This document describes the tracking practices that WebKit believes Web policies should follow and should be blocked by a Web browser by default. Developers believe that these practices are harmful to users because they infringe on the privacy of users but do not allow users to identify, understand, agree or control them.
Apple's anti-tracking mitigation measures in WebKit are generally applicable to all websites, or based on algorithms and device classification. Apple also mentioned that they will create new Web technologies to re-enable specific harmless practices without having to reintroduce tracking.
Due to the new tracking protection strategy, the following features may not work properly in a WebKit-based browser:
Sites that use targeted or personalized ads.
Measure the effectiveness of your ads (ad tracking code).
Use a third-party login provider for federated logins.
Single sign-on to multiple websites controlled by the same organization.
Embedded media, judging user identity to suit their preferences.
"Like" button, joint comment system or other social widgets.
Anti-click fraud and robot detection applications.
Improve the security features of client authentication.
Analytical capabilities and audience data measurements across a single site.