Board Thread:Support Requests - Getting Technical/@comment-4059391-20140518033243/@comment-1330470-20140518192944

Well, there's a few pages, such as Mediawiki:Wikia.js, Mediawiki:Monobook.js, Mediawiki:Common.js, where you'd put code. As for how to make code, well, there's whole college courses on that sort of thing. You might be better off copying scripts from dev... lord I barely know how to write the code.

Please note that you do NOT need to have collapsing Javascript installed if you use the non-obsolete form of collapse code.