User interface components with changing states (e.g. checkboxes) include properties such as aria-checked, aria-selected or aria-expanded.
Invalid aria-checked value:
This custom checkbox has an invalid aria-checked attribute:
(e.g. aria-checked="yryreiuwyeriuyew" by default)
Note: Auto-testing is possible. Can be done by checking if aria-checked attributes have valid values (true, false, mixed, undefined).