[CSSPseudoElement-selectorText.html]
  [selectorText of pseudo-elements without arguments]
    expected: FAIL

  [selectorText of a sub-pseudo-element only includes its own pseudo-element]
    expected: FAIL

  [selectorText is serialized in lowercase]
    expected: FAIL

  [selectorText of a pseudo-element of a disconnected element]
    expected: FAIL