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96 lines
4.5 KiB
HTML
96 lines
4.5 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<title>Custom Elements: HTMLElement must allow subclassing</title>
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<meta name="author" title="Ryosuke Niwa" href="mailto:rniwa@webkit.org">
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<meta name="assert" content="HTMLElement must allow subclassing">
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<link rel="help" href="https://html.spec.whatwg.org/#html-element-constructors">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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</head>
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<body>
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<div id="log"></div>
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<script>
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test(function () {
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customElements.define('html-custom-element', HTMLElement);
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assert_throws({'name': 'TypeError'}, function () { new HTMLElement(); });
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}, 'HTMLElement constructor must throw a TypeError when NewTarget is equal to itself');
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test(function () {
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customElements.define('html-proxy-custom-element', new Proxy(HTMLElement, {}));
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assert_throws({'name': 'TypeError'}, function () { new HTMLElement(); });
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}, 'HTMLElement constructor must throw a TypeError when NewTarget is equal to itself via a Proxy object');
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test(function () {
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class SomeCustomElement extends HTMLElement {};
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assert_throws({'name': 'TypeError'}, function () { new SomeCustomElement; });
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}, 'HTMLElement constructor must throw TypeError when it has not been defined by customElements.define');
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test(function () {
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class SomeCustomElement extends HTMLParagraphElement {};
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customElements.define('some-custom-element', SomeCustomElement);
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assert_throws({'name': 'TypeError'}, function () { new SomeCustomElement(); });
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}, 'Custom element constructor must throw TypeError when it does not extend HTMLElement');
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test(function () {
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class SomeCustomButtonElement extends HTMLButtonElement {};
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customElements.define('some-custom-button-element', SomeCustomButtonElement, { extends: "p" });
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assert_throws({'name': 'TypeError'}, function () { new SomeCustomButtonElement(); });
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}, 'Custom element constructor must throw TypeError when it does not extend the proper element interface');
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test(function () {
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class CustomElementWithInferredTagName extends HTMLElement {};
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customElements.define('inferred-name', CustomElementWithInferredTagName);
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var instance = new CustomElementWithInferredTagName;
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assert_true(instance instanceof Element, 'A custom element must inherit from Element');
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assert_true(instance instanceof Node, 'A custom element must inherit from Node');
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assert_equals(instance.localName, 'inferred-name');
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assert_equals(instance.nodeName, 'INFERRED-NAME');
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assert_equals(instance.namespaceURI, 'http://www.w3.org/1999/xhtml', 'A custom HTML element must use HTML namespace');
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document.body.appendChild(instance);
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assert_equals(document.body.lastChild, instance,
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'document.body.appendChild must be able to insert a custom element');
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assert_equals(document.querySelector('inferred-name'), instance,
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'document.querySelector must be able to find a custom element by its tag name');
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}, 'HTMLElement constructor must infer the tag name from the element interface');
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test(function () {
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class ConcreteCustomElement extends HTMLElement { };
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class SubCustomElement extends ConcreteCustomElement { };
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customElements.define('concrete-custom-element', ConcreteCustomElement);
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customElements.define('sub-custom-element', SubCustomElement);
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var instance = new ConcreteCustomElement();
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assert_true(instance instanceof ConcreteCustomElement);
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assert_false(instance instanceof SubCustomElement);
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assert_equals(instance.localName, 'concrete-custom-element');
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assert_equals(instance.nodeName, 'CONCRETE-CUSTOM-ELEMENT');
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var instance = new SubCustomElement();
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assert_true(instance instanceof ConcreteCustomElement);
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assert_true(instance instanceof SubCustomElement);
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assert_equals(instance.localName, 'sub-custom-element');
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assert_equals(instance.nodeName, 'SUB-CUSTOM-ELEMENT');
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}, 'HTMLElement constructor must allow subclassing a custom element');
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test(function () {
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class AbstractCustomElement extends HTMLElement { };
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class ConcreteSubCustomElement extends AbstractCustomElement { };
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customElements.define('concrete-sub-custom-element', ConcreteSubCustomElement);
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var instance = new ConcreteSubCustomElement();
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assert_true(instance instanceof AbstractCustomElement);
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assert_true(instance instanceof ConcreteSubCustomElement);
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assert_equals(instance.localName, 'concrete-sub-custom-element');
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assert_equals(instance.nodeName, 'CONCRETE-SUB-CUSTOM-ELEMENT');
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}, 'HTMLElement constructor must allow subclassing an user-defined subclass of HTMLElement');
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</script>
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</body>
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</html>
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