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diff --git a/testing/web-platform/tests/custom-elements/v0/instantiating/changing-is-attribute.html b/testing/web-platform/tests/custom-elements/v0/instantiating/changing-is-attribute.html
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+++ b/testing/web-platform/tests/custom-elements/v0/instantiating/changing-is-attribute.html
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+<!DOCTYPE html>
+<html>
+<head>
+<title>Changing IS attribute of the custom element must not affect this element's custom element type, after element is instantiated</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="After a custom element is instantiated, changing the value of the IS attribute must not affect this element's custom element type">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#instantiating-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();
+    var GeneratedConstructor = doc.registerElement('x-a');
+    var customElement = new GeneratedConstructor();
+    doc.registerElement('x-b');
+    customElement.setAttribute('is', 'x-b');
+    assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+        'Custom element type should be x-a');
+}, 'Test custom element type, after assigning IS attribute value. ' +
+    'Element is created by constructor');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var GeneratedConstructor = doc.registerElement('x-c');
+    doc.registerElement('x-d');
+    doc.body.innerHTML = '<x-c id="x-c"></x-c>';
+    var customElement = doc.querySelector('#x-c');
+    customElement.setAttribute('is', 'x-d');
+    assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+        'Custom element type should be x-c');
+}, 'Test custom element type, after assigning IS attribute value. ' +
+    'Element is created via innerHTML property');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    doc.body.innerHTML = '<x-e id="x-e"></x-e>';
+    var customElement = doc.querySelector('#x-e');
+    customElement.setAttribute('is', 'x-f');
+    var GeneratedConstructor = doc.registerElement('x-e');
+    doc.registerElement('x-f');
+    assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+        'Custom element type should be x-e');
+}, 'Test custom element type, after assigning IS attribute value to unresolved element. ' +
+    'Element is created via innerHTML property');
+
+
+testInIFrame('../resources/x-element.html', function(doc) {
+    var GeneratedConstructor = doc.registerElement('x-element');
+    doc.registerElement('y-element');
+    var customElement = doc.querySelector('#x-element');
+    customElement.setAttribute('is', 'y-element');
+    assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+        'Custom element type should be x-element');
+}, 'Test custom element type, after assigning IS attribute value. ' +
+    'Element is defined in loaded HTML document');
+
+
+testInIFrame('../resources/x-element.html', function(doc) {
+    var customElement = doc.querySelector('#x-element');
+    customElement.setAttribute('is', 'y-element');
+    var GeneratedConstructor = doc.registerElement('x-element');
+    doc.registerElement('y-element');
+    assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+        'Custom element type should be x-element');
+}, 'Test custom element type, after assigning IS attribute value to unresolved element. ' +
+    'Element is defined in loaded HTML document');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        if (HTML5_DOCUMENT_ELEMENTS.indexOf(tagName) !== -1) {
+            return;
+        }
+        var name = 'y-' + tagName;
+        var obj = doc.createElement(tagName);
+        var proto = Object.create(obj.constructor.prototype);
+        var GeneratedConstructor = doc.registerElement(name, {prototype: proto, extends: tagName});
+        if (HTML5_TABLE_ELEMENTS.indexOf(tagName) !== -1) {
+            doc.body.innerHTML =
+                '<table>' +
+                '<' + tagName + ' id="custom-element" is="' + name + '"></' + tagName + '>' +
+                '</table>';
+        } else {
+            doc.body.innerHTML =
+                '<' + tagName + ' id="custom-element" is="' + name + '"></' + tagName + '>';
+        }
+        var customElement = doc.querySelector('#custom-element');
+        assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+            'Custom element type should be '+ name);
+
+        var name2 = 'y-a-' + tagName;
+        doc.registerElement(name2);
+        customElement.setAttribute('is', name2);
+        assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+            'Custom element type should be ' + name);
+    });
+}, 'Test custom element type after changing IS attribute value. ' +
+    'Element is HTML5 element with IS attribute referring to custom element type');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var localName = 'z-a';
+    var obj = doc.createElement('a');
+    var proto = Object.create(obj.constructor.prototype);
+    var GeneratedConstructor = doc.registerElement(localName, {prototype: proto, extends: 'a'});
+    doc.body.innerHTML = '<a id="custom-element" is="' + localName + '"></a>';
+    var customElement = doc.querySelector('#custom-element');
+
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        var name = 'z-a-' + tagName;
+        var htmlElement = doc.createElement(tagName);
+        var htmlElementProto = Object.create(htmlElement.constructor.prototype);
+        doc.registerElement(name, {prototype: htmlElementProto, extends: tagName});
+        customElement.setAttribute('is', name);
+        assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+            'Custom element type should be ' + localName);
+    });
+}, 'Test custom element type after changing IS attribute value several times. ' +
+    'Element is HTML5 element with IS attribute referring to custom element type');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var GeneratedConstructor = doc.registerElement('x-g');
+    doc.registerElement('x-h');
+    doc.body.innerHTML = '<x-g id="x-g" is="x-h"></x-g>';
+    var customElement = doc.querySelector('#x-g');
+    customElement.removeAttribute('is');
+    assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+        'Custom element type should be x-g');
+}, 'Test custom element type, after removing IS attribute value. ' +
+    'Element is created via innerHTML property');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var obj = doc.createElement('a');
+    var proto = Object.create(obj.constructor.prototype);
+    var GeneratedConstructor = doc.registerElement('x-i', {prototype: proto, extends: 'a'});
+    doc.body.innerHTML = '<a id="x-i" is="x-i"></a>';
+    var customElement = doc.querySelector('#x-i');
+    customElement.removeAttribute('is');
+    assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+        'Custom element type should be x-i');
+}, 'Test custom element type, after removing IS attribute value. ' +
+    'Element is HTML5 element with IS attribute referring to custom element type');
+</script>
+</body>
+</html>