I'm not worried about it. Browsers are more fragmented that they've ever been. I'm going to leave the compatibility stuff to library writers like socket.io, p

I'm not worried about it. Browsers are more fragmented that they've ever been. I'm going to leave the compatibility stuff to library writers like socket.io, persistance.js, etc. And when those aren't available or are too complicated, I'm just going to write to the most modern browsers and concede a certain segment of web users (the least valuable, in my opinion), won't be able to use my app.