Most of CGI.pm's methods are built on-the-fly. There should be some boilerplate code that is used to build the methods. But, having looked at CGI source (which someone described as "like snorting helium"), I assert that it is often not a great route to understanding (and I'm a big proponent of reading the source code so I encourage you to plow forward but more as a way to learn some strange things about Perl rather than as a way of understanding how to use CGI.pm).

I suggest you post the Perl code you are using and exactly what you don't like about the HTML it produces (probably including an example of exactly what you wanted).