Board Thread:Support Requests - Designing Your Wiki/@comment-36541110-20200917142257/@comment-9605025-20200917212723

You only need custom JS if you want to do fancy things like the Untertale Wiki does or if you want the custom module to be at the top of the rail. Otherwise, you should be able to use is with just Mediawiki:ImportJS and Template:RailModule. Even if you do need custom JS to achieve what you want, all you have to do to enable it is to staff asking them to enable custom JS for your wiki. But again, that may not be necessary depending on what you want.