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diff --git a/testing/web-platform/tests/custom-elements/v0/registering/unresolved-elements-interface-html-unknown-element.html b/testing/web-platform/tests/custom-elements/v0/registering/unresolved-elements-interface-html-unknown-element.html
new file mode 100644
index 000000000..70c23d3c9
--- /dev/null
+++ b/testing/web-platform/tests/custom-elements/v0/registering/unresolved-elements-interface-html-unknown-element.html
@@ -0,0 +1,53 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Unresolved element interface must be HTMLUnknownElement, if the namespace is neither HTML Namespace nor SVG Namespace</title>
+<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 HTMLUnknownElement, if the namespace is neither HTML Namespace nor SVG 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>
+var MATHML_NAMESPACE = 'http://www.w3.org/1998/Math/MathML';
+
+test(function() {
+    var doc = newHTMLDocument();
+    doc.body.innerHTML =
+        '<math xmlns="' + MATHML_NAMESPACE + '">' +
+            '<x-a id="x-a"></x-a>' +
+        '</math>';
+    var xa = doc.querySelector('#x-a');
+
+    assert_not_equals(xa, null, 'Unregistered custom element should not be null');
+
+    // According https://code.google.com/p/chromium/issues/detail?id=336377
+    // expected class string is Element
+    assert_class_string(xa, 'Element', 'Unresolved custom element must be an Element');
+}, 'Test interface of unresolved element with MathML namespace, created via innerHTML property');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var xa = doc.createElementNS(MATHML_NAMESPACE, 'x-b');
+
+    assert_class_string(xa, 'Element',
+        'Unresolved custom element must be a HTMLUnknownElement');
+}, 'Test interface of unresolved element with MathML namespace, ' +
+    'created by Document.createElementNS');
+
+
+testInIFrame('../resources/x-mathml-element.html', function(doc) {
+    var customElement = doc.getElementById('x-math-element');
+
+    assert_not_equals(customElement, null, 'Unregistered custom element should not be null');
+
+    assert_class_string(customElement, 'Element',
+        'Unresolved custom element must be a Element');
+}, 'Test interface of unresolved element in loaded HTML document with embedded MathML elements');
+</script>
+</body>
+</html>