llbacks -->
  <div role="foo Link" data-testname="div[role='foo Link'][tabindex=0], illegal role and capitalized fallback role, has link role" aria-label="x" tabindex="0" data-expectedrole="link" class="ex">x</div>
  <button role="foo Link" data-testname="button[role='foo Link'] with illegal role and capitalized fallback role, has link role" data-expectedrole="link" class="ex"></button>
  <nav role="foo GROUP" data-testname="nav[role='foo GROUP'] with illegal role and all upper case fallback role, has group