Personally I think a much better question is why change the box-sizing? Because the default content-box is a pain in the ass to work with, so to be able to use

Personally I think a much better question is why change the box-sizing? Because the default content-box is a pain in the ass to work with, so to be able to use border-box all the time is a good thing: http://www.paulirish.com/2012/box-sizing-border-box-ftw/ http://www.paulirish.com/2012/box-sizing-border-box-ftw/.