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False: it is possible with just CSS [1][2] to track screen resolution, browser engine, fonts, mouse movements and inputs.

Both those methods rely on the browser not prefetching certain resources, which they are absolutely allowed to prefetch.

So if a browser changes the prefetching algo, the method is immediately broken. (For example enabling network.predictor.enable-prefetch in Firefox).

It isn't an inherent weakness of CSS itself.