Here is the list of currently allowed HTML tags and attributes for use in the chatterbox.
|a||href, name, target, title|
1Note that <code> and <c> are not really HTML tags at PerlMonks. They prevent enclosed special characters like <, >, &, [, and ] from being interpreted. Also, not even whitespace is allowed inside (< code > will not be recognized) and each must have a matching </code> or </c> for it to work.