 role" aria-label="x" data-expectedrole="group" class="ex">x</nav>
  <div role="foo ReGiOn" data-testname="div[role='foo ReGiOn'][aria-label] with illegal role and alternating case fallback role, has region role" aria-label="x" data-expectedrole="region" class="ex">x</div>
  <div role="ReGiOn foo" data-testname="div[role='ReGiOn foo'] with alternating case role and illegal fallback role without accname, has generic role" class="ex-generic">x</div>
  <div role="ReGiOn foo" data-testname="div[role='ReGiOn foo