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diff --git a/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/created-callback-create-element-ns.html b/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/created-callback-create-element-ns.html
new file mode 100644
index 000000000..7bf09601c
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+++ b/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/created-callback-create-element-ns.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Document.createElementNS() must enqueue created callback for registered custom element type</title>
+<meta name="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
+<meta name="assert" content="Document.createElementNS() must enqueue created callback for registered custom element type">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#extensions-to-document-interface-to-instantiate">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#types-of-callbacks">
+<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 proto = newHTMLElementPrototype();
+    var name = 'x-a';
+
+    doc.registerElement(name, {prototype: proto});
+    var customElement = doc.createElementNS(HTML_NAMESPACE, name);
+    assert_equals(proto.createdCallbackCalledCounter, 1,
+        'Callback created should be enqueued by Document.createElementNS()');
+}, 'Test Document.createElementNS() without typeExtension argument enqueues created callback');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+    var name = 'x-b';
+
+    doc.registerElement(name, {prototype: proto});
+    var customElement = doc.createElementNS(HTML_NAMESPACE, name, name);
+    assert_equals(proto.createdCallbackCalledCounter, 1,
+        'Callback created should be enqueued by Document.createElementNS()');
+}, 'Test Document.createElementNS() with typeExtension argument enqueues created callback');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+    var name = 'x-c';
+    var customElement = doc.createElementNS(HTML_NAMESPACE, name);
+    assert_equals(proto.createdCallbackCalledCounter, 0,
+        'Document.createElementNS() should not enqueue created callback ' +
+        'for unresolved custom element');
+
+    doc.registerElement(name, {prototype: proto});
+    assert_equals(proto.createdCallbackCalledCounter, 1,
+        'Callback created should be called after custom element is registered');
+}, 'Document.createElementNS() should not enqueue created callback ' +
+    'for unresolved custom element');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        var obj = doc.createElement(tagName);
+        var name = 'x-d-' + tagName;
+        var proto = newCustomElementPrototype(Object.create(obj.constructor.prototype));
+        doc.registerElement(name, {prototype: proto, extends: tagName});
+        var customElement = doc.createElementNS(HTML_NAMESPACE, tagName, name);
+
+        assert_equals(proto.createdCallbackCalledCounter, 1,
+            'Callback created should be enqueued by Document.createElementNS()');
+    });
+}, 'Test Document.createElementNS() enqueues created callback for custom elements ' +
+    'that are extensions of HTML5 elements');
+</script>
+</body>
+</html>