Thread:TyrantRex/@comment-3360091-20150102192958/@comment-3360091-20150102200738

MediaWiki pages - like Template pages - are special pages. Wikis use a few such as common.js. Don't ask me exactly what it does since I don't know except that it performs JavaScript. You can find MediaWiki pages by searching for "MediaWiki" and selecting "Everything" from the options.

I forgot to add: When creating a CSS page also needs the suffix of ".css" otherwise the wiki won't know what type of page it is.