[the-checkmark-pseudo-element.tentative.html]
  ["::checkmark" should be a valid selector]
    expected: FAIL

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

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

  ["::slotted(*)::checkmark" should be a valid selector]
    expected: FAIL

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