third_party/web_platform_tests/custom-elements/instantiating-custom-elements/changing-is-attribute.html

<!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>
<link rel="stylesheet" href="/resources/testharness.css">
</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>