CSS property visualization

Good evening,

I finaly finished my CSS property visualization project. It's hosted on
Github at https://github.com/caraya/css-vis and you can see the result on
my website: http://labs.rivendellweb.net/css-vis/css-tree3.html

If you have any suggestions on how to group the properties to make the
display cleaner or how to change the visualization so the text will not
bunch up when there are too many groups open I'd really appreciate it
either here or, ideally, as a pull request in GIthub :-)

Carlos