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diff --git a/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-type-is-attribute.html b/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-type-is-attribute.html
new file mode 100644
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+++ b/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-type-is-attribute.html
@@ -0,0 +1,73 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Instantiation of custom element: custom element type is given as the value of the IS attribute</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="The custom element type is given to a custom element at the time of its instantation in one of the two ways: ... 2. As the value of the IS attribute of the custom element.">
+<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();
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        if (HTML5_DOCUMENT_ELEMENTS.indexOf(tagName) !== -1) {
+            return;
+        }
+        var obj = doc.createElement(tagName);
+        var name = 'x-a-' + 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 the type, specified as value of IS attribute');
+    });
+}, 'Instantiation of custom element: custom element type is given as the value of ' +
+    'the IS attribute');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        if (HTML5_DOCUMENT_ELEMENTS.indexOf(tagName) !== -1) {
+            return;
+        }
+        var obj = doc.createElement(tagName);
+        var name = 'x-b-' + 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 proto = Object.create(obj.constructor.prototype);
+        var GeneratedConstructor = doc.registerElement(name, {prototype: proto, extends: tagName});
+
+        var customElement = doc.querySelector('#custom-element');
+
+        assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+            'Custom element type should be the type, specified as value of IS attribute');
+    });
+}, 'Instantiation of custom element: custom element type is given as the value ' +
+    'of the IS attribute. Custom element is unresolved at first');
+</script>
+</body>
+</html>