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+<!DOCTYPE html>
+<html>
+<head>
+<title>Invoke CALLBACK with ELEMENT as callback this value</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="Invoke CALLBACK with ELEMENT as callback this value">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#enqueuing-and-invoking-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 GeneratedConstructor = doc.registerElement('x-a', {prototype: proto});
+    var customElement = new GeneratedConstructor();
+
+    doc.body.innerHTML = '<x-a id="x-a"></x-a>';
+    assert_equals(doc.querySelector('#x-a'), proto.createdCallbackThis,
+        '\'this\' value of the created callback should be the custom element');
+}, 'Test \'this\' value inside created callback.');
+
+
+testInIFrame('../../resources/x-element.html', function(doc) {
+    var proto = newHTMLElementPrototype();
+    doc.registerElement('x-element', {prototype: proto});
+
+    assert_equals(doc.querySelector('#x-element'), proto.attachedCallbackThis,
+        '\'this\' value of the attached callback should be the custom element');
+}, 'Test \'this\' value inside attached callback.');
+
+
+testInIFrame('../../resources/x-element.html', function(doc) {
+    var proto = newHTMLElementPrototype();
+    doc.registerElement('x-element', {prototype: proto});
+
+    var customElement = doc.querySelector('#x-element');
+    doc.body.removeChild(customElement);
+    assert_equals(customElement, proto.detachedCallbackThis,
+        '\'this\' value of the detached callback should be the custom element');
+}, 'Test \'this\' value inside detached callback.');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+    var GeneratedConstructor = doc.registerElement('x-b', {prototype: proto});
+    var customElement = new GeneratedConstructor();
+
+    customElement.setAttribute('class', 'someClass');
+    assert_equals(customElement, proto.attributeChangedCallbackThis,
+        '\'this\' value of the attributeChanged callback should be the custom element');
+}, 'Test \'this\' value inside attributeChanged callback.');
+</script>
+</body>
+</html>