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diff --git a/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-type-extension-unresolved.html b/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-type-extension-unresolved.html
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index 000000000..3eaadf312
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+++ b/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-type-extension-unresolved.html
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+<!DOCTYPE html>
+<html>
+<head>
+<title>Document.createElement() and Document.createElementNS() create custom element of type, specified by localName argument</title>
+<meta name="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
+<meta name="assert" content="If an element definition with matching localName, namespace, and TYPE is not registered with token's document, set TYPE to localName">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#extensions-to-document-interface-to-instantiate">
+<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();
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        var obj = doc.createElement(tagName);
+        var name = 'x-a-' + tagName;
+        var proto = Object.create(obj.constructor.prototype);
+        var customElement = doc.createElement(tagName, name);
+        assert_equals(Object.getPrototypeOf(customElement), Object.getPrototypeOf(obj),
+            'Unregistered custom element type should be a local name');
+
+        var GeneratedConstructor = doc.registerElement(name, {prototype: proto, extends: tagName});
+        assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+            'Registered custom element type should be the type extension');
+    });
+}, 'If typeExtension is unresolved when createElement called then local name is a type');
+
+
+test (function() {
+    var doc = newHTMLDocument();
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        var obj = doc.createElement(tagName);
+        var name = 'x-b-' + tagName;
+        var proto = Object.create(obj.constructor.prototype);
+        var customElement = doc.createElementNS(HTML_NAMESPACE, tagName, name);
+        assert_equals(Object.getPrototypeOf(customElement), Object.getPrototypeOf(obj),
+            'Custom element type should be a local name');
+
+        var GeneratedConstructor = doc.registerElement(name, {prototype: proto, extends: tagName});
+        assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+            'Custom element type should be the type extension');
+    });
+}, 'If typeExtension is unresolved when createElementNS called then local name is a type');
+</script>
+</body>
+</html>