| <!DOCTYPE html> |
| <title>Shadow DOM: Attaching a ShadowRoot for custom elements</title> |
| <meta name="author" title="Hayato Ito" href="mailto:hayato@chromium.org"> |
| <link rel="help" href="https://dom.spec.whatwg.org/#dom-element-attachshadow"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script> |
| class MyAutonomousCustomElement extends HTMLElement { |
| } |
| |
| customElements.define('my-custom', MyAutonomousCustomElement); |
| |
| test(() => { |
| assert_true(document.createElement('my-custom').attachShadow({mode: "open"}) instanceof ShadowRoot); |
| }, 'Element.attachShadow must create an instance of ShadowRoot for autonomous custom elements'); |
| |
| test(() => { |
| assert_true(document.createElement('undefined-custom').attachShadow({mode: 'open'}) instanceof ShadowRoot); |
| }, 'Element.attachShadow must create an instance of ShadowRoot for undefined autonomous custom elements'); |
| |
| test(() => { |
| class ShadowDisabledElement extends HTMLElement { |
| static get disabledFeatures() { return ['shadow']; } |
| } |
| |
| // No definition. attachShadow() should succeed. |
| let element = document.createElement('shadow-disabled-element'); |
| element.attachShadow({mode: 'closed'}); |
| |
| // No definition and it's already a host. |
| assert_throws('NotSupportedError', () => { |
| element.attachShadow({mode: 'closed'}); |
| }, 'No definition, host'); |
| |
| // The element has a definition, and it's already a host. |
| customElements.define('shadow-disabled-element', ShadowDisabledElement); |
| assert_throws('NotSupportedError', () => { |
| element.attachShadow({mode: 'closed'}); |
| }, 'Definition, host'); |
| |
| // The element has a definition, and it's not a host. |
| assert_throws('NotSupportedError', () => { |
| document.createElement('shadow-disabled-element').attachShadow({mode: 'closed'}); |
| }, 'Definition, not a host'); |
| }, 'Element.attachShadow for an autonomous custom element with ' + |
| 'disabledFeatures=["shadow"] should throw a NotSupportedError'); |
| |
| test(() => { |
| class ShadowDisabledHeadingElement extends HTMLHeadingElement { |
| static get disabledFeatures() { return ['shadow']; } |
| } |
| |
| // No definition. attachShadow() should succeed. |
| let element = document.createElement('h2', |
| {is: 'shadow-disabled-heading-element'}); |
| element.attachShadow({mode: 'closed'}); |
| |
| // No definition and it's already a host. |
| assert_throws('NotSupportedError', () => { |
| element.attachShadow({mode: 'closed'}); |
| }, 'No definition, host.'); |
| |
| // The element has a definition, and it's already a host. |
| customElements.define('shadow-disabled-heading-element', |
| ShadowDisabledHeadingElement, {extends: 'h2'}); |
| assert_throws('NotSupportedError', () => { |
| element.attachShadow({mode: 'closed'}); |
| }, 'Definition, host'); |
| |
| // The element has a definition, and it's not a host. |
| let h2 = document.createElement('h2', {is: 'shadow-disabled-heading-element'}); |
| assert_throws('NotSupportedError', () => { |
| h2.attachShadow({mode: 'closed'}); |
| }, 'Definition, not a host'); |
| }, 'Element.attachShadow for a customized built-in element with ' + |
| 'disabledFeatures=["shadow"] should throw a NotSupportedError'); |
| |
| test(() => { |
| class CapitalShadowDisabledElement extends HTMLElement { |
| static get disabledFeatures() { return ['shadow']; } |
| } |
| |
| customElements.define('capital-shadow-disabled-element', CapitalShadowDisabledElement); |
| |
| // Test fails if this throws |
| document.createElement('capital-shadow-disabled-element').attachShadow({mode: 'open'}); |
| }, 'Element.attachShadow for a custom element with disabledFeatures=["SHADOW"] should not throw a NotSupportedError'); |
| |
| class MyCustomizedBuiltinElement extends HTMLInputElement { |
| } |
| |
| customElements.define('my-input', MyCustomizedBuiltinElement, { extends: 'input' }); |
| |
| test(() => { |
| assert_throws({'name': 'NotSupportedError'}, () => { |
| document.createElement('input', {is: 'my-input'}).attachShadow({mode: "open"}); |
| }); |
| }, 'Element.attachShadow must throw a NotSupportedError for customized built-in elements'); |
| </script> |
| </body> |
| </html> |
