Doing ajax example in iteration F2, reloaded page & click add to cart. Ajax works in chrome, FF, but not in IE 8.0.76 (does a reload instead). My application.html.erb uses <!DOCTYPE html> as Troubleshooting suggested.
It should work with IE. Feel free to file a bug report with Rails should you experience otherwise.
I’m traveling at the moment, but will verify this myself early next week. If I can get it to fail and nobody beats me to the bug report, I’ll file one myself.