Thread:Talk:Requests for comment/Scoping site CSS/Why Less?/reply

You could get round this by pre-parsing MediaWiki:Common.css and then wrapping it. The first example would then throw a LESS compiler error. I don't think the 2nd example is much of a problem. There is a limit to the sort of things you can do with this kind of selector. People should be able to do those if they really want.

It seems that there is interest (below) in splitting Common.css into Content.css and UI.css to make where rules apply more explicit.