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insertBefore(newChild [, refChild] )
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Parameters
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Node newChild
The node to insert.
Node refChild
[optional] The reference node, i.e., the node before which the new node must be inserted.
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Returns
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Node. The node being inserted.
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Throws
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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 insert is one of this node's ancestors.
WRONG_DOCUMENT_ERR: Raised if newChild was created from a different document than the one that created this node.
NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly or if the parent of the node being inserted is readonly.
NOT_FOUND_ERR: Raised if refChild is not a child of this node.
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