From cf3b5be357c7280fb202f898d636aa5c3bd32b41 Mon Sep 17 00:00:00 2001
From: Tab Atkins-Bittner
'left' + 'margin-left' + 'border-left-width' + 'padding-left' + 'width' -\+ 'padding-right' + 'border-right-width' + 'margin-right' + 'right' = width - of containing block
+ + 'padding-right' + 'border-right-width' + 'margin-right' + 'right' = width + of containing block
If all three of 'left', 'width', and 'right' are