We've started experimenting with Sass for Wikipedia as well, and it's now in MediaWiki core. Check out mediawiki.ui in the core resources (git.wikimedia.org).

We've started experimenting with Sass for Wikipedia as well, and it's now in MediaWiki core. Check out mediawiki.ui in the core resources (git.wikimedia.org). Right now we're only using it for our upcoming signup/login redesign, but it's available for use elsewhere and will probably start popping up on other interaces. We debated whether to even include the Sass files and associated errata at all though, to be honest.