Like pretty much everyone else who's doing something similar I was inspired by https://coderwall.com/p/lhsrcq
Everything typed is put into localStorage and appcache is used to make it available offline.
Webfonts used are free from Font Squirrel http://www.fontsquirrel.com/
If you want a really good writing experience consider purchasing IA Writer http://www.iawriter.com/
- Add buttons to change font-size