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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.

Our research has found that trackers, instead of decorating the link of the destination page, decorate their own referrer URL and read the tracking ID through document.referrer on the destination page. By limiting the ability to use any script-writeable storage for cross-site tracking purposes, ITP 2.3 makes sure that third-party scripts cannot leverage the storage powers they have gained over all these websites. Now those scripts are being repurposed to circumvent browsers’ protections against third-party tracking. Site owners have been convinced to deploy third-party scripts on their websites for years. The reason why we cap the lifetime of script-writable storage is simple. Put differently, ITP 2.3 caps the lifetime of all script-writeable website data after a navigation with link decoration from a classified domain. Together with ITP’s capped expiry of client-side cookies, this change removes trackers’ ability to use link decoration combined with long-term first-party website data storage to track users.

After seven days of Safari use without the user interacting with a webpage on website.example, all of website.example’s non-cookie website data is deleted.

website.example will be marked for non-cookie website data deletion if the user is navigated from a domain classified with cross-site tracking capabilities to a final URL with a query string and/or a fragment identifier, such as website.example?clickID=0123456789.

ITP 2.3 counteracts this in the following way: Since ITP 2.2, several trackers have announced their move from first-party cookies to alternate first-party storage such as LocalStorage.

Capped Lifetime For All Script-Writeable Website Data Unfortunately, we see continued abuse of link decoration, so ITP 2.3 takes two new steps to combat this. With ITP 2.2, when a webpage is navigated to from a domain classified by ITP and the landing URL has a query string or fragment, the expiry of persistent client-side cookies created on that page is 24 hours. Our previous release, ITP 2.2, focused specifically on the abuse of so-called link decoration for the purposes of cross-site tracking. Enhanced Prevention of Tracking Via Link Decoration Intelligent Tracking Prevention (ITP) version 2.3 is included in Safari on iOS 13, the iPadOS beta, and Safari 13 on macOS for Catalina, Mojave, and High Sierra. Note: Read about past updates to this technology in other blog posts about Intelligent Tracking Prevention, the Storage Access API, and ITP Debug Mode.