| <!DOCTYPE html> |
| <body> |
| <script src="../../resources/testharness.js"></script> |
| <script src="../../resources/testharnessreport.js"></script> |
| <script> |
| test(() => { |
| class MyElement1 extends HTMLElement {} |
| customElements.define('my-element1', MyElement1); |
| const element = new MyElement1(); |
| const internals = element.attachInternals(); |
| |
| assert_throws('InvalidStateError', () => { internals.setFormValue(''); }); |
| assert_throws('InvalidStateError', () => { internals.form; }); |
| }, 'Form-related operations and attributes should throw InvalidStateErrors for' + |
| 'non-form-associated custom elements.'); |
| </script> |
| </body> |
