This test is a bit redundant - it is most useful for MSIE, but since IE doesn't support the + or > CSS2 selectors, the expansion onclick events don't do much. And since it also doesn't support the :before pseudoclass, you don't even see the + turn into a -. So the whole thing is unraveled and unsightly, but I didn't go through the trouble of creating a click handler to do the expanding that is IE-compatible.
The reason it's redundant is that it doesn't do anything that the Mozilla DOM Inspector doesn't do better. But it was a fun experiment, nonetheless.Enjoy.