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91 lines
4 KiB
HTML
91 lines
4 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<title>Custom Elements: Changes to the HTML parser</title>
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<meta name="author" title="Ryosuke Niwa" href="mailto:rniwa@webkit.org">
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<meta name="assert" content="HTML parser must fallback to creating a HTMLUnknownElement when a custom element construction fails">
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<link rel="help" href="https://html.spec.whatwg.org/#create-an-element-for-the-token">
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<link rel="help" href="https://dom.spec.whatwg.org/#concept-create-element">
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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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setup({allow_uncaught_exception:true});
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class ReturnsTextNode extends HTMLElement {
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constructor() {
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super();
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return document.createTextNode('some text');
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}
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};
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customElements.define('returns-text', ReturnsTextNode);
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class ReturnsNonElementObject extends HTMLElement {
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constructor() {
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super();
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return {};
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}
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};
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customElements.define('returns-non-element-object', ReturnsNonElementObject);
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class LacksSuperCall extends HTMLElement {
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constructor() { }
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};
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customElements.define('lacks-super-call', LacksSuperCall);
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class ThrowsException extends HTMLElement {
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constructor() {
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throw 'Bad';
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}
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};
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customElements.define('throws-exception', ThrowsException);
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</script>
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<returns-text></returns-text>
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<returns-non-element-object></returns-non-element-object>
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<lacks-super-call></lacks-super-call>
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<throws-exception></throws-exception>
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<script>
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test(function () {
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var instance = document.querySelector('returns-text');
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assert_false(instance instanceof ReturnsTextNode, 'HTML parser must NOT instantiate a custom element when the constructor returns a Text node');
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assert_true(instance instanceof HTMLElement, 'The fallback element created by HTML parser must be an instance of HTMLElement');
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assert_true(instance instanceof HTMLUnknownElement, 'The fallback element created by HTML parser must be an instance of HTMLUnknownElement');
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}, 'HTML parser must create a fallback HTMLUnknownElement when a custom element constructor returns a Text node');
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test(function () {
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var instance = document.querySelector('returns-non-element-object');
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assert_false(instance instanceof ReturnsNonElementObject, 'HTML parser must NOT instantiate a custom element when the constructor returns a non-Element object');
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assert_true(instance instanceof HTMLElement, 'The fallback element created by HTML parser must be an instance of HTMLElement');
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assert_true(instance instanceof HTMLUnknownElement, 'The fallback element created by HTML parser must be an instance of HTMLUnknownElement');
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}, 'HTML parser must create a fallback HTMLUnknownElement when a custom element constructor returns non-Element object');
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test(function () {
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var instance = document.querySelector('lacks-super-call');
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assert_false(instance instanceof LacksSuperCall, 'HTML parser must NOT instantiate a custom element when the constructor does not call super()');
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assert_true(instance instanceof HTMLElement, 'The fallback element created by HTML parser must be an instance of HTMLElement');
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assert_true(instance instanceof HTMLUnknownElement, 'The fallback element created by HTML parser must be an instance of HTMLUnknownElement');
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}, 'HTML parser must create a fallback HTMLUnknownElement when a custom element constructor does not call super()');
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test(function () {
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var instance = document.querySelector('throws-exception');
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assert_false(instance instanceof ThrowsException, 'HTML parser must NOT instantiate a custom element when the constructor throws an exception');
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assert_true(instance instanceof HTMLElement, 'The fallback element created by HTML parser must be an instance of HTMLElement');
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assert_true(instance instanceof HTMLUnknownElement, 'The fallback element created by HTML parser must be an instance of HTMLUnknownElement');
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}, 'HTML parser must create a fallback HTMLUnknownElement when a custom element constructor throws an exception');
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</script>
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</body>
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</html>
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