| PASS | default checkbox has no checkedness state | |
| PASS | checkbox with initial state set to checked has checkedness state | |
| PASS | changing the checked attribute to a string sets the checkedness state | |
| PASS | a checkbox has an indeterminate state set to false onload | |
| PASS | on setting, a checkbox's indeterminate state must be set to the new value and returns the last value it was set to | |
| PASS | default/on: on getting, if the element has a value attribute, it must return that attribute's value; otherwise, it must return the string 'on' | |
| PASS | on getting, if the element has a value attribute, it must return that attribute's value | |