The only HTML code that I know works is "ampersand nbsp semi-colon" which leaves a blank line, if it's the only thing on it. It also can be used to force a blank space between characters.
I've not tried too many other escape sequences, but I also know that ALT codes work in many cases: List of ALT Codes -
http://www.tedmontgomery.com/tutorial/ALTchrc.html
Some HTML code CAN be used for your profile, though: See
http://www.orangefrogproductions.com...
Oh... The answer to which you referred was created and entered by the AB staff. Remember, they OWN the site, so can do anything they wish to it. ;-)