Almost nobody turns off JavaScript because it breaks the whole web. You can't even view YouTube. This is less interesting than existing JavaScript techniques t

Almost nobody turns off JavaScript because it breaks the whole web. You can't even view YouTube. This is less interesting than existing JavaScript techniques to identify or filter out crawlers. It works, when the image is not cached, but it's fundamentally inferior to anything you can do with JavaScript, and if you don't have JavaScript at all, I don't see why you would want to care. Just lump that little bit of traffic in with the bots for analytics purposes.