I flat-out don’t believe feature usage statistics on the web for this kind of reason, because too many numbers are patently absurdly wrong as far as any kind of

I flat-out don’t believe feature usage statistics on the web for this kind of reason, because too many numbers are patently absurdly wrong as far as any kind of legitimate use is concerned, and so any time I see an element or attribute occurring more often than I’d expect, I just assume some widely-deployed script like Google Analytics that I almost certainly don’t want is using it, probably for fingerprinting.