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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 17:32:43 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 17:32:43 +0000
commit6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch)
treea68f146d7fa01f0134297619fbe7e33db084e0aa /testing/web-platform/tests/custom-elements/HTMLElement-constructor.html
parentInitial commit. (diff)
downloadthunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.tar.xz
thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.zip
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+<!DOCTYPE html>
+<html>
+<head>
+<title>Custom Elements: HTMLElement must allow subclassing</title>
+<meta name="author" title="Ryosuke Niwa" href="mailto:rniwa@webkit.org">
+<meta name="assert" content="HTMLElement must allow subclassing">
+<link rel="help" href="https://html.spec.whatwg.org/#html-element-constructors">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<div id="log"></div>
+<script>
+
+test(function () {
+ customElements.define('html-custom-element', HTMLElement);
+ assert_throws_js(TypeError, function () { new HTMLElement(); });
+}, 'HTMLElement constructor must throw a TypeError when NewTarget is equal to itself');
+
+test(function () {
+ customElements.define('html-proxy-custom-element', new Proxy(HTMLElement, {}));
+ assert_throws_js(TypeError, function () { new HTMLElement(); });
+}, 'HTMLElement constructor must throw a TypeError when NewTarget is equal to itself via a Proxy object');
+
+test(function () {
+ class SomeCustomElement extends HTMLElement {};
+ assert_throws_js(TypeError, function () { new SomeCustomElement; });
+}, 'HTMLElement constructor must throw TypeError when it has not been defined by customElements.define');
+
+test(function () {
+ class SomeCustomElement extends HTMLParagraphElement {};
+ customElements.define('some-custom-element', SomeCustomElement);
+ assert_throws_js(TypeError, function () { new SomeCustomElement(); });
+}, 'Custom element constructor must throw TypeError when it does not extend HTMLElement');
+
+test(function () {
+ class SomeCustomButtonElement extends HTMLButtonElement {};
+ customElements.define('some-custom-button-element', SomeCustomButtonElement, { extends: "p" });
+ assert_throws_js(TypeError, function () { new SomeCustomButtonElement(); });
+}, 'Custom element constructor must throw TypeError when it does not extend the proper element interface');
+
+test(function () {
+ class CustomElementWithInferredTagName extends HTMLElement {};
+ customElements.define('inferred-name', CustomElementWithInferredTagName);
+
+ var instance = new CustomElementWithInferredTagName;
+ assert_true(instance instanceof Element, 'A custom element must inherit from Element');
+ assert_true(instance instanceof Node, 'A custom element must inherit from Node');
+ assert_equals(instance.localName, 'inferred-name');
+ assert_equals(instance.nodeName, 'INFERRED-NAME');
+ assert_equals(instance.namespaceURI, 'http://www.w3.org/1999/xhtml', 'A custom HTML element must use HTML namespace');
+
+ document.body.appendChild(instance);
+ assert_equals(document.body.lastChild, instance,
+ 'document.body.appendChild must be able to insert a custom element');
+ assert_equals(document.querySelector('inferred-name'), instance,
+ 'document.querySelector must be able to find a custom element by its tag name');
+
+}, 'HTMLElement constructor must infer the tag name from the element interface');
+
+test(function () {
+ class ConcreteCustomElement extends HTMLElement { };
+ class SubCustomElement extends ConcreteCustomElement { };
+ customElements.define('concrete-custom-element', ConcreteCustomElement);
+ customElements.define('sub-custom-element', SubCustomElement);
+
+ var instance = new ConcreteCustomElement();
+ assert_true(instance instanceof ConcreteCustomElement);
+ assert_false(instance instanceof SubCustomElement);
+ assert_equals(instance.localName, 'concrete-custom-element');
+ assert_equals(instance.nodeName, 'CONCRETE-CUSTOM-ELEMENT');
+
+ var instance = new SubCustomElement();
+ assert_true(instance instanceof ConcreteCustomElement);
+ assert_true(instance instanceof SubCustomElement);
+ assert_equals(instance.localName, 'sub-custom-element');
+ assert_equals(instance.nodeName, 'SUB-CUSTOM-ELEMENT');
+
+}, 'HTMLElement constructor must allow subclassing a custom element');
+
+test(function () {
+ class AbstractCustomElement extends HTMLElement { };
+ class ConcreteSubCustomElement extends AbstractCustomElement { };
+ customElements.define('concrete-sub-custom-element', ConcreteSubCustomElement);
+
+ var instance = new ConcreteSubCustomElement();
+ assert_true(instance instanceof AbstractCustomElement);
+ assert_true(instance instanceof ConcreteSubCustomElement);
+ assert_equals(instance.localName, 'concrete-sub-custom-element');
+ assert_equals(instance.nodeName, 'CONCRETE-SUB-CUSTOM-ELEMENT');
+
+}, 'HTMLElement constructor must allow subclassing an user-defined subclass of HTMLElement');
+
+test(function() {
+ class SomeCustomElement extends HTMLElement {};
+ var getCount = 0;
+ var countingProxy = new Proxy(SomeCustomElement, {
+ get: function(target, prop, receiver) {
+ if (prop == "prototype") {
+ ++getCount;
+ }
+ return Reflect.get(target, prop, receiver);
+ }
+ });
+ customElements.define("success-counting-element-1", countingProxy);
+ // define() gets the prototype of the constructor it's passed, so
+ // reset the counter.
+ getCount = 0;
+ var instance = new countingProxy();
+ assert_equals(getCount, 1, "Should have gotten .prototype once");
+ assert_true(instance instanceof countingProxy);
+ assert_true(instance instanceof HTMLElement);
+ assert_true(instance instanceof SomeCustomElement);
+ assert_equals(instance.localName, "success-counting-element-1");
+ assert_equals(instance.nodeName, "SUCCESS-COUNTING-ELEMENT-1");
+}, 'HTMLElement constructor must only get .prototype once, calling proxy constructor directly');
+
+test(function() {
+ class SomeCustomElement extends HTMLElement {};
+ var getCount = 0;
+ var countingProxy = new Proxy(SomeCustomElement, {
+ get: function(target, prop, receiver) {
+ if (prop == "prototype") {
+ ++getCount;
+ }
+ return Reflect.get(target, prop, receiver);
+ }
+ });
+ customElements.define("success-counting-element-2", countingProxy);
+ // define() gets the prototype of the constructor it's passed, so
+ // reset the counter.
+ getCount = 0;
+ var instance = Reflect.construct(HTMLElement, [], countingProxy);
+ assert_equals(getCount, 1, "Should have gotten .prototype once");
+ assert_true(instance instanceof countingProxy);
+ assert_true(instance instanceof HTMLElement);
+ assert_true(instance instanceof SomeCustomElement);
+ assert_equals(instance.localName, "success-counting-element-2");
+ assert_equals(instance.nodeName, "SUCCESS-COUNTING-ELEMENT-2");
+}, 'HTMLElement constructor must only get .prototype once, calling proxy constructor via Reflect');
+
+test(function() {
+ class SomeCustomElement {};
+ var getCount = 0;
+ var countingProxy = new Proxy(SomeCustomElement, {
+ get: function(target, prop, receiver) {
+ if (prop == "prototype") {
+ ++getCount;
+ }
+ return Reflect.get(target, prop, receiver);
+ }
+ });
+ customElements.define("success-counting-element-3", countingProxy);
+ // define() gets the prototype of the constructor it's passed, so
+ // reset the counter.
+ getCount = 0;
+ var instance = Reflect.construct(HTMLElement, [], countingProxy);
+ assert_equals(getCount, 1, "Should have gotten .prototype once");
+ assert_true(instance instanceof countingProxy);
+ assert_true(instance instanceof SomeCustomElement);
+ assert_equals(instance.localName, undefined);
+ assert_equals(instance.nodeName, undefined);
+}, 'HTMLElement constructor must only get .prototype once, calling proxy constructor via Reflect with no inheritance');
+
+test(function() {
+ class SomeCustomElement extends HTMLElement {};
+ var getCount = 0;
+ var countingProxy = new Proxy(SomeCustomElement, {
+ get: function(target, prop, receiver) {
+ if (prop == "prototype") {
+ ++getCount;
+ }
+ return Reflect.get(target, prop, receiver);
+ }
+ });
+
+ // Purposefully don't register it.
+ assert_throws_js(TypeError,
+ function () { Reflect.construct(HTMLElement, [], countingProxy) },
+ "Should not be able to construct an HTMLElement named 'button'");
+ assert_equals(getCount, 0, "Should never have gotten .prototype");
+}, 'HTMLElement constructor must not get .prototype until it finishes its registration sanity checks, calling via Reflect');
+</script>
+</body>
+</html>
+
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