Browser tracking through "canvas fingerprinting"

Right, but most games will render directly to the screen, surely? Not to a canvas object which is kept off-screen and only queried from Javascript. So when you create a canvas you should choose (a) an accelerated one, which is fast but you can't later query its contents, or (b) the software-rendered one, which will be pixel-for-pixel the same on all browsers, and can be queried from Javascript, but is slower.