Revamped testbed

State change detection (4.1.2.state-changes)

User interface components with changing states (e.g. checkboxes) include properties such as aria-checked, aria-selected or aria-expanded.

(Actual checkboxes as in <input type="checkbox"> elements do not require an aria-checked attribute.)

Note: Auto-testing is (partially) possible. Can be done by programmatically checking if elements with roles such as "checkbox" have an aria-checked attribute. However, automatically figuring out if an aria-checked attribute is necessary might require a human tester/AI.