[tree-abiding-pseudo-elements.html]
  ["::placeholder" should be a valid selector]
    expected: FAIL

  ["*::placeholder" should be a valid selector]
    expected: FAIL

  ["foo.bar[baz\]::placeholder" should be a valid selector]
    expected: FAIL

  ["::file-selector-button" should be a valid selector]
    expected: FAIL

  ["::file-selector-button:hover" should be a valid selector]
    expected: FAIL

  ["::file-selector-button:focus" should be a valid selector]
    expected: FAIL

  ["::file-selector-button:active" should be a valid selector]
    expected: FAIL

  ["::file-selector-button:is(:hover)" should be a valid selector]
    expected: FAIL

  ["::before::marker" should be a valid selector]
    expected: FAIL

  ["::after::marker" should be a valid selector]
    expected: FAIL