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diff --git a/testing/web-platform/tests/custom-elements/v0/custom-element-lifecycle/types-of-callbacks/created-callback-element-prototype-test.html b/testing/web-platform/tests/custom-elements/v0/custom-element-lifecycle/types-of-callbacks/created-callback-element-prototype-test.html
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index 000000000..188957c1a
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+++ b/testing/web-platform/tests/custom-elements/v0/custom-element-lifecycle/types-of-callbacks/created-callback-element-prototype-test.html
@@ -0,0 +1,87 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>The custom element prototype must be set just prior to invoking created callback</title>
+<meta name="author" title="Aleksei Yu. Semenov" href="mailto:a.semenov@unipro.ru">
+<meta name="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
+<meta name="assert" content="The custom element prototype must be set just prior to invoking callback.">
+<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();
+
+    doc.body.innerHTML = '<x-a></x-a>';
+    doc.registerElement('x-a', {prototype: proto});
+    assert_equals(proto.createdCallbackThis.constructor.prototype, proto,
+        'The custom element prototype is incorrect inside created callback');
+}, 'Test custom element prototype inside created callback when custom element is created ' +
+    'in HTML before registration of a custom element');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+
+    doc.registerElement('x-b', {prototype: proto});
+    doc.body.innerHTML = '<x-b></x-b>';
+    assert_equals(proto.createdCallbackThis.constructor.prototype, proto,
+        'The custom element prototype is incorrect inside created callback');
+}, 'Test custom element prototype inside created callback when custom element is created ' +
+    'in HTML after registration of a custom element');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+    var customElement = doc.createElement('x-c');
+
+    doc.body.appendChild(customElement);
+    doc.registerElement('x-c', {prototype: proto});
+    assert_equals(proto.createdCallbackThis.constructor.prototype, proto,
+        'The custom element prototype is incorrect inside created callback');
+}, 'Test custom element prototype inside created callback when custom element is created ' +
+    'via document.createElement() before registration of a custom element');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+    doc.registerElement('x-d', {prototype: proto});
+
+    var customElement = doc.createElement('x-d');
+    doc.body.appendChild(customElement);
+    assert_equals(proto.createdCallbackThis.constructor.prototype, proto,
+        'The custom element prototype is incorrect inside created callback');
+}, 'Test custom element prototype inside created callback when custom element is created ' +
+    'via document.createElement() after registration of a custom element');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+    var GeneratedConstructor = doc.registerElement('x-e', {prototype: proto});
+    var customElement = new GeneratedConstructor();
+
+    assert_equals(proto.createdCallbackThis.constructor.prototype, proto,
+        'The custom element prototype is incorrect inside created callback');
+}, 'Test custom element prototype inside created callback when custom element is created ' +
+    'via constructor returned by method registerElement');
+
+
+testInIFrame('../../resources/x-element.html', function(doc) {
+    var proto = newHTMLElementPrototype();
+    doc.registerElement('x-element', {prototype: proto});
+    assert_equals(proto.createdCallbackThis.constructor.prototype, proto,
+        'The custom element prototype is incorrect inside created callback');
+}, 'Test custom element prototype inside created callback when custom element is created ' +
+    'by UA parser before registration of a custom element');
+</script>
+</body>
+</html>