[attribute.html]
  [.class selector is effective]
    expected: FAIL

  [[att\] selector is effective]
    expected: FAIL

  [[att|=val\] selector is effective]
    expected: FAIL

  [[att=val\] selector is effective]
    expected: FAIL

  [[att~=val\] selector is effective]
    expected: FAIL

  [#id selector is effective]
    expected: FAIL