I often find that typing in text in some textarea boxes on webpages that the size of the box is too small and I wish I could expand its size like I can with a running GUI program like Notepad or XEmacs. Here is now my experimental attempt of solving that problem. I've only tried it in Firefox (Linux) and Konqueror (Linux) so far. It did not work in Konqueror :(
The obvious risk is that having controls like this will confuse newcomers; and you can't use excessive and intrusive text to explain what these controls do.
Obviously this needs to be couple with some sort of cookie feature so that the desired size is remembered; but that's not the issue here.