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diff --git a/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-prototype.html b/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-prototype.html
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+++ b/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-prototype.html
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+<!DOCTYPE html>
+<html>
+<head>
+<title>Custom element prototype is the prototype object specified in element definition</title>
+<meta name="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
+<meta name="assert" content="Custom element prototype is the prototype object specified in element definition">
+<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 proto = Object.create(SVGElement.prototype);
+    var GeneratedConstructor = doc.registerElement('x-a', {
+        prototype: proto,
+        extends: 'p'
+    });
+    var customElement = new GeneratedConstructor();
+
+    assert_true(Object.getPrototypeOf(customElement) === proto,
+        'Custom element instance must have the prototype specified in registerElement()');
+}, 'If custom element type is registered with prototype, the custom element ' +
+    'instance should have the prototype specified in registerElement() call');
+</script>
+</body>
+</html>