[timdorr]

It's all open source and in the public domain: https://github.com/18F/web-design-standards

They're also pretty active with the pull request system: https://github.com/18F/web-design-standards/pulls and have a CONTRIBUTING guide: https://github.com/18F/web-design-standards/blob/18f-pages-s...

I attended a presentation by one of the people working on the project last week and they put a lot of thought into both how to make this a usable guide for now and how to keep it growing into the future. The USDS has attracted some really great people lately, and it shows!