[gary__]

This is great.

I would prefer that browser compatability is mentioned, for my own purposes that would be IE11.

Perhaps set a baseline of what browsers are considered in the intro and then highlight deviance as it occurs.

[andrei_says_]

Suzy grids 2 is an amazing tool for ie11 and everything above it. So I can use one codebase for everything.

Yes, it is float based but my code is at the correct level of abstraction.