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diff --git a/testing/web-platform/tests/custom-elements/v0/registering/unresolved-element-pseudoclass/unresolved-element-pseudoclass-matching-query-selector.html b/testing/web-platform/tests/custom-elements/v0/registering/unresolved-element-pseudoclass/unresolved-element-pseudoclass-matching-query-selector.html
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+++ b/testing/web-platform/tests/custom-elements/v0/registering/unresolved-element-pseudoclass/unresolved-element-pseudoclass-matching-query-selector.html
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+<!DOCTYPE html>
+<html>
+<head>
+<title>The :unresolved pseudoclass matching with Document.querySelector()</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="The :unresolved pseudoclass must match all custom elements whose created callback has not yet been invoked">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#unresolved-element-pseudoclass">
+<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();
+    doc.body.innerHTML = '<x-a></x-a>';
+    var customElement = doc.querySelector(':unresolved');
+
+    assert_not_equals(customElement, null,
+        'Unresolved custom element should be accessible by :unresolved');
+    assert_equals(customElement.localName, 'x-a',
+        'Custom element returned by Document.querySelector(\':unresolved\') should be x-a');
+}, 'Test that unresolved custom element is accessible by Document.querySelector(\':unresolved\')');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    doc.body.innerHTML = '<x-b></x-b>';
+    var customElement = doc.querySelector(':unresolved');
+    assert_not_equals(customElement, null,
+        'Unresolved custom element should be accessible by :unresolved');
+    assert_equals(customElement.localName, 'x-b',
+        'Custom element returned by Document.querySelector(\':unresolved\') should be x-b');
+
+    doc.registerElement('x-b');
+    customElement = doc.querySelector(':unresolved');
+    assert_equals(customElement, null,
+        'Registered custom element should not be accessible by :unresolved pseudoclass');
+}, 'Test that registered custom element are not accessible by :unresolved');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    doc.body.innerHTML = '<x-c></x-c><x-d></x-d>';
+    var customElement = doc.querySelector(':unresolved');
+    assert_not_equals(customElement, null,
+        'Unresolved custom element should be accessible by :unresolved pseudoclass');
+    assert_equals(customElement.localName, 'x-c',
+        'Custom element returned by Document.querySelector(\':unresolved\') should be x-c');
+
+    doc.registerElement('x-c');
+    customElement = doc.querySelector(':unresolved');
+    assert_not_equals(customElement, null,
+        'Unresolved custom elements should be accessible by :unresolved pseudoclass');
+    assert_equals(customElement.localName, 'x-d',
+        'Custom element returned by Document.querySelector(\':unresolved\') should be x-d');
+}, 'If there are more than one unresolved custom element, all of them should be ' +
+    'accessible by :unresolved pseudoclass');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var customElement = doc.createElement('x-e');
+    doc.body.appendChild(customElement);
+    var queryResult = doc.querySelector(':unresolved');
+
+    assert_not_equals(queryResult, null,
+        'Unresolved custom element should be accessible by :unresolved');
+    assert_equals(queryResult.localName, 'x-e',
+        'Custom element returned by Document.querySelector(\':unresolved\') should be x-e');
+}, 'Unresolved custom element, created via Document.createElement(), should be ' +
+    'accessible by Document.querySelector(\':unresolved\')');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    doc.body.innerHTML = '<div><x-f></x-f><div>';
+    var customElement = doc.querySelector(':unresolved');
+
+    assert_not_equals(customElement, null,
+        'Unresolved custom element should be accessible by :unresolved');
+    assert_equals(customElement.localName, 'x-f',
+        'Custom element returned by Document.querySelector(\':unresolved\') should be x-f');
+}, 'Unresolved custom element inside div element should be accessible by ' +
+    ':unresolved pseudoclass');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    doc.body.innerHTML = '<x-h><x-g></x-g></x-h>';
+    var customElement = doc.querySelector(':unresolved');
+
+    assert_not_equals(customElement, null,
+        'Unresolved custom element should be accessible by :unresolved pseudoclass');
+    assert_equals(customElement.localName, 'x-h',
+        'Custom element returned by Document.querySelector(\':unresolved\') ' +
+        'should be x-h');
+
+    doc.registerElement('x-h');
+    customElement = doc.querySelector(':unresolved');
+
+    assert_not_equals(customElement, null,
+        'Unresolved custom element should be accessible by :unresolved pseudoclass');
+	assert_equals(customElement.localName, 'x-g',
+        'Custom element returned by Document.querySelector(\':unresolved\') ' +
+        'should be x-g');
+}, 'All unresolved custom element including nested ones should be accessible ' +
+    'by Document.querySelector(\':unresolved\')');
+
+
+testInIFrame('../../resources/x-element.html', function(doc) {
+    var customElement = doc.querySelector(':unresolved');
+
+    assert_not_equals(customElement, null,
+        'Unresolved custom element should be accessible by :unresolved');
+    assert_equals(customElement.localName, 'x-element',
+        'Custom element returned by Document.querySelector(\':unresolved\') should be x-element');
+}, 'Document.querySelector(): Unresolved custom element should be accessible by :unresolved ' +
+    'in loaded document');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        if (HTML5_DOCUMENT_ELEMENTS.indexOf(tagName) === -1) {
+            var obj = doc.createElement(tagName);
+            var name = 'x-i-' + tagName;
+            var id = 'x-i-' + tagName + '-id';
+            if (HTML5_TABLE_ELEMENTS.indexOf(tagName) !== -1) {
+                doc.body.innerHTML =
+                    '<table>' +
+                    '<' + tagName + ' id="' + id + '" is="' + name + '"></' + tagName + '>' +
+                    '</table>';
+            } else {
+                doc.body.innerHTML =
+                    '<' + tagName + ' id="' + id + '" is="' + name + '"></' + tagName + '>';
+            }
+            var customElement = doc.querySelector(':unresolved');
+
+            assert_not_equals(customElement, null,
+                'Unresolved custom element should be accessible by :unresolved pseudoclass');
+            assert_equals(customElement.id, id,
+                'ID of element returned by Document.querySelector(\':unresolved\') ' +
+                'should be ' + id);
+
+            var proto = Object.create(obj.constructor.prototype);
+            doc.registerElement(name, {prototype: proto, extends: tagName});
+            var customElement2 = doc.querySelector(':unresolved');
+
+            assert_equals(customElement2, null,
+                'Registered custom element should not be accessible by :unresolved pseudoclass');
+        }
+    });
+}, 'Test that Document.querySelector(\':unresolved\') returns custom element, ' +
+    'extending HTML elements by IS attribute');
+</script>
+</body>
+</html>