newChild to the end of the list of children of this node. If the newChild is already in the tree, it is first removed.
@param newChild The node to add.If it is a DocumentFragment object, the entire contents of the document fragment are moved into the child list of this node
@return The node added.
@exception DOMException HIERARCHY_REQUEST_ERR: Raised if this node is of a type that does not allow children of the type of the newChild node, or if the node to append is one of this node's ancestors or this node itself, or if this node is of type Document and the DOM application attempts to append a second DocumentType or Element node. newChild was created from a different document than the one that created this node. newChild node is a child of the Document node, this exception might be raised if the DOM implementation doesn't support the removal of the DocumentType child or Element child.
@since DOM Level 3
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