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How can that be? If 100 users buy a specific MacBook or ThinkPad they have identical hardware. Or do different revisions of the same chip have different rendering? Windows and browsers force updates at about the same schedule on everyone.

I'd expect it to narrow you down to hardware/OS, perhaps driver (though most users use whatever Windows or the OEM throws at them). How can it do more?

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100 users buy the same hardware but decided to resize their browser window slightly differently. Bravo, window.outerHeight and window.outerWidth.

100 users buy the same hardware but some decided to install some custom font they need. Bravo there’s a difference now.

GP is very clear that there’s no single magical API used for fingerprinting. It’s anything and everything.

What?

If 2 people buy a new MacBook and run a WebGL or Canvas fingerprint, why would they have different results?

I do not believe it is unique at all. It will be unique for a hardware-OS-driver-browser combo. And if you are not doing anything strange, those numbers will be pretty common (most users just use whatever OS/driver package ships, and the browser gets upgraded like everyone else).

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