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diff --git a/testing/web-platform/tests/custom-elements/v0/custom-element-lifecycle/types-of-callbacks/attached-callback-test.html b/testing/web-platform/tests/custom-elements/v0/custom-element-lifecycle/types-of-callbacks/attached-callback-test.html
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index 000000000..a4cc0b746
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+++ b/testing/web-platform/tests/custom-elements/v0/custom-element-lifecycle/types-of-callbacks/attached-callback-test.html
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+<!DOCTYPE html>
+<html>
+<head>
+<title>Attached callback of a custom element should be called </title>
+<meta name="timeout" content="long">
+<meta name="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
+<meta name="assert" content="attached callback ... must be enqueued whenever custom element is inserted into a document and this document has a browsing context.">
+<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();
+    assert_equals(proto.attachedCallbackCalledCounter, 0, 'Callback attached ' +
+        'should not be called in documents that do not have a browsing context');
+}, 'Test attached callback if custom element is instantiated via constructor. ' +
+    'Document has no browsing context');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+    doc.registerElement('x-b', {prototype: proto});
+    doc.body.innerHTML = '<x-b></x-b>';
+    assert_equals(proto.attachedCallbackCalledCounter, 0, 'Callback attached ' +
+        'should not be called in documents that do not have a browsing context');
+}, 'Test attached callback if custom element is created via innerHTML property. ' +
+    'Document has no browsing context');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    doc.body.innerHTML = '<x-c></x-c>';
+    var proto = newHTMLElementPrototype();
+    doc.registerElement('x-c', {prototype: proto});
+    assert_equals(proto.attachedCallbackCalledCounter, 0, 'Callback attached ' +
+        'should not be called in documents that do not have a browsing context');
+}, 'Test attached callback if custom element is created via innerHTML property before ' +
+    'registration. Document has no browsing context');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    doc.body.innerHTML = '<x-d id="x-d"></x-d>';
+    var customElement = doc.querySelector('#x-d');
+
+    var proto = newHTMLElementPrototype();
+    var GeneratedConstructor = doc.registerElement('x-d', {prototype: proto});
+
+    customElement.constructor.prototype = proto;
+    assert_equals(proto.attachedCallbackCalledCounter, 0, 'Callback attached should ' +
+        'not be called for unregistered custom element in document without browsing context');
+}, 'Test attached callback if custom element is unregistered');
+
+
+testInIFrame('../../resources/x-element.html', function(doc) {
+    var proto = newHTMLElementPrototype();
+    doc.registerElement('x-element', {prototype: proto});
+    assert_equals(proto.attachedCallbackCalledCounter, 1, 'Callback attached should be ' +
+        'called in documents with browsing context');
+}, 'Test attached callback. Document has browsing context');
+
+
+testInIFrame('../../resources/blank.html', function(doc) {
+    var proto = newHTMLElementPrototype();
+    doc.registerElement('x-element', {prototype: proto});
+
+    var x = doc.createElement('x-element');
+    assert_equals(proto.attachedCallbackCalledCounter, 0, 'Callback attached should not ' +
+        'be called before element is added to document with browsing context');
+
+    doc.body.appendChild(x);
+    assert_equals(proto.attachedCallbackCalledCounter, 1, 'Callback attached should be called ' +
+        'in documents with browsing context');
+}, 'Test attached callback. Registered element is created via document.createElement(). ' +
+    'Document has browsing context');
+
+
+testInIFrame('../../resources/blank.html', function(doc) {
+    var x = doc.createElement('x-element');
+    doc.body.appendChild(x);
+    var proto = newHTMLElementPrototype();
+    doc.registerElement('x-element', {prototype: proto});
+    assert_equals(proto.attachedCallbackCalledCounter, 1, 'Callback attached should ' +
+        'be called in documents with browsing context');
+}, 'Test attached callback. Unregistered element is created via document.createElement(). ' +
+    'Document has browsing context');
+
+
+testInIFrame('../../resources/blank.html', function(doc) {
+    var proto = newHTMLElementPrototype();
+    doc.registerElement('x-element', {prototype: proto});
+    doc.body.innerHTML = '<x-element></x-element>';
+    assert_equals(proto.attachedCallbackCalledCounter, 1, 'Callback attached should ' +
+        'be called in documents with browsing context');
+}, 'Test attached callback. Registered element is created via innerHTML property. ' +
+    'Document has browsing context');
+
+
+testInIFrame('../../resources/blank.html', function(doc) {
+    doc.body.innerHTML = '<x-element></x-element>';
+    var proto = newHTMLElementPrototype();
+    doc.registerElement('x-element', {prototype: proto});
+    assert_equals(proto.attachedCallbackCalledCounter, 1, 'Callback attached should ' +
+        'be called in documents with browsing context');
+}, 'Test attached callback. Unresolved element is created via innerHTML property. ' +
+    'Document has browsing context');
+</script>
+</body>
+</html>