p class="changed_added_2_2">Per the WAI-ARIA spec and its
 relationship to HTML5 (Section title ARIA Role Attriubute),
 every 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.
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