hidden inputs contain non-visual information
<?xml version = "1.0"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
</head>
<body>
<form method = "post" action = "/cgi-bin/formmail">
<p>
<input type = "hidden" name = "recipient" value = "d@d.com" />
<input type = "hidden" name = "subject" value = "Feedback Form" />
<input type = "hidden" name = "redirect" value = "main.html" />
</p>
</form>
</body>
</html>
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