I remember back when people generated html with native code using CGI.pm and it was considered a bad idea. Don't mix languages they said. The current CGI.pm deprecated all of the HTML generating parts in fact.

The official justification:

  The rationale for this is that the HTML generation functions of CGI.pm are an obfuscation at best and a maintenance nightmare at worst. You should be using a template engine for better separation of concerns. See CGI::Alternatives for an example of using CGI.pm with the Template::Toolkit module.