Can Not Edit ToDo with Keyboard

While playing around with the AngularJS todo application ( http://dylanb.github.io/todomvc/index.html#/ )
I as not able to edit a todo. The page says I can click on a todo to edit it's content, but can't do the same function with a keyboard.

I was using the following operating system and browsers:

Window 7

Firefox - 47.0
IE - 11.0.9
Chrome - 51.0.2
