[parse-part.html]
  ["::part(foo)::placeholder" should be a valid selector]
    expected: FAIL

  ["::part(foo)::first-line" should be a valid selector]
    expected: FAIL

  ["::part(foo)::first-letter" should be a valid selector]
    expected: FAIL

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

  [":dir(ltr)::part(foo)" should be a valid selector]
    expected: FAIL

  ["::part(foo):lang(en)" should be a valid selector]
    expected: FAIL

  ["::part(foo):dir(ltr)" should be a valid selector]
    expected: FAIL