Breaks this node into two nodes at the specified offset, keeping
both in the tree as siblings.
Throws:
DOMException - INDEX_SIZE_ERR: Raised if the specified offset is negative or greater than the number of 16-bit units in data.
NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
Breaks this node into two nodes at the specified offset, keeping
both in the tree as siblings.
Throws:
DOMException - INDEX_SIZE_ERR: Raised if the specified offset is negative or greater than the number of 16-bit units in data.
NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.