Apple Safari has an on-by-default privacy protection feature called Intelligent Tracking Protection, or ITP. ITP has been very effective in preventing cross-site tracking by disabling 3rd-party cookies completely and capping the lifetime of all script-writable website data.
By default, Fingerprint API uses 3rd party cookies (both client-side set with
document.cookie and server-side set with the
Set-Cookie HTTP header) and script-writable website data (localStorage) to more reliably identify returning visitors. All of these methods are affected by ITP, lowering identification accuracy.
Updated about 2 months ago