[hidden-ua-stylesheet.html]
  [div.removeAttribute('hidden')]
    expected: FAIL

  [div.setAttribute('hidden', '')]
    expected: FAIL

  [div.setAttribute('hidden', 'asdf')]
    expected: FAIL

  [div.setAttribute('hidden', 'until-found')]
    expected: FAIL

  [div.setAttribute('hidden', 'UNTIL-FOUND')]
    expected: FAIL

  [div.setAttribute('hidden', 'UnTiL-FoUnD')]
    expected: FAIL

  [div.setAttribute('hidden', '0')]
    expected: FAIL