3.org/XML/1998/namespace" [Namespaces].
@param namespaceURI The namespace URI of the attribute tocreate. When it is null or an empty string, this method behaves like createAttribute.
@param qualifiedName The qualified name of the attribute toinstantiate.
@return Attr A new Attr object.
@throws DOMException INVALID_CHARACTER_ERR: Raised if the specifiedname contains an invalid character.
@since WD-DOM-Level-2-19990923
L/1998/namespace", if the qualifiedName has a prefix that is "xmlns" and the namespaceURI is different from "http://www.w3.org/2000/xmlns/", or if the qualifiedName is "xmlns" and the namespaceURI is different from "http://www.w3.org/2000/xmlns/".
@since DOM Level 2
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