Can't enter text in input field, and sometimes safari is crashing (Demo example)

on the demo ( it’s not possible to enter text (username/password on the login screen) on iOS7 + Ipad. At some point (when trying a lot) the browser also crashes. It’s not related at codepen itself (i.e. all the other libraries there), I can reproduce the issue locally.

The issue is the same on a real iPad like on the iOS Simulator.

I have also opened yesterday an issue on GitHub ( feel free to remove one or the other if that’s redundant.