Eclipse...... I have not used this for HTML5, but might be worth a look. It is free.

http://blog.webagesolutions.com/archives/419


>Until I make my VS 2012 stable (ok, it must be my computer problem) I need an IDE to "play" with HTML5, jQuery, and other Javascript tools. Any recommendations of a simple, stable, and free HTML5/Javascript IDE?
>
>TIA.
>
>P.S. Please don't recommend a Notepad <g>.