Testing `aria-readonly`

Used in the post Brief Note on aria-readonly Support.

These controls, with the exception of #6a (the second ARIA checkbox) in no way programmatically prevent interaction. There is no script to limit their function (again, except the ARIA checkbox).

Testing `aria-readonly`

1. Uses `aria-readonly` with `radiogroup` Role on a `<fieldset>`

2. Uses `aria-readonly` with `radiogroup` Role

3. APG Combobox with `aria-readonly` on the `combobox` and `listbox` Roles

4. APG Listbox with `aria-readonly`

5. Native checkbox with `aria-readonly`

6. `checkbox` Role with `aria-readonly`

6a. `checkbox` Role with `aria-readonly` and Checking Disallowed

Testing aria-readonly

1. Uses aria-readonly with radiogroup Role on a <fieldset>

2. Uses aria-readonly with radiogroup Role

3. APG Combobox with aria-readonly on the combobox and listbox Roles

4. APG Listbox with aria-readonly

5. Native checkbox with aria-readonly

6. checkbox Role with aria-readonly

6a. checkbox Role with aria-readonly and Checking Disallowed

Testing `aria-readonly`

1. Uses `aria-readonly` with `radiogroup` Role on a `<fieldset>`

2. Uses `aria-readonly` with `radiogroup` Role

3. APG Combobox with `aria-readonly` on the `combobox` and `listbox` Roles

4. APG Listbox with `aria-readonly`

5. Native checkbox with `aria-readonly`

6. `checkbox` Role with `aria-readonly`

6a. `checkbox` Role with `aria-readonly` and Checking Disallowed