There is RFC 4180, which is probably the best formal description of the format we have. My own CSV parsers (I have written a few by now) usually parse that as

There is RFC 4180, which is probably the best formal description of the format we have. My own CSV parsers (I have written a few by now) usually parse that as if the space before (or after) the quote wasn't there. It's nonetheless something to avoid when writing CSV files (Postel's law, etc.).