Beta content

:warning: Not ready for merging!

Just wanted to start this thread up. Still to do:

- [x] Progress graphs
  - [x] IE8 fallback needs some tweaking
- [x] Beta banner
  - [ ] Just needs to incorporate cfpb/cf-expandables#37
- [x] Replace SVG with smaller bitmap images?
Why no `.respond-to-min` use here?