The jsfiddle style looks good, but how does that work with multiple files on the page? Do you select the files you want to work with? Not sure if it's possible

The jsfiddle style looks good, but how does that work with multiple files on the page? Do you select the files you want to work with? Not sure if it's possible, but I think it'd be cool to highlight which lines have been live edited. One bit of feedback about editing CSS: it'd be great if, when editing a property, using the arrow keys cycled through the default properties. I.e. border-style goes through solid, dotted, none, etc. Looking great!