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diff --git a/testing/web-platform/tests/custom-elements/v0/custom-element-lifecycle/types-of-callbacks/attribute-changed-callback-set-attribute-test.html b/testing/web-platform/tests/custom-elements/v0/custom-element-lifecycle/types-of-callbacks/attribute-changed-callback-set-attribute-test.html
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+++ b/testing/web-platform/tests/custom-elements/v0/custom-element-lifecycle/types-of-callbacks/attribute-changed-callback-set-attribute-test.html
@@ -0,0 +1,338 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Test attributeChanged callback is called if custom element attribute value is set</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');
+    assert_equals(proto.attributeChangedCallbackCalledCounter, 1, 
+        'Callback attributeChanged should be called');
+}, 'Test attributeChanged callback is called if attribute value is set by method ' +
+    'setAttribute(). The custom element is created via constructor.');
+
+
+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_array_equals(proto.attributeChangedCallbackArgs, ['class', null, 'someClass'],
+        'Unexpected callback attributeChanged arguments');
+}, 'Test attributeChanged callback arguments if attribute value is set by method ' +
+    'setAttribute(). The custom element is created via constructor.');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+    var GeneratedConstructor = doc.registerElement('x-c', {prototype: proto});
+
+    var customElement = new GeneratedConstructor();
+    customElement.classList.add('someClass');
+    assert_equals(proto.attributeChangedCallbackCalledCounter, 1, 
+        'Callback attributeChanged should be called');
+}, 'Test attributeChanged callback is called if attribute value is set by method ' +
+    'classList.add(). The custom element is created via constructor.');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+    var GeneratedConstructor = doc.registerElement('x-d', {prototype: proto});
+
+    var customElement = new GeneratedConstructor();
+    customElement.classList.add('someClass');
+    assert_array_equals(proto.attributeChangedCallbackArgs, ['class', null, 'someClass'],
+        'Unexpected callback attributeChanged arguments');
+}, 'Test attributeChanged callback arguments if attribute value is set by method ' +
+    'classList.add(). The custom element is created via constructor.');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+    var GeneratedConstructor = doc.registerElement('x-e', {prototype: proto});
+
+    var customElement = new GeneratedConstructor();
+    customElement.classList.toggle('someClass');
+    assert_equals(proto.attributeChangedCallbackCalledCounter, 1, 
+        'Callback attributeChanged should be called');
+}, 'Test attributeChanged callback is called if attribute value is set by method ' +
+    'classList.toggle(). The custom element is created via constructor.');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+    var GeneratedConstructor = doc.registerElement('x-f', {prototype: proto});
+
+    var customElement = new GeneratedConstructor();
+    customElement.classList.toggle('someClass');
+    assert_array_equals(proto.attributeChangedCallbackArgs, ['class', null, 'someClass'],
+        'Unexpected callback attributeChanged arguments');
+}, 'Test attributeChanged callback arguments if attribute value is set by method ' +
+    'classList.toggle(). The custom element is created via constructor.');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+    var GeneratedConstructor = doc.registerElement('x-g', {prototype: proto});
+
+    var customElement = new GeneratedConstructor();
+    customElement.className = 'someClass';
+    assert_equals(proto.attributeChangedCallbackCalledCounter, 1,
+        'Callback attributeChanged should be called');
+}, 'Test attributeChanged callback is called if attribute value is set as property. ' +
+    'The custom element is created via constructor.');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+    var GeneratedConstructor = doc.registerElement('x-h', {prototype: proto});
+
+    var customElement = new GeneratedConstructor();
+    customElement.className = 'someClass';
+    assert_array_equals(proto.attributeChangedCallbackArgs, ['class', null, 'someClass'],
+        'Unexpected callback attributeChanged arguments');
+}, 'Test attributeChanged callback arguments if attribute value is set as property. '+
+    'The custom element is created via constructor.');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+    doc.registerElement('x-i', {prototype: proto});
+
+    doc.body.innerHTML = '<x-i id="x-i" class="theClass"></x-i>';
+    assert_equals(proto.attributeChangedCallbackCalledCounter, 0, 
+        'Callback attributeChanged should not be called');
+}, 'Test attributeChanged callback is not called if attribute value is specified in HTML. '+
+    'The custom element is created via innerHTML property.');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+    doc.registerElement('x-j', {prototype: proto});
+
+    doc.body.innerHTML = '<x-j id="x-j" class="theClass"></x-j>';
+    var customElement = doc.querySelector('#x-j');
+    customElement.setAttribute('class', 'someClass');
+    assert_equals(proto.attributeChangedCallbackCalledCounter, 1, 
+        'Callback attributeChanged should be called');
+}, 'Test attributeChanged callback is called if attribute value is set by method setAttribute(). '+
+    'The custom element is created via innerHTML property.');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+    doc.registerElement('x-k', {prototype: proto});
+
+    doc.body.innerHTML = '<x-k id="x-k"></x-k>';
+    var customElement = doc.querySelector('#x-k');
+    customElement.setAttribute('class', 'someClass');
+    assert_array_equals(proto.attributeChangedCallbackArgs, ['class', null, 'someClass'],
+        'Unexpected callback attributeChanged arguments');
+}, 'Test attributeChanged callback arguments if attribute value is set by method setAttribute(). '+
+    'The custom element is created via innerHTML property.');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+
+    doc.body.innerHTML = '<x-l id="x-l"></x-l>';
+    var customElement = doc.querySelector('#x-l');
+    // this call shouldn't invoke or enqueue the callback
+    customElement.setAttribute('class', 'someClass');
+
+    var proto = newHTMLElementPrototype();
+    doc.registerElement('x-l', {prototype: proto});
+    assert_equals(proto.attributeChangedCallbackCalledCounter, 0, 
+        'Callback attributeChanged should not be called');
+    // this one should
+    customElement.setAttribute('class', 'someClass2');
+    assert_equals(proto.attributeChangedCallbackCalledCounter, 1, 
+        'Callback attributeChanged should be called');
+}, 'Test attributeChanged callback is not called if attribute value of unresolved element '+
+    'is set by method setAttribute().');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    HTML5_ELEMENTS.forEach(function(element) {
+        var obj = doc.createElement(element);
+        var proto = newCustomElementPrototype(obj.constructor.prototype);
+        var GeneratedConstructor = doc.registerElement('x-' + element + '-' + element + '-1', {
+            prototype: proto,
+            extends: element
+        });
+
+        var customElement = new GeneratedConstructor();
+        customElement.setAttribute('class', 'someClass');
+        assert_equals(proto.attributeChangedCallbackCalledCounter, 1, 
+            'Callback attributeChanged should be called');
+    });
+}, 'Test attributeChanged callback of the custom element that extends some HTML element. ' +
+    'Test that the callback is called');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    HTML5_ELEMENTS.forEach(function(element) {
+        var obj = doc.createElement(element);
+        var proto = newCustomElementPrototype(obj.constructor.prototype);
+        var GeneratedConstructor = doc.registerElement('x-' + element + '-' + element + '-1-1', {
+            prototype: proto,
+            extends: element
+        });
+
+        var customElement = new GeneratedConstructor();
+        customElement.classList.add('someClass');
+        assert_equals(proto.attributeChangedCallbackCalledCounter, 1, 
+            'Callback attributeChanged should be called');
+    });
+}, 'Test attributeChanged callback is called if attribute is set by method classList.add(). '+
+    'The custom element extends some HTML element.');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    HTML5_ELEMENTS.forEach(function(element) {
+        var obj = doc.createElement(element);
+        var proto = newCustomElementPrototype(obj.constructor.prototype);
+        var GeneratedConstructor = doc.registerElement('x-' + element + '-' + element + '-2', {
+            prototype: proto,
+            extends: element
+        });
+
+        var customElement = new GeneratedConstructor();
+        customElement.setAttribute('class', 'someClass');
+        assert_array_equals(proto.attributeChangedCallbackArgs, ['class', null, 'someClass'],
+            'Unexpected callback attributeChanged arguments');
+    });
+}, 'Test attributeChanged callback arguments if attribute value is set by method setAttribute(). '+
+    'The custom element extends some HTML element.');
+
+
+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', 'someClass');
+    assert_equals(proto.attributeChangedCallbackCalledCounter, 1, 
+        'Callback attributeChanged should be called');
+}, 'Test attributeChanged callback is called if attribute value is set by method setAttribute(). '+
+    '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', 'someClass');
+    assert_array_equals(proto.attributeChangedCallbackArgs, ['class', null, 'someClass'],
+        'Unexpected callback attributeChanged arguments');
+}, 'Test attributeChanged callback arguments if attribute value is set by method setAttribute(). '+
+    '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.classList.add('someClass');
+    assert_equals(proto.attributeChangedCallbackCalledCounter, 1, 
+        'Callback attributeChanged should be called');
+}, 'Test attributeChanged callback is called if attribute value is set by method classList.add(). '+
+    '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.classList.add('someClass');
+    assert_array_equals(proto.attributeChangedCallbackArgs, ['class', null, 'someClass'],
+        'Unexpected callback attributeChanged arguments');
+}, 'Test attributeChanged callback arguments if attribute value is set by method classList.add(). '+
+    'The document has browsing context.');
+
+
+testInIFrame('../../resources/x-element.html', function(doc) {
+    var customElement = doc.querySelector('#x-element');
+    // this call shouldn't invoke or enqueue the callback
+    customElement.setAttribute('name', 'someName');
+
+    var proto = newHTMLElementPrototype();
+    doc.registerElement('x-element', {prototype: proto});
+    assert_equals(proto.attributeChangedCallbackCalledCounter, 0, 
+        'Callback attributeChanged should not be called');
+    // this one should
+    customElement.setAttribute('class', 'someClass');
+    assert_equals(proto.attributeChangedCallbackCalledCounter, 1, 
+        'Callback attributeChanged should be called');
+}, 'Test attributeChanged callback is not called if attribute value of unresolved element '+
+    'is set by method setAttribute(). The document has browsing context.');
+
+
+testInIFrame('../../resources/x-element.html', function(doc) {
+    HTML5_ELEMENTS.forEach(function(element) {
+        var obj = doc.createElement(element);
+        var proto = newCustomElementPrototype(obj.constructor.prototype);
+        var GeneratedConstructor = doc.registerElement('x-' + element + '-' + element + '-1', {
+            prototype: proto,
+            extends: element
+        });
+
+        var customElement = new GeneratedConstructor();
+        customElement.setAttribute('class', 'someClass');
+        assert_equals(proto.attributeChangedCallbackCalledCounter, 1, 
+            'Callback attributeChanged should be called');
+    });
+}, 'Test attributeChanged callback is called if attribute value is set by method setAttribute(). '+
+    'The document has browsing context. The custom element extends some HTML element.');
+
+
+testInIFrame('../../resources/x-element.html', function(doc) {
+    HTML5_ELEMENTS.forEach(function(element) {
+        var obj = doc.createElement(element);
+        var proto = newCustomElementPrototype(obj.constructor.prototype);
+        var GeneratedConstructor = doc.registerElement('x-' + element + '-' + element + '-2', {
+            prototype: proto,
+            extends: element
+        });
+
+        var customElement = new GeneratedConstructor();
+        customElement.setAttribute('class', 'someClass');
+        assert_array_equals(proto.attributeChangedCallbackArgs, ['class', null, 'someClass'],
+            'Unexpected callback attributeChanged arguments');
+    });
+}, 'Test attributeChanged callback arguments if attribute value is set by method setAttribute(). '+
+    'The document has browsing context. The custom element extends some HTML element.');
+</script>
+</body>
+</html>