If your users are simply submitting text to appear on a message board or in a guestbook, you may well want to make sure there's no HTML in the text. And if they include JavaScript, it could be far worse. It's a good idea to run some sort of validation on the server side too, in the CGI script that's getting the input. If your form or form fields happen to share a name with one of these words, JavaScript will choke and give you a baffling error message. If you're lucky, they'll be covered in an upcoming tutorial.
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