| <!DOCTYPE html> |
| <meta charset="utf-8"> |
| <title>Declarative Shadow DOM Errors</title> |
| |
| <script src="../resources/js-test.js"></script> |
| |
| <!-- |
| 1. If shadow host’s namespace is not the HTML namespace, then throw a |
| "NotSupportedError" DOMException. |
| 2. If shadow host’s local name is not a valid custom element name, |
| "article", "aside", "blockquote", "body", "div", "footer", "h1", "h2", |
| "h3", "h4", "h5", "h6", "header", "main", "nav", "p", "section", or "span", |
| then throw a "NotSupportedError" DOMException. |
| --> |
| <video> |
| <template shadowroot=open> |
| </template> |
| </video> |
| |
| <!-- |
| 3. If shadow host’s local name is a valid custom element name, or shadow |
| host’s is value is not null, then: |
| 3.1 Let definition be the result of looking up a custom element |
| definition given shadow host’s node document, its namespace, its local |
| name, and its is value. |
| 3.2 If definition is not null and definition’s |
| disable shadow is true, then throw a "NotSupportedError" DOMException. |
| --> |
| <script> |
| class ShadowDisabledElement extends HTMLElement { |
| static get disabledFeatures() { return ['shadow']; } |
| } |
| customElements.define('shadow-disabled-element', ShadowDisabledElement); |
| </script> |
| <shadow-disabled-element> |
| <template shadowroot=open> |
| </template> |
| </shadow-disabled-element> |
| |
| <!-- |
| 4. If shadow host has a non-null shadow root whose "is declarative shadow |
| root" property is false, then throw an "NotSupportedError" DOMException. |
| --> |
| <div id=host> |
| <span></span> |
| <script> |
| host.attachShadow({mode:'open'}); |
| </script> |
| <template shadowroot=open> |
| </template> |
| </div> |
| |
