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Tangentially, but you might also be interested in evercookie (http://samy.pl/evercookie/ http://samy.pl/evercookie/) which exploits the fact that browsers have
by politician 15y ago
Tangentially, but you might also be interested in evercookie (http://samy.pl/evercookie/ http://samy.pl/evercookie/) which exploits the fact that browsers have made clearing cookies, localStorage, and a few other things into separate tasks, so the probability of users correctly clearing everything is low.
(caution: dark side points)