Testing results and explanation in my post Support for Marking Radio Buttons Required, Invalid.
aria-required
is not allowed on <fieldset>
;required
is not allowed on <fieldset>
;aria-invalid
is not allowed on <fieldset>
;readonly
is not allowed on <fieldset>
;radiogroup
role to use aria-required
, aria-invalid
, or aria-readonly
on <fieldset>
;radiogroup
role is only for cases where only one item in a set can be selected at a time (so not checkboxes);