Board Thread:Support Requests - Getting Technical/@comment-25364614-20190725130209/@comment-27958705-20190725152615

it's touchable: Help:CSS and JS customization.

keep in mind: u can't just copy the code from wikipedia and get it working. current version of resourceloader doesn't recognize js syntax above es3. so all those fancy let's and other es-post-3 specific things have to go. also, there is might be some other problems, based on difference between mw 1.19 (here) and mw 1.34 (wikipedia). also #2: there are different editors.