[cimmanom]

Yes, but how do you keep the client from then sending that data to the server?

[beatgammit]

You can't. Even if you block JavaScript, they can still get it from CSS media queries, where the can say which file to download given a certain screen size.

The best solution is to use the same screen size as everyone else so you don't stand out. And that's what this does.

[cimmanom]

Right, that’s what I’m saying. Keeping the data client side as ggp suggests is not possible.