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This adds `compareDocumentPosition(otherNode)` to fragment instances. The semantics implemented are meant to match typical element positioning, with some fragment specifics. See the unit tests for all expectations. - An element preceding a fragment is `Node.DOCUMENT_POSITION_PRECEDING` - An element after a fragment is `Node.DOCUMENT_POSITION_FOLLOWING` - An element containing the fragment is `Node.DOCUMENT_POSITION_PRECEDING` and `Node.DOCUMENT_POSITION_CONTAINING` - An element within the fragment is `Node.DOCUMENT_POSITION_CONTAINED_BY` - An element compared against an empty fragment will result in `Node.DOCUMENT_POSITION_DISCONNECTED` and `Node.DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC` Since we assume a fragment instances target children are DOM siblings and we want to compare the full fragment as a pseudo container, we can compare against the first target child outside of handling the special cases (empty fragments and contained elements).