On Facebook, when confirming a friend, toggling selected checkboxes in the "How you know this person" overlay results in an incomplete repaint of the very bottom of the little box that appears on toggle. The two that seemed to cause this were "Lived together" and "Through Facebook".
Created attachment 17040 [details] Screenshot - "Through Facebook"
Created attachment 17041 [details] Screenshot - "Lived together"
Created attachment 17049 [details] Reduction
Created attachment 17052 [details] Repaint a block when making children non-inline Not for review yet
Created attachment 17061 [details] Repaint a block when making children non-inline
Comment on attachment 17061 [details] Repaint a block when making children non-inline r=me
Fixed in <http://trac.webkit.org/projects/webkit/changeset/27478>.