I couldn't agree more! I've even spending years writing my own css and html editor, just because I want my text editor work like Firebug or dev Tools - allow me

I couldn't agree more! I've even spending years writing my own css and html editor, just because I want my text editor work like Firebug or dev Tools - allow me see real-time results! Well, if you ask me, it's called LIVEditor ;)