[imperative-slot-api.html]
  [Assigning invalid nodes should be allowed.]
    expected: FAIL

  [Moving a slot to a new host, the slot loses its previously assigned slottables.]
    expected: FAIL

  [Moving a slot's tree order position within a shadow host has no impact on its assigned slottables.]
    expected: FAIL

  [Nodes can be assigned even if slots or nodes aren't in the same tree.]
    expected: FAIL

  [Removing a node from the document does not break manually assigned slot linkage.]
    expected: FAIL