I was playing around with this today: Click tracking toy

Just click anywhere on the page. Click a couple times. You won’t see anything immediately – that’s by design. Click update or click reload. You should see some dots where you clicked. Resize the page and hit reload. If my code is working correctly, the dots will reload in the right spots (note: this means if you resize the page and do nothing, the dots will do nothing too).

If you’re using IE, you’re screwed. This page won’t work. in fact, you might get a funky error. The page works in Firefox and I suspect it’ll work in all the Gecko browsers. If it works in any other browsers, cool.