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diff --git a/testing/web-platform/tests/dom/nodes/Node-cloneNode-XMLDocument.html b/testing/web-platform/tests/dom/nodes/Node-cloneNode-XMLDocument.html
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+++ b/testing/web-platform/tests/dom/nodes/Node-cloneNode-XMLDocument.html
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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Cloning of an XMLDocument</title>
+<link rel="help" href="https://dom.spec.whatwg.org/#dom-node-clonenode">
+<link rel="help" href="https://dom.spec.whatwg.org/#concept-node-clone">
+
+<!-- This is testing in particular "that implements the same interfaces as node" -->
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<script>
+"use strict";
+
+test(() => {
+ const doc = document.implementation.createDocument("namespace", "");
+
+ assert_equals(
+ doc.constructor, XMLDocument,
+ "Precondition check: document.implementation.createDocument() creates an XMLDocument"
+ );
+
+ const clone = doc.cloneNode(true);
+
+ assert_equals(clone.constructor, XMLDocument);
+}, "Created with createDocument");
+
+</script>