We’d like to again thank Google for initiating this analysis through their report. Full third-party cookie blocking makes sure there’s no ITP state that can be detected through cookie blocking behavior. As discussed in our December 2019 blog post, the internal state of tracking prevention could be turned into a tracking vector. Removes Statefulness From Cookie Blockingįull third-party cookie blocking removes statefulness in cookie blocking. We will report on our experiences of full third-party cookie blocking to the privacy groups in W3C to help other browsers take the leap. We know Chrome wants this behavior too and they announced that they’ll be shipping it by 2022.
As far as we know, only the Tor Browser has featured full third-party cookie blocking by default before Safari, but Brave just has a few exceptions left in its blocking so in practice they are in the same good place. Safari continues to pave the way for privacy on the web, this time as the first mainstream browser to fully block third-party cookies by default. Regardless of the size of this change, there are further benefits, as explored below.
It is going through the standards process in the W3C Privacy Community Group right now. To keep supporting cross-site integration, we shipped the Storage Access API two years ago to provide the means for authenticated embeds to get cookie access with mandatory user control.
But we’ve added so many restrictions to ITP since its initial release in 2017 that we are now at a place where most third-party cookies are already blocked in Safari. It might seem like a bigger change than it is. This is a significant improvement for privacy since it removes any sense of exceptions or “a little bit of cross-site tracking is allowed.” Full Third-Party Cookie BlockingĬookies for cross-site resources are now blocked by default across the board. This blog post covers several enhancements to Intelligent Tracking Prevention (ITP) in iOS and iPadOS 13.4 and Safari 13.1 on macOS to address our latest discoveries in the industry around tracking.
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