The dev tools threw me for a while - the most specific rule said the top border was 1px, but the computed style said 0px. It was only when I disabled all three "display" rules and the border appeared that I noticed the computed display value.
"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer
At work, I'm using IE9 and it shows up there (without compatibility mode).
".45 ACP - because shooting twice is just silly" - JSOP, 2010 - You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010 - When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013