And to my knowledge you can't ask the browser about the cpu, only the number of cores. The regular fingerprinting you described would be just an user agent string that can be trivially spoofed
I think it overlaps mostly with OS, CPU, Browser, GPU Type, GPU driver version. These can already be queried by UA string and WebGL/WebGPU. It is easier to query them explicitly for most users but I guess canvas fingerprinting is a fallback for when these APIs do not return some of the data.
> And to my knowledge you can't ask the browser about the cpu, only the number of cores.
Generally you can. Not all browsers give up all info, but most browsers give up most of the info. Here is a demo of what you get from ua parsing: https://uaparser.dev/#demo
Those certain math functions happen to be floating point operations that are ordered in a way to maximize the inaccuracy property off floating point types.
These inaccuracies are very correlatable.
The jitter had very little intended effect since accurate system timing can be derived from the instruction processing time of arbitrary javascript code in a mostly browser agnostic way, specifically iteration (i=i+1). It applied broadly to a large number of different types of instructions