ReadonlydescribedSpace-separated ids for aria-describedby (help text, plus the error when invalid).
ReadonlyidThe control's id; the Field's label points at it.
ReadonlyinvalidWhether the Field is currently invalid; render as aria-invalid.
ReadonlyrequiredWhether the Field is required; render as required.
Attributes a custom control should render to join the enclosing Field.