Mac OS X/Linux/Unix
Firefox 0.7+ , Camino 0.9+ , Netscape 7.1+ , Mozilla 1.4+ , or any browser based on Mozilla 1.4+

Mac OS X/Linux/Unix
Any browser based on Mozilla 1.3+, some browsers are hard to find because none of the major browser vendors support these operating systems anymore, however you can find one here: http://www.wamcom.org

Full support for Apple Safari 3.0 and above (and possibly other browsers based on Apple WebKit build 522 and above)

What happens if I use an unsupported browser?
A regular textarea will be displayed instead, so you can still edit content an old fashioned way.