mozilla/mediawiki-skins-gmo — pull request #4 by superawesome (2014-05-01 22:29:27+00:00)
Title: Commenting out "section" CSS definition

This conflicts with WikiEditor, and doesn't seem to be used anywhere?

I think this is cruft left over from previous versions of MediaWiki. In my testing on wiki-dev.allizom.org I haven't noticed any significant changes from disabling this rule, except that WikiEditor looks proper now.