Candidate Set:

            Any element that has the aria-readonly attribute

            Except:

            input elements
            select elements
            textarea elements
            elements with the aria role="columnheader"
            elements with the aria role="rowheader"
            elements with the aria role="grid"
            elements with the aria role="gridcell"
            elements with the aria role="treegrid"
            elements with the aria role="textbox"