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If the current node is a document, calling insertBefore has the following results, depending on the value of the newChild parameter.
| Node type passed in newChild | Result |
|---|---|
NODE_ATTRIBUTE, NODE_CDATA_SECTION, NODE_DOCUMENT, NODE_ENTITY, NODE_ENTITY_REFERENCE, NODE_NOTATION, NODE_TEXT |
Returns an error. These nodes are not valid as children of a document node. |
NODE_COMMENT, NODE_PROCESSING_INSTRUCTION |
Inserts newChild and returns newChild. |
NODE_ELEMENT |
Inserts newChild and returns newChild. By definition, an XML document (the Document node) can have only a single child. Therefore, an error is returned if the Document node already has a child. |
NODE_DOCUMENT_FRAGMENT |
Inserts the children of the document fragment (in newChild) and returns newChild. The insert operations are subject to the rules for child nodes and can fail if the document fragment children represent node types that cannot be inserted. |
NODE_DOCUMENT_TYPE |
Returns an error. The document type is read-only. |