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