insert
Inserts the given node before the given beforeNode as a child of the current node. The new node can be an existing node in the document, or you can create and insert a new node. If the node is existing node, it will be moved to a new location in the document.
Return
true if the given node was successfully inserted
Parameters
node
the node to insert
before
the node before which the node will be inserted
Throws
when this node is closed