firefox/testing/web-platform/meta/css/css-multicol/parsing/column-pseudo-valid.html.ini

[column-pseudo-valid.html]
  ["::column" should be a valid selector]
    expected: FAIL

  ["::column::scroll-marker" should be a valid selector]
    expected: FAIL

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

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