User blog comment:Dopp/Technical Update: January 10, 2012/@comment-1025281-20120111113249/@comment-188432-20120111153556

It's not just section headers that got an overnight top margin. Bulleted lists also now have more vertical distance between points. Don't know whether that's because a top or bottom margin has been added, or if it's because the line-height for bulleted lists is handled through a different element than that for general article text. In any event, our disambiguation pages are ugly as hell now at w:c:tardis.

Oh, and tables of content seem to have additional line-height as well.