No. ITP captures statistics and applies its rules for the effective top-level domain plus one, or eTLD+1. An eTLD is .com or .co.uk so an example of an eTLD+1 would be social.co.uk but not sub.social.co.uk (eTLD+2) or just co.uk (eTLD).
ITP 2.3 counteracts this by downgrading document.referrer to the referrer’s eTLD+1 if the referrer has link decoration and the user was navigated from a classified domain. Say the user is navigated from social.example to website.example and the referrer is https://sub.social.example/some/path/?clickID=0123456789. When social.example’s script on website.example reads document.referrer to retrieve and store the click ID, ITP will make sure only https://social.example is returned.
Does Safari recognize these trackers?
https://webkit.org/blog/8311/intelligent-tracking-prevention...
> Does ITP differentiate between my subdomains?
No. ITP captures statistics and applies its rules for the effective top-level domain plus one, or eTLD+1. An eTLD is .com or .co.uk so an example of an eTLD+1 would be social.co.uk but not sub.social.co.uk (eTLD+2) or just co.uk (eTLD).
https://webkit.org/blog/9521/intelligent-tracking-prevention...
ITP 2.3 counteracts this by downgrading document.referrer to the referrer’s eTLD+1 if the referrer has link decoration and the user was navigated from a classified domain. Say the user is navigated from social.example to website.example and the referrer is https://sub.social.example/some/path/?clickID=0123456789. When social.example’s script on website.example reads document.referrer to retrieve and store the click ID, ITP will make sure only https://social.example is returned.