User blog comment:LS11sVaultBoy/GTA Wiki Weekly News - 27th August 2016/@comment-25295528-20160828185635/@comment-5883104-20160901170304

"Custom Javascript enables custom Wikia Rail Modules, to which it requires a template (Template:RandomModule) to display content. The Modules themselves can be modified via JS and CSS, whereas the content within them is edited in the template. Pretty simple, I had expected you would've already known this sort of stuff to be honest."

- That Ferrari Guy

Admittedly I am not particularly good with JavaScript, but I am improving. Thank you to everyone who commented for the information.