[CSS-supports-details-content-pseudo-parsing.html]
  [selector() function accepts ::details-content]
    expected: FAIL

  [selector() function accepts ::details-content followed by ::before]
    expected: FAIL

  [selector() function accepts ::details-content followed by ::first-line]
    expected: FAIL

  [selector() function accepts ::details-content followed by a state pseudo-class]
    expected: FAIL

  [selector() function accepts ::details-content followed by :lang()]
    expected: FAIL