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Third Party Cookies Must Be Removed from the Web Platform


Third-party (AKA cross-site) cookies are harmful to the web, and must be removed from the web platform. This finding explains why they must be removed, and examines the challenges in removing them. We highlight some use cases that depend on third-party cookies and offer some examples of designed-for-purpose technologies that can replace them. Specification authors are expected to ensure they do not undermine the benefits of removing third-party cookies when proposing new web platform technologies.

The TAG calls for all browsers to drop support for third-party cookies, as this provides an opportunity to further improve the privacy preserving features of the web platform. This document sets out some aspects that specification editors and implementors should be aware of in order to make sure we ultimately leave the web better than we found it after third-party cookies are removed. In conclusion, when accommodating changes caused by the deprecation of third-party cookies, we should avoid introducing new technologies that, when deployed either individually or in combination, effectively preserve the status quo of harmful tracking and surveillance on the web.

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