From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <mattatobin@localhost.localdomain>
Date: Fri, 2 Feb 2018 04:16:08 -0500
Subject: Add m-esr52 at 52.6.0

---
 .../v0/instantiating/changing-is-attribute.html    | 158 +++++++++++++++++++++
 .../custom-element-constructor-is-attribute.html   |  49 +++++++
 .../custom-element-constructor-local-name.html     |  44 ++++++
 .../custom-element-constructor-namespace.html      |  43 ++++++
 .../custom-element-constructor-node-document.html  | 100 +++++++++++++
 .../custom-element-constructor-prototype.html      |  28 ++++
 .../v0/instantiating/custom-element-prototype.html |  30 ++++
 .../custom-element-type-is-attribute.html          |  73 ++++++++++
 ...m-element-type-local-name-and-is-attribute.html | 101 +++++++++++++
 .../custom-element-type-local-name.html            |  38 +++++
 ...ate-element-interface-type-is-a-local-name.html |  43 ++++++
 ...element-interface-type-is-a-type-extension.html |  69 +++++++++
 .../create-element-is-attribute.html               |  71 +++++++++
 .../create-element-namespace.html                  |  68 +++++++++
 .../create-element-type-extension-is-a-type.html   |  47 ++++++
 .../create-element-type-extension-unresolved.html  |  49 +++++++
 .../create-element-type-is-a-local-name.html       |  38 +++++
 .../created-callback-create-element-ns.html        |  72 ++++++++++
 .../created-callback-create-element.html           |  72 ++++++++++
 .../non-configurable-constructor-property.html     |  41 ++++++
 .../prototype-is-interface-prototype-object.html   |  44 ++++++
 .../v0/instantiating/unchanged-attribute.html      |  29 ++++
 22 files changed, 1307 insertions(+)
 create mode 100644 testing/web-platform/tests/custom-elements/v0/instantiating/changing-is-attribute.html
 create mode 100644 testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-constructor-is-attribute.html
 create mode 100644 testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-constructor-local-name.html
 create mode 100644 testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-constructor-namespace.html
 create mode 100644 testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-constructor-node-document.html
 create mode 100644 testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-constructor-prototype.html
 create mode 100644 testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-prototype.html
 create mode 100644 testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-type-is-attribute.html
 create mode 100644 testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-type-local-name-and-is-attribute.html
 create mode 100644 testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-type-local-name.html
 create mode 100644 testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-interface-type-is-a-local-name.html
 create mode 100644 testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-interface-type-is-a-type-extension.html
 create mode 100644 testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-is-attribute.html
 create mode 100644 testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-namespace.html
 create mode 100644 testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-type-extension-is-a-type.html
 create mode 100644 testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-type-extension-unresolved.html
 create mode 100644 testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-type-is-a-local-name.html
 create mode 100644 testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/created-callback-create-element-ns.html
 create mode 100644 testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/created-callback-create-element.html
 create mode 100644 testing/web-platform/tests/custom-elements/v0/instantiating/non-configurable-constructor-property.html
 create mode 100644 testing/web-platform/tests/custom-elements/v0/instantiating/prototype-is-interface-prototype-object.html
 create mode 100644 testing/web-platform/tests/custom-elements/v0/instantiating/unchanged-attribute.html

(limited to 'testing/web-platform/tests/custom-elements/v0/instantiating')

diff --git a/testing/web-platform/tests/custom-elements/v0/instantiating/changing-is-attribute.html b/testing/web-platform/tests/custom-elements/v0/instantiating/changing-is-attribute.html
new file mode 100644
index 000000000..fb4338840
--- /dev/null
+++ b/testing/web-platform/tests/custom-elements/v0/instantiating/changing-is-attribute.html
@@ -0,0 +1,158 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Changing IS attribute of the custom element must not affect this element's custom element type, after element is instantiated</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="After a custom element is instantiated, changing the value of the IS attribute must not affect this element's custom element type">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#instantiating-custom-elements">
+<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 GeneratedConstructor = doc.registerElement('x-a');
+    var customElement = new GeneratedConstructor();
+    doc.registerElement('x-b');
+    customElement.setAttribute('is', 'x-b');
+    assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+        'Custom element type should be x-a');
+}, 'Test custom element type, after assigning IS attribute value. ' +
+    'Element is created by constructor');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var GeneratedConstructor = doc.registerElement('x-c');
+    doc.registerElement('x-d');
+    doc.body.innerHTML = '<x-c id="x-c"></x-c>';
+    var customElement = doc.querySelector('#x-c');
+    customElement.setAttribute('is', 'x-d');
+    assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+        'Custom element type should be x-c');
+}, 'Test custom element type, after assigning IS attribute value. ' +
+    'Element is created via innerHTML property');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    doc.body.innerHTML = '<x-e id="x-e"></x-e>';
+    var customElement = doc.querySelector('#x-e');
+    customElement.setAttribute('is', 'x-f');
+    var GeneratedConstructor = doc.registerElement('x-e');
+    doc.registerElement('x-f');
+    assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+        'Custom element type should be x-e');
+}, 'Test custom element type, after assigning IS attribute value to unresolved element. ' +
+    'Element is created via innerHTML property');
+
+
+testInIFrame('../resources/x-element.html', function(doc) {
+    var GeneratedConstructor = doc.registerElement('x-element');
+    doc.registerElement('y-element');
+    var customElement = doc.querySelector('#x-element');
+    customElement.setAttribute('is', 'y-element');
+    assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+        'Custom element type should be x-element');
+}, 'Test custom element type, after assigning IS attribute value. ' +
+    'Element is defined in loaded HTML document');
+
+
+testInIFrame('../resources/x-element.html', function(doc) {
+    var customElement = doc.querySelector('#x-element');
+    customElement.setAttribute('is', 'y-element');
+    var GeneratedConstructor = doc.registerElement('x-element');
+    doc.registerElement('y-element');
+    assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+        'Custom element type should be x-element');
+}, 'Test custom element type, after assigning IS attribute value to unresolved element. ' +
+    'Element is defined in loaded HTML document');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        if (HTML5_DOCUMENT_ELEMENTS.indexOf(tagName) !== -1) {
+            return;
+        }
+        var name = 'y-' + tagName;
+        var obj = doc.createElement(tagName);
+        var proto = Object.create(obj.constructor.prototype);
+        var GeneratedConstructor = doc.registerElement(name, {prototype: proto, extends: tagName});
+        if (HTML5_TABLE_ELEMENTS.indexOf(tagName) !== -1) {
+            doc.body.innerHTML =
+                '<table>' +
+                '<' + tagName + ' id="custom-element" is="' + name + '"></' + tagName + '>' +
+                '</table>';
+        } else {
+            doc.body.innerHTML =
+                '<' + tagName + ' id="custom-element" is="' + name + '"></' + tagName + '>';
+        }
+        var customElement = doc.querySelector('#custom-element');
+        assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+            'Custom element type should be '+ name);
+
+        var name2 = 'y-a-' + tagName;
+        doc.registerElement(name2);
+        customElement.setAttribute('is', name2);
+        assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+            'Custom element type should be ' + name);
+    });
+}, 'Test custom element type after changing IS attribute value. ' +
+    'Element is HTML5 element with IS attribute referring to custom element type');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var localName = 'z-a';
+    var obj = doc.createElement('a');
+    var proto = Object.create(obj.constructor.prototype);
+    var GeneratedConstructor = doc.registerElement(localName, {prototype: proto, extends: 'a'});
+    doc.body.innerHTML = '<a id="custom-element" is="' + localName + '"></a>';
+    var customElement = doc.querySelector('#custom-element');
+
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        var name = 'z-a-' + tagName;
+        var htmlElement = doc.createElement(tagName);
+        var htmlElementProto = Object.create(htmlElement.constructor.prototype);
+        doc.registerElement(name, {prototype: htmlElementProto, extends: tagName});
+        customElement.setAttribute('is', name);
+        assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+            'Custom element type should be ' + localName);
+    });
+}, 'Test custom element type after changing IS attribute value several times. ' +
+    'Element is HTML5 element with IS attribute referring to custom element type');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var GeneratedConstructor = doc.registerElement('x-g');
+    doc.registerElement('x-h');
+    doc.body.innerHTML = '<x-g id="x-g" is="x-h"></x-g>';
+    var customElement = doc.querySelector('#x-g');
+    customElement.removeAttribute('is');
+    assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+        'Custom element type should be x-g');
+}, 'Test custom element type, after removing IS attribute value. ' +
+    'Element is created via innerHTML property');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var obj = doc.createElement('a');
+    var proto = Object.create(obj.constructor.prototype);
+    var GeneratedConstructor = doc.registerElement('x-i', {prototype: proto, extends: 'a'});
+    doc.body.innerHTML = '<a id="x-i" is="x-i"></a>';
+    var customElement = doc.querySelector('#x-i');
+    customElement.removeAttribute('is');
+    assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+        'Custom element type should be x-i');
+}, 'Test custom element type, after removing IS attribute value. ' +
+    'Element is HTML5 element with IS attribute referring to custom element type');
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-constructor-is-attribute.html b/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-constructor-is-attribute.html
new file mode 100644
index 000000000..0e18bf651
--- /dev/null
+++ b/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-constructor-is-attribute.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Custom element constructor sets value of IS attribute to custom element type, if it is not equal to name</title>
+<meta name="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
+<meta name="assert" content="If TYPE is not the same as NAME, set the value of ELEMENT's IS attribute to TYPE">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#instantiating-custom-elements">
+<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();
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        if (HTML5_DOCUMENT_ELEMENTS.indexOf(tagName) !== -1) {
+            return;
+        }
+        var obj = doc.createElement(tagName);
+        var name = 'x-a-' + tagName;
+        var proto = Object.create(obj.constructor.prototype);
+        var GeneratedConstructor = doc.registerElement(name, {prototype: proto, extends: tagName});
+        var customElement = new GeneratedConstructor();
+
+        assert_equals(customElement.getAttribute('is'), name,
+            'Value of the IS attribute should be set to type');
+    });
+}, 'Test that the constructor of a type extension sets the IS attribute value to the type');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        if (HTML5_DOCUMENT_ELEMENTS.indexOf(tagName) !== -1) {
+            return;
+        }
+        var name = 'x-b-' + tagName;
+        var GeneratedConstructor = doc.registerElement(name);
+        var customElement = new GeneratedConstructor();
+
+        assert_false(customElement.hasAttribute('is'),
+            'IS attribute should not present if local name is the same as type');
+    });
+}, 'Test that the constructor of a custom element does not set the IS attribute if local name is the same as type');
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-constructor-local-name.html b/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-constructor-local-name.html
new file mode 100644
index 000000000..28f6ca33f
--- /dev/null
+++ b/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-constructor-local-name.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Custom element constructor sets local name to the name from custom element definition</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="Set ELEMENT's local name to NAME">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#instantiating-custom-elements">
+<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 GeneratedConstructor = doc.registerElement('x-a');
+    var customElement = new GeneratedConstructor();
+    assert_equals(customElement.localName, 'x-a',
+        'Custom element local name should be equal to the name in custom element definition');
+}, 'Custom element constructor sets local name to the name from custom element definition');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        var obj = doc.createElement(tagName);
+        var name = 'x-b-' + tagName;
+        var proto = Object.create(obj.constructor.prototype);
+        var GeneratedConstructor = doc.registerElement(name, {
+            prototype: proto,
+            extends: tagName
+        });
+        var customElement = new GeneratedConstructor();
+
+        assert_equals(customElement.localName, tagName,
+            'Custom element local name should be equal to the name in custom element definition');
+    });
+}, 'Custom element constructor sets local name to the name from custom element definition. ' +
+    'Test constructor of extended HTML element');
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-constructor-namespace.html b/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-constructor-namespace.html
new file mode 100644
index 000000000..7278086ac
--- /dev/null
+++ b/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-constructor-namespace.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Custom element constructor sets local namespace to the namespace from custom element definition</title>
+<meta name="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
+<meta name="assert" content="Custom element constructor sets custom element namespace to the namespace in custom element definition">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#instantiating-custom-elements">
+<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 GeneratedConstructor = doc.registerElement('x-a');
+    var customElement = new GeneratedConstructor();
+    assert_equals(customElement.namespaceURI, HTML_NAMESPACE,
+        'Custom element namespace should be equal to namespace in custom element definition');
+}, 'Custom element constructor sets namespace to the namespace from custom element definition');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        var obj = doc.createElement(tagName);
+        var name = 'x-b-' + tagName;
+        var proto = Object.create(obj.constructor.prototype);
+        var GeneratedConstructor = doc.registerElement(name, {
+            prototype: proto,
+            extends: tagName
+        });
+        var customElement = new GeneratedConstructor();
+
+        assert_equals(customElement.namespaceURI, HTML_NAMESPACE,
+            'Custom element namespace should be equal to namespace in custom element definition');
+    });
+}, 'Custom element constructor sets namespace to the namespace from custom element definition. ' +
+    'Test constructor of extended HTML element');
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-constructor-node-document.html b/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-constructor-node-document.html
new file mode 100644
index 000000000..3112b36da
--- /dev/null
+++ b/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-constructor-node-document.html
@@ -0,0 +1,100 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Custom element constructor sets owner document to the document, where custom element type is registered</title>
+<meta name="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
+<meta name="assert" content="Custom element constructor sets custom element node document to the document, where custom element type is registered">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#instantiating-custom-elements">
+<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 GeneratedConstructor = doc.registerElement('x-a');
+    var customElement = new GeneratedConstructor();
+    assert_equals(customElement.ownerDocument, doc,
+        'Custom element owner document should be the document, where custom element ' +
+        'type is registered');
+}, 'Custom element constructor sets owner document to the document, where custom element ' +
+    'type is registered');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        var obj = doc.createElement(tagName);
+        var name = 'x-b-' + tagName;
+        var proto = Object.create(obj.constructor.prototype);
+        var GeneratedConstructor = doc.registerElement(name, {
+            prototype: proto,
+            extends: tagName
+        });
+        var customElement = new GeneratedConstructor();
+
+        assert_equals(customElement.ownerDocument, doc,
+            'Custom element owner document should be the document, where custom element ' +
+            'type is registered');
+    });
+}, 'Custom element constructor sets owner document to the document, where custom element ' +
+    'type is registered. Test constructor of extended HTML element');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var sharedRegistryDocument = doc.implementation.createHTMLDocument('Document 2');
+
+    var name = 'x-c';
+    var GeneratedConstructor = doc.registerElement(name);
+    var customElement = new GeneratedConstructor();
+    assert_equals(customElement.ownerDocument, doc,
+        'Custom element owner document should be the document, where custom element ' +
+        'type is registered');
+
+    var name2 = 'x-d';
+    var GeneratedConstructor2 = sharedRegistryDocument.registerElement(name2);
+    var customElement2 = new GeneratedConstructor2();
+    assert_equals(customElement2.ownerDocument, sharedRegistryDocument,
+        'Custom element owner document should be the document, where custom element ' +
+        'type is registered');
+}, 'Custom element constructor sets owner document to the document, where custom element ' +
+    'type is registered. Test different documents with shared registry');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var sharedRegistryDocument = doc.implementation.createHTMLDocument('Document 2');
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        var obj = doc.createElement(tagName);
+        var name = 'x-e-' + tagName;
+        var proto = Object.create(obj.constructor.prototype);
+        var GeneratedConstructor = doc.registerElement(name, {
+            prototype: proto,
+            extends: tagName
+        });
+        var customElement = new GeneratedConstructor();
+        assert_equals(customElement.ownerDocument, doc,
+            'Custom element owner document should be the document, where custom element ' +
+            'type is registered');
+
+        var obj2 = sharedRegistryDocument.createElement(tagName);
+        var name2 = 'x-f-' + tagName;
+        var proto2 = Object.create(obj2.constructor.prototype);
+        var GeneratedConstructor2 = sharedRegistryDocument.registerElement(name2, {
+            prototype: proto2,
+            extends: tagName
+        });
+        var customElement2 = new GeneratedConstructor2();
+        assert_equals(customElement2.ownerDocument, sharedRegistryDocument,
+            'Custom element owner document should be the document, where custom element ' +
+            'type is registered');
+    });
+}, 'Custom element constructor sets owner document to the document, where custom element ' +
+    'type is registered. Test constructor of extended HTML element for different documents ' +
+    'with shared registry');
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-constructor-prototype.html b/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-constructor-prototype.html
new file mode 100644
index 000000000..0158af511
--- /dev/null
+++ b/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-constructor-prototype.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Custom element constructor prototype is the prototype object specified in element definition</title>
+<meta name="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
+<meta name="assert" content="Custom element constructor prototype is the prototype object specified in element definition">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#registering-custom-elements">
+<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 = Object.create(SVGElement.prototype);
+    var GeneratedConstructor = doc.registerElement('x-a', {
+        prototype: proto,
+        extends: 'p'
+    });
+    assert_true(GeneratedConstructor.prototype === proto,
+        'Custom element constructor must have the prototype specified in registerElement()');
+}, 'If custom element type is registered with prototype, the custom element ' +
+   'constructor should have the prototype specified in registerElement() call');
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-prototype.html b/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-prototype.html
new file mode 100644
index 000000000..2b298ea74
--- /dev/null
+++ b/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-prototype.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Custom element prototype is the prototype object specified in element definition</title>
+<meta name="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
+<meta name="assert" content="Custom element prototype is the prototype object specified in element definition">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#instantiating-custom-elements">
+<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 = Object.create(SVGElement.prototype);
+    var GeneratedConstructor = doc.registerElement('x-a', {
+        prototype: proto,
+        extends: 'p'
+    });
+    var customElement = new GeneratedConstructor();
+
+    assert_true(Object.getPrototypeOf(customElement) === proto,
+        'Custom element instance must have the prototype specified in registerElement()');
+}, 'If custom element type is registered with prototype, the custom element ' +
+    'instance should have the prototype specified in registerElement() call');
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-type-is-attribute.html b/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-type-is-attribute.html
new file mode 100644
index 000000000..c18290d0e
--- /dev/null
+++ b/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-type-is-attribute.html
@@ -0,0 +1,73 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Instantiation of custom element: custom element type is given as the value of the IS attribute</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 custom element type is given to a custom element at the time of its instantation in one of the two ways: ... 2. As the value of the IS attribute of the custom element.">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#instantiating-custom-elements">
+<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();
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        if (HTML5_DOCUMENT_ELEMENTS.indexOf(tagName) !== -1) {
+            return;
+        }
+        var obj = doc.createElement(tagName);
+        var name = 'x-a-' + tagName;
+        var proto = Object.create(obj.constructor.prototype);
+        var GeneratedConstructor = doc.registerElement(name, {prototype: proto, extends: tagName});
+
+        if (HTML5_TABLE_ELEMENTS.indexOf(tagName) !== -1) {
+            doc.body.innerHTML =
+                '<table>' +
+                '<' + tagName + ' id="custom-element" is="' + name + '"></' + tagName + '>' +
+                '</table>';
+        } else {
+            doc.body.innerHTML =
+                '<' + tagName + ' id="custom-element" is="' + name + '"></' + tagName + '>';
+        }
+        var customElement = doc.querySelector('#custom-element');
+        assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+            'Custom element type should be the type, specified as value of IS attribute');
+    });
+}, 'Instantiation of custom element: custom element type is given as the value of ' +
+    'the IS attribute');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        if (HTML5_DOCUMENT_ELEMENTS.indexOf(tagName) !== -1) {
+            return;
+        }
+        var obj = doc.createElement(tagName);
+        var name = 'x-b-' + tagName;
+        if (HTML5_TABLE_ELEMENTS.indexOf(tagName) !== -1) {
+            doc.body.innerHTML =
+                '<table>' +
+                '<' + tagName + ' id="custom-element" is="' + name + '"></' + tagName + '>' +
+                '</table>';
+        } else {
+            doc.body.innerHTML =
+                '<' + tagName + ' id="custom-element" is="' + name + '"></' + tagName + '>';
+        }
+        var proto = Object.create(obj.constructor.prototype);
+        var GeneratedConstructor = doc.registerElement(name, {prototype: proto, extends: tagName});
+
+        var customElement = doc.querySelector('#custom-element');
+
+        assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+            'Custom element type should be the type, specified as value of IS attribute');
+    });
+}, 'Instantiation of custom element: custom element type is given as the value ' +
+    'of the IS attribute. Custom element is unresolved at first');
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-type-local-name-and-is-attribute.html b/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-type-local-name-and-is-attribute.html
new file mode 100644
index 000000000..c55e2cc25
--- /dev/null
+++ b/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-type-local-name-and-is-attribute.html
@@ -0,0 +1,101 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Instantiation of custom element: the custom tag must win over the type extension</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="If both types of custom element types are provided at the time of element's instantiation, the custom tag must win over the type extension">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#instantiating-custom-elements">
+<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 GeneratedConstructor = doc.registerElement('x-a');
+    doc.registerElement('x-b');
+    doc.body.innerHTML = '<x-a id="x-a" is="x-b"></x-a>';
+    var customElement = doc.querySelector('#x-a');
+
+    assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+        'Custom element type should be the type, specified in the local name of the element');
+}, 'Custom element type must be taken from the local name of the element even ' +
+    'if IS attribute provided.');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    doc.registerElement('x-d');
+    doc.body.innerHTML = '<x-c id="x-c" is="x-d"></x-c>';
+    var customElement = doc.querySelector('#x-c');
+
+    var GeneratedConstructor = doc.registerElement('x-c');
+    assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+        'Custom element type should be the type, specified in the local name of the element');
+}, 'Custom element type must be taken from the local name of the element even ' +
+    'if IS attribute provided. Custom element is unresolved at first');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var GeneratedConstructor = doc.registerElement('x-f');
+    doc.body.innerHTML = '<x-f id="x-f" is="x-e"></x-f>';
+    var customElement = doc.querySelector('#x-f');
+    assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+        'Custom element type should be the type, specified in local name of the element');
+
+    doc.registerElement('x-e');
+    assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+        'Custom element type should be the type, specified in local name of the element');
+}, 'Custom element type must be taken from the local name of the element even if IS ' +
+    'attribute provided. There\'s no definition for the value of IS attribute at first');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var GeneratedConstructor = doc.registerElement('x-element');
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        var obj = doc.createElement(tagName);
+        var name = 'x-d-' + tagName;
+        doc.registerElement(name, {
+            prototype: Object.create(obj.constructor.prototype),
+            extends: tagName
+        });
+        doc.body.innerHTML = '<x-element id="x-element" is="' + name + '"></x-element>';
+        var customElement = doc.querySelector('#x-element');
+        assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+            'Custom element type should be the local name of the custom element');
+    });
+}, 'Custom element type must be taken from the local name of the element even ' +
+    'if IS attribute provided. IS attribute refers to another custom element type, ' +
+    'which extends HTML5 elements');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    doc.registerElement('y-element');
+
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        var obj = doc.createElement(tagName);
+        var name = 'x-e-' + tagName;
+        var id = 'x-e-' + tagName;
+        doc.registerElement(name, {
+            prototype: Object.create(obj.constructor.prototype),
+            extends: tagName
+        });
+        doc.body.innerHTML = '<' + name + ' id="' + id + '" is="y-element"></' + name + '>';
+        var customElement = doc.querySelector('#' + id);
+        // We have <x-e-a is='y-element'>. Custom element type for this will be
+        // HTMLElement, not x-e-a (for x-e-a there should be <a is='x-e-a'>...)
+        assert_class_string(customElement, 'HTMLElement',
+            'Custom element type should be HTMLElement');
+    });
+}, 'Custom element type must be taken from the local name of the custom element even ' +
+    'if IS attribute provided. The element extends HTML5 elements, IS attribute refers ' +
+    'to another custom element type.');
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-type-local-name.html b/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-type-local-name.html
new file mode 100644
index 000000000..0f0d46f0a
--- /dev/null
+++ b/testing/web-platform/tests/custom-elements/v0/instantiating/custom-element-type-local-name.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Instantiation of custom element: custom element type is given via the local name of the custom element</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 custom element type is given to a custom element at the time of its instantation in one of the two ways: 1. As the local name of the custom element.">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#instantiating-custom-elements">
+<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 GeneratedConstructor = doc.registerElement('x-a');
+    doc.body.innerHTML = '<x-a id="x-a"></x-a>';
+    var customElement = doc.querySelector('#x-a');
+    assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+        'Custom element type should be the type, specified by the local name of ' +
+        'the custom element');
+}, 'Test custom element type, which is given via the local name of the custom element. ' +
+    'Custom element created via innerHTML property');
+
+
+testInIFrame('../resources/x-element.html', function(doc) {
+    var GeneratedConstructor = doc.registerElement('x-element');
+    var xelement = doc.querySelector('#x-element');
+    assert_equals(Object.getPrototypeOf(xelement), GeneratedConstructor.prototype,
+        'Custom element type should be the type, specified by the local name of ' +
+        'the custom element');
+}, 'Test custom element type, which is given via the local name of the custom element. ' +
+    'Custom element is defined in loaded HTML document');
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-interface-type-is-a-local-name.html b/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-interface-type-is-a-local-name.html
new file mode 100644
index 000000000..f59d6dcb8
--- /dev/null
+++ b/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-interface-type-is-a-local-name.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Document.createElement() and Document.createElementNS() create custom element of type, specified by localName argument</title>
+<meta name="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
+<meta name="assert" content="If an element definition with matching localName, namespace, and TYPE is not registered with token's document, set TYPE to localName">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#extensions-to-document-interface-to-instantiate">
+<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 name1 = 'x-a';
+    var name2 = 'x-b';
+    var GeneratedConstructor = doc.registerElement(name1);
+    var customElement = doc.createElement(name1, name2);
+
+    assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+        'Custom element type should be the local name of the custom element');
+}, 'Test Document.createElement() creates custom element of type, ' +
+    'specified by localName argument, if an element definition with matching localName, ' +
+    'namespace, and type is not registered');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var name1 = 'x-c';
+    var name2 = 'x-d';
+    var GeneratedConstructor = doc.registerElement(name1);
+    var customElement = doc.createElementNS(HTML_NAMESPACE, name1, name2);
+
+    assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+        'Custom element type should be the local name of the custom element');
+}, 'Test Document.createElementNS() creates custom element of type, ' +
+    'specified by localName argument, if an element definition with matching ' +
+    'localName, namespace, and type is not registered');
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-interface-type-is-a-type-extension.html b/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-interface-type-is-a-type-extension.html
new file mode 100644
index 000000000..3df042676
--- /dev/null
+++ b/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-interface-type-is-a-type-extension.html
@@ -0,0 +1,69 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Document.createElement() and Document.createElementNS() create custom element of type, specified by typeExtension argument</title>
+<meta name="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
+<meta name="assert" content="If an element definition with matching localName, namespace, and TYPE is registered then typeExtension is a TYPE">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#extensions-to-document-interface-to-instantiate">
+<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 name1 = 'x-a';
+    var GeneratedConstructor1 = doc.registerElement(name1);
+    var name2 = 'x-b';
+    var GeneratedConstructor2 = doc.registerElement(name2);
+    var customElement = doc.createElement(name1, name2);
+
+    assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor2.prototype,
+        'Custom element type should be the type extension of the custom element');
+}, 'Test Document.createElement() creates custom element of type, ' +
+    'specified by typeExtension argument');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var name1 = 'x-c';
+    var GeneratedConstructor1 = doc.registerElement(name1);
+    var name2 = 'x-d';
+    var GeneratedConstructor2 = doc.registerElement(name2);
+    var customElement = doc.createElementNS(HTML_NAMESPACE, name1, name2);
+
+    assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor2.prototype,
+        'Custom element type should be the type extension of the custom element');
+}, 'Test Document.createElementNS() creates custom element of type, ' +
+    'specified by typeExtension argument');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var name1 = 'x-e';
+    var name2 = 'x-f';
+    var GeneratedConstructor2 = doc.registerElement(name2);
+    var customElement = doc.createElement(name1, name2);
+
+    assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor2.prototype,
+        'Custom element type should be the type extension of the custom element');
+}, 'Test Document.createElement() creates custom element of type, ' +
+    'specified by typeExtension argument. Definition for localName is absent');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var name1 = 'x-g';
+    var name2 = 'x-h';
+    var GeneratedConstructor2 = doc.registerElement(name2);
+    var customElement = doc.createElementNS(HTML_NAMESPACE, name1, name2);
+
+    assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor2.prototype,
+        'Custom element type should be the type extension of the custom element');
+}, 'Test Document.createElementNS() creates custom element of type, ' +
+    'specified by typeExtension argument. Definition for localName is absent');
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-is-attribute.html b/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-is-attribute.html
new file mode 100644
index 000000000..374ec5922
--- /dev/null
+++ b/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-is-attribute.html
@@ -0,0 +1,71 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Document.createElement() and Document.createElementNS() set IS attribute to type</title>
+<meta name="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
+<meta name="assert" content="If TYPE is not the same as localName, set the value of ELEMENT's IS attribute to TYPE">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#extensions-to-document-interface-to-instantiate">
+<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();
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        var obj = doc.createElement(tagName);
+        var name = 'x-a-' + tagName;
+        var proto = Object.create(obj.constructor.prototype);
+        doc.registerElement(name, {prototype: proto, extends: tagName});
+        var customElement = doc.createElement(tagName, name);
+        assert_equals(customElement.getAttribute('is'), name,
+            'Value of the IS attribute should be set to type by Document.createElement()');
+    });
+}, 'Test Document.createElement() sets the element\'s IS attribute value to type, ' +
+    'if type is not the same as localName');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        var name = 'x-b-' + tagName;
+        var customElement = doc.createElement(tagName, name);
+        assert_equals(customElement.getAttribute('is'), name,
+            'Value of the IS attribute should be set to type by Document.createElement()');
+    });
+}, 'Test Document.createElement() sets the element\'s IS attribute value to type, ' +
+    'if type is not the same as localName and an element definition with matching ' +
+    'localName, namespace, and type is not registered');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        var obj = doc.createElement(tagName);
+        var name = 'x-c-' + tagName;
+        var proto = Object.create(obj.constructor.prototype);
+        doc.registerElement(name, {prototype: proto, extends: tagName});
+        var customElement = doc.createElementNS(HTML_NAMESPACE, tagName, name);
+        assert_equals(customElement.getAttribute('is'), name,
+            'Value of the IS attribute should be set to type by Document.createElementNS()');
+    });
+}, 'Test Document.createElementNS() sets the element\'s IS attribute value to type, ' +
+    'if type is not the same as localName');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        var name = 'x-d-' + tagName;
+        var customElement = doc.createElementNS(HTML_NAMESPACE, tagName, name);
+        assert_equals(customElement.getAttribute('is'), name,
+            'Value of the IS attribute should be set to type by Document.createElementNS()');
+    });
+}, 'Test Document.createElementNS() sets the element\'s IS attribute value to type, ' +
+    'if type is not the same as localNameand and an element definition with matching ' +
+    'localName, namespace, and type is not registered ');
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-namespace.html b/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-namespace.html
new file mode 100644
index 000000000..60d501219
--- /dev/null
+++ b/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-namespace.html
@@ -0,0 +1,68 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Document.createElement() sets custom element namespace to HTML Namespace</title>
+<meta name="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
+<meta name="assert" content="Namespace for createElement is HTML Namespace">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#extensions-to-document-interface-to-instantiate">
+<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 name = 'x-a';
+    doc.registerElement(name);
+    var customElement = doc.createElement(name);
+    assert_equals(customElement.namespaceURI, HTML_NAMESPACE,
+        'Custom element namespace should be HTML Namespace');
+}, 'Test Document.createElement() sets custom element namespace to HTML Namespace');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var name = 'x-b';
+    var customElement = doc.createElement(name);
+    assert_equals(customElement.namespaceURI, HTML_NAMESPACE,
+        'Custom element namespace should be HTML Namespace');
+}, 'Test Document.createElement() sets custom element namespace to HTML Namespace ' +
+    'and an element definition with matching localName, namespace, and type is not registered');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        var obj = doc.createElement(tagName);
+        var name = 'x-c-' + tagName;
+        var proto = Object.create(obj.constructor.prototype);
+        doc.registerElement(name, {
+            prototype: Object.create(proto),
+            extends: tagName
+        });
+        var customElement = doc.createElement(tagName, name);
+        assert_equals(customElement.namespaceURI, HTML_NAMESPACE,
+            'Custom element namespace for the element extending ' + tagName +
+            ' should be HTML Namespace');
+    });
+}, 'Document.createElement() sets custom element namespace to HTML Namespace. ' +
+    'Custom element is extending standard HTML tag');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        var name = 'x-d-' + tagName;
+        var customElement = doc.createElement(tagName, name);
+        assert_equals(customElement.namespaceURI, HTML_NAMESPACE,
+            'Custom element namespace for the element with tag name ' + tagName +
+            ' and type name ' + name + ' should be HTML Namespace');
+    });
+}, 'Document.createElement() sets custom element namespace to HTML Namespace. ' +
+    'Document.createElement() is called with standard HTML tag name and ' +
+    'type without registered custom element of such type');
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-type-extension-is-a-type.html b/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-type-extension-is-a-type.html
new file mode 100644
index 000000000..ce7c933e2
--- /dev/null
+++ b/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-type-extension-is-a-type.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Document.createElement() and Document.createElementNS() create custom element of type, specified by typeExtension argument</title>
+<meta name="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
+<meta name="assert" content="Let TYPE be typeExtension, or localName if typeExtension is not present">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#extensions-to-document-interface-to-instantiate">
+<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();
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        var obj = doc.createElement(tagName);
+        var name = 'x-a-' + tagName;
+        var proto = Object.create(obj.constructor.prototype);
+        var GeneratedConstructor = doc.registerElement(name, {prototype: proto, extends: tagName});
+        var customElement = doc.createElement(tagName, name);
+
+        assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+            'Custom element type should be ' + name);
+    });
+}, 'Test Document.createElement() creates custom element of type, ' +
+    'specified by typeExtension argument');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        var obj = doc.createElement(tagName);
+        var name = 'x-b-' + tagName;
+        var proto = Object.create(obj.constructor.prototype);
+        var GeneratedConstructor = doc.registerElement(name, {prototype: proto, extends: tagName});
+        var customElement = doc.createElementNS(HTML_NAMESPACE, tagName, name);
+
+        assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+            'Custom element type should be ' + name);
+    });
+}, 'Test Document.createElementNS() creates custom element of type, ' +
+    'specified by typeExtension argument');
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-type-extension-unresolved.html b/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-type-extension-unresolved.html
new file mode 100644
index 000000000..3eaadf312
--- /dev/null
+++ b/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-type-extension-unresolved.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Document.createElement() and Document.createElementNS() create custom element of type, specified by localName argument</title>
+<meta name="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
+<meta name="assert" content="If an element definition with matching localName, namespace, and TYPE is not registered with token's document, set TYPE to localName">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#extensions-to-document-interface-to-instantiate">
+<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();
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        var obj = doc.createElement(tagName);
+        var name = 'x-a-' + tagName;
+        var proto = Object.create(obj.constructor.prototype);
+        var customElement = doc.createElement(tagName, name);
+        assert_equals(Object.getPrototypeOf(customElement), Object.getPrototypeOf(obj),
+            'Unregistered custom element type should be a local name');
+
+        var GeneratedConstructor = doc.registerElement(name, {prototype: proto, extends: tagName});
+        assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+            'Registered custom element type should be the type extension');
+    });
+}, 'If typeExtension is unresolved when createElement called then local name is a type');
+
+
+test (function() {
+    var doc = newHTMLDocument();
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        var obj = doc.createElement(tagName);
+        var name = 'x-b-' + tagName;
+        var proto = Object.create(obj.constructor.prototype);
+        var customElement = doc.createElementNS(HTML_NAMESPACE, tagName, name);
+        assert_equals(Object.getPrototypeOf(customElement), Object.getPrototypeOf(obj),
+            'Custom element type should be a local name');
+
+        var GeneratedConstructor = doc.registerElement(name, {prototype: proto, extends: tagName});
+        assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+            'Custom element type should be the type extension');
+    });
+}, 'If typeExtension is unresolved when createElementNS called then local name is a type');
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-type-is-a-local-name.html b/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-type-is-a-local-name.html
new file mode 100644
index 000000000..487b14b9d
--- /dev/null
+++ b/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/create-element-type-is-a-local-name.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Document.createElement() and Document.createElementNS() create custom element of type, specified by single localName argument</title>
+<meta name="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
+<meta name="assert" content="Let TYPE be typeExtension, or localName if typeExtension is not present">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#extensions-to-document-interface-to-instantiate">
+<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 name = 'x-a';
+    var GeneratedConstructor = doc.registerElement(name);
+    var customElement = doc.createElement(name);
+
+    assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+        'Custom element type should be the local name of the custom element');
+}, 'Test Document.createElement() creates custom element of type, ' +
+    'specified by single localName argument');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var name = 'x-b';
+    var GeneratedConstructor = doc.registerElement(name);
+    var customElement = doc.createElementNS(HTML_NAMESPACE, name);
+    assert_equals(Object.getPrototypeOf(customElement), GeneratedConstructor.prototype,
+        'Custom element type should be the local name of the custom element');
+}, 'Test Document.createElementNS() creates custom element of type, ' +
+    'specified by localName argument. Argument typeExtension is not passed');
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/created-callback-create-element-ns.html b/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/created-callback-create-element-ns.html
new file mode 100644
index 000000000..7bf09601c
--- /dev/null
+++ b/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/created-callback-create-element-ns.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Document.createElementNS() must enqueue created callback for registered custom element type</title>
+<meta name="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
+<meta name="assert" content="Document.createElementNS() must enqueue created callback for registered custom element type">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#extensions-to-document-interface-to-instantiate">
+<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 name = 'x-a';
+
+    doc.registerElement(name, {prototype: proto});
+    var customElement = doc.createElementNS(HTML_NAMESPACE, name);
+    assert_equals(proto.createdCallbackCalledCounter, 1,
+        'Callback created should be enqueued by Document.createElementNS()');
+}, 'Test Document.createElementNS() without typeExtension argument enqueues created callback');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+    var name = 'x-b';
+
+    doc.registerElement(name, {prototype: proto});
+    var customElement = doc.createElementNS(HTML_NAMESPACE, name, name);
+    assert_equals(proto.createdCallbackCalledCounter, 1,
+        'Callback created should be enqueued by Document.createElementNS()');
+}, 'Test Document.createElementNS() with typeExtension argument enqueues created callback');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+    var name = 'x-c';
+    var customElement = doc.createElementNS(HTML_NAMESPACE, name);
+    assert_equals(proto.createdCallbackCalledCounter, 0,
+        'Document.createElementNS() should not enqueue created callback ' +
+        'for unresolved custom element');
+
+    doc.registerElement(name, {prototype: proto});
+    assert_equals(proto.createdCallbackCalledCounter, 1,
+        'Callback created should be called after custom element is registered');
+}, 'Document.createElementNS() should not enqueue created callback ' +
+    'for unresolved custom element');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        var obj = doc.createElement(tagName);
+        var name = 'x-d-' + tagName;
+        var proto = newCustomElementPrototype(Object.create(obj.constructor.prototype));
+        doc.registerElement(name, {prototype: proto, extends: tagName});
+        var customElement = doc.createElementNS(HTML_NAMESPACE, tagName, name);
+
+        assert_equals(proto.createdCallbackCalledCounter, 1,
+            'Callback created should be enqueued by Document.createElementNS()');
+    });
+}, 'Test Document.createElementNS() enqueues created callback for custom elements ' +
+    'that are extensions of HTML5 elements');
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/created-callback-create-element.html b/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/created-callback-create-element.html
new file mode 100644
index 000000000..dc05e01e1
--- /dev/null
+++ b/testing/web-platform/tests/custom-elements/v0/instantiating/extensions-to-document-interface/created-callback-create-element.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Document.createElement() must enqueue created callback for registered custom element type</title>
+<meta name="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
+<meta name="assert" content="Document.createElement() must enqueue created callback for registered custom element type">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#extensions-to-document-interface-to-instantiate">
+<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 name = 'x-a';
+
+    doc.registerElement(name, {prototype: proto});
+    var customElement = doc.createElement(name);
+    assert_equals(proto.createdCallbackCalledCounter, 1,
+        'Callback created should be enqueued by Document.createElement()');
+}, 'Test Document.createElement() without typeExtension argument enqueues created callback');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+    var name = 'x-b';
+
+    doc.registerElement(name, {prototype: proto});
+    var customElement = doc.createElement(name, name);
+    assert_equals(proto.createdCallbackCalledCounter, 1,
+        'Callback created should be enqueued by Document.createElement()');
+}, 'Test Document.createElement() with typeExtension argument enqueues created callback');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = newHTMLElementPrototype();
+    var name = 'x-c';
+    var customElement = doc.createElement(name);
+    assert_equals(proto.createdCallbackCalledCounter, 0,
+        'Document.createElement() should not enqueue created callback ' +
+        'for unresolved custom element');
+
+    doc.registerElement(name, {prototype: proto});
+    assert_equals(proto.createdCallbackCalledCounter, 1,
+        'Callback created should be called after custom element is registered');
+}, 'Document.createElement() should not enqueue created callback ' +
+    'for unresolved custom element');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        var obj = doc.createElement(tagName);
+        var name = 'x-d-' + tagName;
+        var proto = newCustomElementPrototype(Object.create(obj.constructor.prototype));
+        doc.registerElement(name, {prototype: proto, extends: tagName});
+        var customElement = doc.createElement(tagName, name);
+
+        assert_equals(proto.createdCallbackCalledCounter, 1,
+            'Callback created should be enqueued by Document.createElement()');
+    });
+}, 'Test Document.createElement() enqueues created callback for custom elements ' +
+    'that are extensions of HTML5 elements');
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/custom-elements/v0/instantiating/non-configurable-constructor-property.html b/testing/web-platform/tests/custom-elements/v0/instantiating/non-configurable-constructor-property.html
new file mode 100644
index 000000000..ddb1ff9de
--- /dev/null
+++ b/testing/web-platform/tests/custom-elements/v0/instantiating/non-configurable-constructor-property.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>If prototype has a non-configurable property named constructor, Document.registerElement() throws NotSupportedError</title>
+<meta name="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
+<meta name="assert" content="If  PROTOTYPE has a non-configurable property named constructor, throw a NotSupportedError and stop">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#instantiating-custom-elements">
+<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 = Object.create(HTMLElement.prototype);
+    Object.defineProperty(proto, 'constructor', {configurable: false});
+    assert_throws('NotSupportedError', function() {
+        doc.registerElement('x-a', {prototype: proto});
+    }, 'Exception should be thrown in case of attempt to register element ' +
+        'with a non-configurable property named constructor');
+}, 'Test Document.registerElement() throws NotSupportedError ' +
+    'if prototype has a non-configurable property named constructor');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = Object.create(HTMLElement.prototype);
+    Object.defineProperty(proto, 'constructor', {configurable: true});
+    try {
+        doc.registerElement('x-b', {prototype: proto});
+    } catch (e) {
+        assert_unreached('Exception should not be thrown in case of attempt to register ' +
+            'element with a configurable property named constructor');
+    }
+}, 'Test Document.registerElement() accepts prototype with a configurable ' +
+    'property named constructor without throwing errors');
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/custom-elements/v0/instantiating/prototype-is-interface-prototype-object.html b/testing/web-platform/tests/custom-elements/v0/instantiating/prototype-is-interface-prototype-object.html
new file mode 100644
index 000000000..ad7f454f5
--- /dev/null
+++ b/testing/web-platform/tests/custom-elements/v0/instantiating/prototype-is-interface-prototype-object.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>If prototype is already an interface prototype object, Document.registerElement() throws a NotSupportedError</title>
+<meta name="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
+<meta name="assert" content="If PROTOTYPE is already an interface prototype object for any interface object, throw a NotSupportedError and stop">
+<link rel="help" href="http://www.w3.org/TR/custom-elements/#instantiating-custom-elements">
+<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();
+    HTML5_ELEMENTS.forEach(function(tagName) {
+        var obj = doc.createElement(tagName);
+        var name = 'x-a-' + tagName;
+        assert_throws('NotSupportedError', function() {
+            doc.registerElement(name, {prototype: obj.constructor.prototype});
+        }, 'Exception should be thrown in case of attempt to register element ' +
+            'if prototype is already an interface prototype object (' + name + ')');
+    });
+}, 'Test Document.registerElement() throws NotSupportedError ' +
+    'if prototype is already an interface prototype object');
+
+
+test(function() {
+    var doc = newHTMLDocument();
+    var proto = Object.create(HTMLElement.prototype);
+    doc.registerElement('x-b', {
+        prototype: proto
+    });
+    assert_throws('NotSupportedError', function() {
+        doc.registerElement('x-b', {
+            prototype: proto
+        });
+    }, 'Exception should be thrown if registring custom element type with already used prototype');
+}, 'Test Document.registerElement() throws NotSupportedError ' +
+    'if prototype is already used for another custom element type');
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/custom-elements/v0/instantiating/unchanged-attribute.html b/testing/web-platform/tests/custom-elements/v0/instantiating/unchanged-attribute.html
new file mode 100644
index 000000000..3baa174cb
--- /dev/null
+++ b/testing/web-platform/tests/custom-elements/v0/instantiating/unchanged-attribute.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Custom element's type is immutable.</title>
+<meta name="author" title="Bon-Yong Lee" href="mailto:bylee78@gmail.com">
+<meta name="assert" content="After a custom element is instantiated, changing the value of the is attribute must not affect this element's custom element type.">
+<link rel="help" href="http://w3c.github.io/webcomponents/spec/custom/#instantiating-custom-elements">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script type="text/javascript">
+test(function() {
+  var CustomButton = document.registerElement('custom-button', {
+    prototype: Object.create(HTMLButtonElement.prototype),
+    extends: 'button'
+  });
+  var customButton = document.createElement('button', 'custom-button');
+
+  assert_true(customButton instanceof CustomButton,
+              'A custom element is of the custom element type after ' +
+              'instantiation');
+  customButton.setAttribute('is', 'dirty');
+  assert_equals('dirty', customButton.getAttribute('is'),
+                'An attribute must be changed by method "setAttribute"');
+
+  assert_true(customButton instanceof CustomButton,
+              'A custom element is of the original custom element type even ' +
+              'after changing the \'is\' attribute');
+}, 'After a custom element is instantiated, changing the value of the is attribute must not affect this element\'s custom element type.');
+</script>
-- 
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