User blog comment:Ohmyn0/Chat is Now in Wikia Labs/@comment-3080486-20110702060811/@comment-1997905-20110702152555

HTML does not work in messages. The server will strip all tags and leave just text. Every  is replaced with , which you see as a   but will not affect HTML. The only code that works in chat is normal wikitext links. It is possible to change the chat CSS and JS, that's how my chat hacks work. However, it's quite likely that changing chat's CSS or JS wiki-wide is a ToU violation.