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diff --git a/testing/web-platform/tests/custom-elements/v0/custom-element-lifecycle/types-of-callbacks/attribute-changed-callback-change-attribute-test.html b/testing/web-platform/tests/custom-elements/v0/custom-element-lifecycle/types-of-callbacks/attribute-changed-callback-change-attribute-test.html
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index 000000000..cd5f3a4b8
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+++ b/testing/web-platform/tests/custom-elements/v0/custom-element-lifecycle/types-of-callbacks/attribute-changed-callback-change-attribute-test.html
@@ -0,0 +1,229 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Test attributeChanged callback is called if custom element attribute value is changed</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="attributeChanged callback must be enqueued whenever custom element's attribute is added, changed or removed">
+<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();
+    var GeneratedConstructor = doc.registerElement('x-a', {prototype: proto});
+    var customElement = new GeneratedConstructor();
+
+    customElement.setAttribute('class', 'someClass');
+    proto.attributeChangedCallbackCalledCounter = 0;
+    customElement.setAttribute('class', 'someClass2');
+    assert_equals(proto.attributeChangedCallbackCalledCounter, 1,
+        'Callback attributeChanged should be called');
+}, 'Test attributeChanged callback is called if attribute value is changed by method ' +
+    'setAttribute(). The custom element is created via constructor');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+    doc.registerElement('x-b', {prototype: proto});
+
+    doc.body.innerHTML = '<x-b id="x-b" class="oldValue"></x-b>';
+    var customElement = doc.querySelector('#x-b');
+    customElement.setAttribute('class', 'newValue');
+    assert_equals(proto.attributeChangedCallbackCalledCounter, 1,
+        'Callback attributeChanged should be called');
+    assert_array_equals(proto.attributeChangedCallbackArgs,
+        ['class', 'oldValue', 'newValue'],
+        'Unexpected callback attributeChanged arguments');
+}, 'Test attributeChanged callback arguments if attribute value is changed by method ' +
+    'setAttribute(). The custom element is created via innerHTML property');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+    var GeneratedConstructor = doc.registerElement('x-c', {prototype: proto});
+    var customElement = new GeneratedConstructor();
+
+    customElement.setAttribute('class', 'someClass');
+    proto.attributeChangedCallbackCalledCounter = 0;
+    customElement.classList.add('someClass3');
+    assert_equals(proto.attributeChangedCallbackCalledCounter, 1,
+        'Callback attributeChanged should be called');
+}, 'Test attributeChanged callback is called if attribute value is changed by method ' +
+    'classList.add(). The custom element is created via constructor');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+    doc.registerElement('x-d', {prototype: proto});
+
+    doc.body.innerHTML = '<x-d id="x-d" class="oldValue"></x-d>';
+    var customElement = doc.querySelector('#x-d');
+    customElement.classList.add('newestValue');
+    assert_equals(proto.attributeChangedCallbackCalledCounter, 1,
+        'Callback attributeChanged should be called');
+    assert_array_equals(proto.attributeChangedCallbackArgs,
+        ['class', 'oldValue', 'oldValue newestValue'],
+        'Unexpected callback attributeChanged arguments');
+}, 'Test attributeChanged callback arguments if attribute value is changed by method ' +
+    'classList.add(). The custom element is created via innerHTML property');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+    var GeneratedConstructor = doc.registerElement('x-e', {prototype: proto});
+    var customElement = new GeneratedConstructor();
+
+    customElement.setAttribute('class', 'someClass');
+    proto.attributeChangedCallbackCalledCounter = 0;
+    customElement.id = 'someId';
+    assert_equals(proto.attributeChangedCallbackCalledCounter, 1,
+        'Callback attributeChanged should be called');
+}, 'Test attributeChanged callback is called if attribute value is changed as property. ' +
+    'The custom element is created via constructor');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+    doc.registerElement('x-f', {prototype: proto});
+
+    doc.body.innerHTML = '<x-f id="x-f" class="oldValue"></x-f>';
+    var customElement = doc.querySelector('#x-f');
+    customElement.className = 'lastValue';
+    assert_equals(proto.attributeChangedCallbackCalledCounter, 1,
+        'Callback attributeChanged should be called');
+    assert_array_equals(proto.attributeChangedCallbackArgs,
+        ['class', 'oldValue', 'lastValue'],
+        'Unexpected callback attributeChanged arguments');
+}, 'Test attributeChanged callback arguments if attribute value is changed as property. ' +
+    'The custom element is created via innerHTML property');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+    var GeneratedConstructor = doc.registerElement('x-g', {prototype: proto});
+    var customElement = new GeneratedConstructor();
+
+    customElement.setAttribute('class', 'someClass someSuperClass');
+    proto.attributeChangedCallbackCalledCounter = 0;
+    customElement.classList.toggle('someClass');
+    assert_equals(proto.attributeChangedCallbackCalledCounter, 1,
+        'Callback attributeChanged should be called');
+}, 'Test attributeChanged callback is called if attribute value is changed by classList.toggle(). ' +
+    'The custom element is created via constructor');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+    doc.registerElement('x-h', {prototype: proto});
+
+    doc.body.innerHTML = '<x-h id="x-h" class="oldValue lastValue"></x-h>';
+    var customElement = doc.querySelector('#x-h');
+    customElement.classList.toggle('lastValue');
+    assert_equals(proto.attributeChangedCallbackCalledCounter, 1,
+        'Callback attributeChanged should be called');
+    assert_array_equals(proto.attributeChangedCallbackArgs,
+        ['class', 'oldValue lastValue', 'oldValue'],
+        'Unexpected callback attributeChanged arguments');
+}, 'Test attributeChanged callback arguments if attribute value is changed by classList.toggle(). ' +
+    'The custom element is created via innerHTML property');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    doc.body.innerHTML = '<x-i id="x-i" class="oldValue"></x-i>';
+    var customElement = doc.querySelector('#x-i');
+    customElement.setAttribute('class', 'newValue');
+    customElement.setAttribute('class', 'newestValue');
+
+    var proto = newHTMLElementPrototype();
+    doc.registerElement('x-i', {prototype: proto});
+
+    assert_equals(proto.attributeChangedCallbackCalledCounter, 0,
+        'Callback attributeChanged should not be called');
+
+    customElement.setAttribute('class', 'rightValue');
+    assert_equals(proto.attributeChangedCallbackCalledCounter, 1,
+        'Callback attributeChanged should not be called');
+    assert_array_equals(proto.attributeChangedCallbackArgs,
+        ['class', 'newestValue', 'rightValue'],
+        'Unexpected callback attributeChanged arguments');
+}, 'Test attributeChanged callback is not called if custom element is not registered');
+
+
+testInIFrame('../../resources/x-element.html', function(doc) {
+    var proto = newHTMLElementPrototype();
+    doc.registerElement('x-element', {prototype: proto});
+
+    var customElement = doc.querySelector('#x-element');
+    customElement.setAttribute('class', 'firstValue');
+    customElement.setAttribute('class', 'secondValue');
+    assert_equals(proto.attributeChangedCallbackCalledCounter, 2, 'Callback ' +
+        'attributeChanged should be called after call to setAttribute()');
+
+    customElement.classList.add('someClass3');
+    assert_equals(proto.attributeChangedCallbackCalledCounter, 3, 'Callback ' +
+        'attributeChanged should be called after call to classList.add()');
+
+    customElement.id = 'someId';
+    assert_equals(proto.attributeChangedCallbackCalledCounter, 4, 'Callback ' +
+        'attributeChanged should be called after changing attribute as property');
+}, 'Test attributeChanged callback is called if attribute value is changed. ' +
+    'The document has browsing context');
+
+
+testInIFrame('../../resources/x-element.html', function(doc) {
+    var proto = newHTMLElementPrototype();
+    doc.registerElement('x-element', {prototype: proto});
+    var customElement = doc.querySelector('#x-element');
+
+    customElement.setAttribute('class', 'firstValue');
+    customElement.setAttribute('class', 'secondValue');
+    assert_array_equals(proto.attributeChangedCallbackArgs,
+        ['class', 'firstValue', 'secondValue'],
+        'Unexpected callback attributeChanged arguments after call to setAttribute()');
+
+    customElement.classList.add('newestValue');
+    assert_array_equals(proto.attributeChangedCallbackArgs,
+        ['class', 'secondValue', 'secondValue newestValue'],
+        'Unexpected callback attributeChanged arguments after call to classList.add()');
+
+    customElement.className = 'lastValue';
+    assert_array_equals(proto.attributeChangedCallbackArgs,
+        ['class', 'secondValue newestValue', 'lastValue'],
+        'Unexpected callback attributeChanged arguments after changing attribute as property');
+}, 'Test attributeChanged callback arguments if attribute value is changed. ' +
+    'The document has browsing context');
+
+
+testInIFrame('../../resources/x-element.html', function(doc) {
+    var customElement = doc.querySelector('#x-element');
+    customElement.setAttribute('class', 'firstValue');
+    customElement.setAttribute('class', 'secondValue');
+
+    var proto = newHTMLElementPrototype();
+    doc.registerElement('x-element', {prototype: proto});
+    customElement.setAttribute('class', 'thirdValue');
+
+    assert_equals(proto.attributeChangedCallbackCalledCounter, 1,
+        'Callback attributeChanged should be called');
+    assert_array_equals(proto.attributeChangedCallbackArgs,
+        ['class', 'secondValue', 'thirdValue'],
+        'Unexpected callback attributeChanged arguments after setAttribute() call');
+}, 'Test attributeChanged callback is not called if custom element is not registered. ' +
+    'The document has browsing context');
+</script>
+</body>
+</html>