Not sure if this answers that, but: https://webkit.org/blog/8613/intelligent-tracking-prevention-2-1/ https://webkit.org/blog/8613/intelligent-tracking-preventi

Not sure if this answers that, but: https://webkit.org/blog/8613/intelligent-tracking-prevention-2-1/ https://webkit.org/blog/8613/intelligent-tracking-prevention... Cookies can either be set in HTTP responses or through the document.cookie API, the latter sometimes referred to as client-side cookies. With ITP 2.1, all persistent client-side cookies, i.e. persistent cookies created through document.cookie, are capped to a seven day expiry.