I tested the Graphics Codex Web Edition back to the following browsers. I test regularly on the latest browser versions and newer ones of course work even better.

Windows
  • Chrome (recommended) 29.0.1547.57
  • Internet Explorer 10.0.9200.16660
  • Firefox 23.0.1
OS X
  • Safari (recommended) 6.0.5
  • Chrome 29.0.1547.57
  • Firefox 23.0.1
Android
  • Chrome (recommended) August 22, 2013 update
  • Dolphin August 5, 2013 update
  • Firefox August 6, 2013 update
iOS
I recommend the native iOS Edition for iPhone, iPad, and iPod Touch. It is faster on those devices and does not require a constant Internet connection.
  • Safari 6.1.3
  • Chrome 28.9.1500.16
Linux
  • Chrome (recommended) 29.0.1547.57
  • Firefox 23.0

The Graphics Codex Web Edition may also work on other web browsers.