Exchanges the current node (in the document tree) with a different node passed as a parameter. The other node object can be created anew, or it can be a reference to a node elsewhere in the document tree. In the latter case, the result is the same as a bi-directional exchange, where the two nodes essentially change places. If the two nodes are of different node types or element display types (e.g., an inline versus a block-level element), the rendering of the document may be affected significantly.