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diff --git a/testing/web-platform/tests/custom-elements/v0/registering/unresolved-elements-interface-html-element.html b/testing/web-platform/tests/custom-elements/v0/registering/unresolved-elements-interface-html-element.html
new file mode 100644
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+++ b/testing/web-platform/tests/custom-elements/v0/registering/unresolved-elements-interface-html-element.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Unresolved element interface must be HTMLElement, if the namespace is HTML Namespace</title>
+<meta name="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
+<meta name="author" title="Aleksei Yu. Semenov" href="mailto:a.semenov@unipro.ru">
+<meta name="assert" content="When an unresolved element is created, it's element interface must be HTMLElement, if the namespace is HTML Namespace">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#registering-custom-elements">
+<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();
+    doc.body.innerHTML = '<x-a id="x-a"></x-a>';
+    var customElement = doc.querySelector('#x-a');
+
+    assert_not_equals(customElement, null, 'Unregistered custom element should not be null');
+
+    assert_class_string(customElement, 'HTMLElement',
+        'Unresolved custom element must be a HTML element');
+}, 'Test interface of unresolved element, created via innerHTML property');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var customElement = doc.createElement('x-b');
+
+    assert_class_string(customElement, 'HTMLElement',
+        'Unresolved custom element must be a HTML element');
+}, 'Test interface of unresolved element, created by Document.createElement');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var customElement = doc.createElementNS(HTML_NAMESPACE, 'x-c');
+
+    assert_class_string(customElement, 'HTMLElement',
+        'Unresolved custom element must be a HTML element');
+}, 'Test interface of unresolved element, created by Document.createElementNS');
+
+
+testInIFrame('../resources/x-element.html', function(doc) {
+    var customElement = doc.getElementById('x-element');
+
+    assert_not_equals(customElement, null, 'Unregistered custom element should not be null');
+
+    assert_class_string(customElement, 'HTMLElement',
+        'Unresolved custom element must be a HTML element');
+}, 'Test unresolved element interface in loaded HTML document');
+</script>
+</body>
+</html>