guardian/guss-layout — pull request #15 by sndrs (2014-10-20 17:04:24+00:00)
Title: Add flex-box feature detection support to rows 

Enables optional use of `.has-flex`/`.has-no-flex` type classes to apply styles instead of branching in the Sass.

Primary reason for this is to support FF22 and below (and obviously any other browsers the Sass fork misses).