[HTMLSlotElement-interface.html]
[assignedNodes() must update when slot elements are inserted or removed]
expected: FAIL
[assignedNodes({"flattened":false}) must update when slot elements are inserted or removed]
expected: FAIL
[assignedNodes({"flattened":true}) must update when slot elements are inserted or removed]
expected: FAIL
[assignedNodes({flatten: true}) must return the distributed nodes, and assignedNodes() and assignedNodes({flatten: false}) must returned the assigned nodes]
expected: FAIL