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diff --git a/testing/web-platform/tests/custom-elements/v0/creating-and-passing-registries/share-registry-create-document.html b/testing/web-platform/tests/custom-elements/v0/creating-and-passing-registries/share-registry-create-document.html
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index 000000000..64244f169
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+++ b/testing/web-platform/tests/custom-elements/v0/creating-and-passing-registries/share-registry-create-document.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Document, created with createHTMLDocument or createDocument with HTML namespace, should share registry with the associated document</title>
+<meta name="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
+<meta name="assert" content="When DOMImplementation's createDocument method is invoked with namespace set to HTML Namespace or when the createHTMLDocument method is invoked, use the registry of the associated document to the new instance.">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#creating-and-passing-registries">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../testcommon.js"></script>
+</head>
+<body>
+<div id="log"></div>
+<script>
+test(function() {
+    var doc = newHTMLDocument();
+    var name = 'x-frame';
+
+    var GeneratedConstructor = doc.registerElement(name);
+    var doc2 = doc.implementation.createHTMLDocument('Document 2');
+    assert_throws(
+        'NotSupportedError',
+        function() { doc2.registerElement(name); },
+        'Registering a custom element type name that is already registered in a shared ' +
+            'registry should throw an exception');
+
+    var xframe = doc2.createElement(name);
+    assert_true(xframe instanceof GeneratedConstructor,
+        'Created element should be x-frame instance');
+}, 'Document created by createHTMLDocument should share an existing registry');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var name = 'x-frame-1';
+
+    var GeneratedConstructor = doc.registerElement(name);
+    var doc2 = doc.implementation.createDocument(HTML_NAMESPACE, 'html', null);
+    assert_throws(
+        'NotSupportedError',
+        function() { doc2.registerElement(name); },
+        'Exception should be thrown for custom element, ' +
+            'which is already registered in shared registry');
+
+    var xframe = doc2.createElement(name);
+    assert_true(xframe instanceof GeneratedConstructor,
+        'Created element should be x-frame instance');
+}, 'Document created by createDocument with HTML namespace should share an existing registry');
+</script>
+</body>
+</html>