[attr-pseudo-element-originating.html]
  [::part() attr() resolves on shadow host]
    expected: FAIL

  [::part() attr() with percentage type resolves on shadow host]
    expected: FAIL

  [::part() attr() invalidation on host attribute change]
    expected: FAIL

  [::part() attr() resolves on the originating host across exportparts]
    expected: FAIL

  [::part() attr() invalidation across exportparts]
    expected: FAIL