and known ARIA 1.1 with 1.0 role backup -->
  <div role="switch checkbox" aria-checked="true" data-testname="aria 1.1 switch role w/ fallback to aria 1.0 checkbox role" aria-label="x" data-expectedrole="switch" class="ex">x</div>

  <!-- known el and invalid role token with valid backup -->
  <div role="foo button" data-testname="div[role=button] ignoring invalid foo role token" aria-label="x" data-expectedrole="button" class="ex">x</div>

  <!-- unknown el and invalid role token with valid backup -->
  <un