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Calling insertBefore on Attributes

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If the current node is an attribute, 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_COMMENT, NODE_DOCUMENT, NODE_DOCUMENT_TYPE, NODE_ELEMENT, NODE_ENTITY, NODE_NOTATION, NODE_PROCESSING_INSTRUCTION Returns an error. These node types cannot be children of an attribute.
NODE_DOCUMENT_FRAGMENT Inserts the children of the document fragment (newChild) and returns newChild.
NODE_ENTITY_REFERENCE, NODE_TEXT Inserts newChild and returns newChild.
NODE_CDATA_SECTION, NODE_COMMENT, NODE_ENTITY, NODE_NOTATION, NODE_PROCESSING_INSTRUCTION, NODE_TEXT Returns an error. These node types either cannot have children or their children are read-only.

Remarks

If an entity reference is added to an attribute, the namespace and the prefix of the entity reference are added to the element containing the attribute.