Board Thread:Support Requests - Designing Your Wiki/@comment-8190200-20130731081509/@comment-1330470-20130731081606

Perhaps you're talking about c:dev:UserTags?

Edit: Okay maybe yeah you knew that =\ You can put it in Mediawiki:wikia.js, and it'll only affect Wikia skin. But Mediawiki:Common.js is better, 'cause it also affects Monobook skin.