Borders

#151515
#392E39
#777777
#A5A7A5
#D3D3D3
#8E9788
#2C649B
#9F6730

I hadn't noticed the differences between these browsers before with rendering rounded corners until I threw a border on them. All browsers shown are Windows versions. The borders are 1 pixel, solid, but are using RGBA so the opacity may be taken into account for rendering differences also.

I was surprised to see Firefox looking the best and surprised that Chrome looked the worst.