> Safari’s Intelligent Tracking Prevention managed to mitigate all third-party cookies to a tracking domain, apart from redirects. However, we found that future completeness can be undermined by having this option disabled for even a short interval. Third-party cookies set in this interval by tracking domains, which otherwise would have been prevented, will still be included in cross-site requests after enabling the option again, identical to the results when the option is disabled. Luckily, this option is enabled by default, so future completeness can only be affected through explicit disabling by the user.
I'd also like to know whether that applies to iOS, but the paper didn't perform any mobile browser testing.
That said, every so often I view my stored cookies and I'm always shocked at the number of domains that I've never heard of that have stashed cookies. :-(