Back Story:
Hi. I am in the design process of my upcoming personal website. I want to use a lot of modern CSS techniques to add polish, but at the same time I require it to be accessible.
Now, I know how Transitions gracefully degrade, but Just yesterday I stumbled across the CSS Layout Grid (slated for full support w/ modern browsers once IE10 comes out).
The problem is, the w3c draft doesn't clarify anything about how it degrades:

The Actual Question:

Does anyone have any working experience with the CSS grid?
How exactly does this degrade?
Is it backwards compatible?