Hello everyone!
I am not sure if someone has already reported this bug, but here it is.
An example:
<form method='post' onsubmit='javascript: validateform(this);'>
When you click on "Toggle Plain Text", you can see < b >< /b > getting appended to javascript ! :-/
Some more example threads.
http://www.daniweb.com/forums/thread177790.html
http://www.daniweb.com/forums/thread176123.html
I have tested it on both Firefox and IE7.
Cheers!