But many, perhaps most, parsers and serializers for CSV are not compliant with RFC 4180. RFC 4180 is not an official standard. The text of the RFC itself state

But many, perhaps most, parsers and serializers for CSV are not compliant with RFC 4180. RFC 4180 is not an official standard. The text of the RFC itself states: > This memo provides information for the Internet community. It does > not specify an Internet standard of any kind. CSVs existed long before that RFC was written, and it is more a description of CSVs that are somewhat portable, not a definitive specification.