The demo doesn't work in safari on my mac. It sometimes gets to 2, but on refresh goes back to 1. Actually, got it up to 4 one time. Seems like the claims of "Works in any browser and any server" are overstated.
same. I got it up to 8 by clicking into the address bar and hitting enter. However, doing a refresh instead caused it to reset (the browser didn't send the if-modified-since header so the server didn't do it's little trick and instead started over)