Atomic CSS was used on Yahoo sites, since the Marissa Meyer level. Apparently on a few of their properties. Hard to assess whether it was a failure or not. Cons

Atomic CSS was used on Yahoo sites, since the Marissa Meyer level. Apparently on a few of their properties. Hard to assess whether it was a failure or not. Considering their websites were a negative asset, I doubt the use of Atomic CSS was a major component of that, there were definitely bigger problems.