  var newChild = document.createElement("span");
+  parentEl.appendChild(newChild);
+  assert_equals(parentEl.childElementCount, 2)
+})
+]]></script>
+</body>
+</html>