Board Thread:Support Requests - Designing Your Wiki/@comment-26923519-20170531172950/@comment-25024589-20170601124226

JustLeafy wrote: I tried it, but the thing is that the white tab indicator doesn't work. See here. My mistake – there's JavaScript involved with it as well.

w:c:sixguns:MediaWiki:Common.js has a script that makes the indicator bar. (It's collapsed in this post because it's fairly long; click the Expand button to see it.) I tested it in my console, and it should work; if not, let me know.