ery HTML element may have a "role" attribute whose value
 must be passed through unmodified on the element on which it
 is declared in the final rendered markup.  The attribute, if
 specified, must have a value that is a string literal that is,
 or an EL Expression that evaluates to, a set of
 space-separated tokens representing the various WAI-ARIA roles
 that the element belongs to.
 </p>
 
 <p class="changed_added_2_2">It is the page author's
 responsibility to ensure that the user agent is capable of
 c