| <!DOCTYPE HTML> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script> |
| class TestElement extends HTMLElement { |
| constructor() { |
| super(); |
| this._internals = this.attachInternals(); |
| } |
| |
| get internals() { |
| return this._internals; |
| } |
| |
| set internals(val) { |
| throw "Can't set internals!"; |
| } |
| } |
| customElements.define("test-element", TestElement); |
| </script> |
| |
| <test-element id= "testElement"></test-element> |
| |
| <script> |
| const element = document.getElementById("testElement"); |
| |
| |
| // tentative properties |
| const properties = [ |
| "ariaColIndexText", |
| "ariaDescription", |
| "ariaRowIndexText", |
| ]; |
| |
| for (const property of properties) { |
| test(() => { |
| assert_inherits(element.internals, property); |
| }, property + " is defined in ElementInternals"); |
| } |
| |
| </script> |
