Archive talk:Wikia's new look - FAQ/@comment-30155-20100817223508/@comment-761251-20100818201926

The worst that can happen is that you add another class to the templates to make them work with both Monaco (assuming it'll still be optionally available) and the new skin; where before you might have had, you'd change it to.

@pcj: it's not about copying style definitions; there are a few classes that are set by Wikia css for the themes, so if you want your on-page widget (infoboxes, notices etc.) to adapt to the theme a user choses, you need to use those classes. See w:c:unanswers.