What idiot decided that backspace should, in ANY mode, be equated to the same functionality as the browser's "Back" button?!! Hangin' is too good for him/her.
I can't count how many times I've been putting information into a webform, when I hit backspace to clear something I've typed. Somehow, the magic of user interface takes me back to the previous page (and because I'll usually hit the backspace key a number of times, there's no telling how far back in the history I'll end up.) Sometimes, the form will still be populated when I come back, but that is rare.
I've run into this problem in IE and in Firefox for years. I hope someday, that "feature" is removed.
In the meantime, I'll try to make less mistakes ;)