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The W3C Technical Architecture Group has shattered Google’s proposal to treat multiple domains as the same origin.




Google’s proposal to allow web browsers to treat a group of domains as one for privacy and security reasons was opposed by the W3C Technical Architecture Group (TAG).

Google’s First Party Set (FPS) is related to how web browsers determine whether a cookie or other resource is from the same site or another site you navigated to. .. Browsers may handle these differently. An obvious example is a plan to block third-party cookies.

This proposal groups multiple domains owned by the same entity, such as,, and, into a set that “allows related domain names to be declared as the same first party.” I am proposing that. “”

This idea allows sites to declare their own set using a manifest in a known location. Also, “Browser vendors can maintain a list of domains that meet the UA. [User Agent] Apply the policy and bundle it with your browser. “

This can lead to more application developers creating web apps that target specific browsers and only work (or are limited) in those browsers.

In February 2019, Google software engineer Mike West requested a review of TAG, and feedback on the proposal was released yesterday. “It has been reviewed by TAG and represents a consensus view,” the document states.

According to TAG, “the architectural plank of origin has been relatively stable” for the past decade, despite major changes in web technology. “This proposal is concerned about weakening the notion of origin without considering the full meaning of this action,” he added. The group identified ambiguities in the proposal, such as whether FPS applies to permissions such as access to microphones and cameras.

Google says Chrome doesn’t help ad networks track individuals on the web when third-party cookies toast

Google Chrome’s Engineering Manager said: “No, we don’t suggest changing the scope of permissions. The current scope of FPS is only treated as a privacy boundary where the browser imposes cross-site tracking restrictions.” However, TAG is accurate in FPS. I think it is necessary to describe the range in the proposal.

The second concern is the suggestion that browser vendors will ship their own listings. “This could increase the number of application developers who target specific browsers and create web apps that only work (or are limited) in those browsers, but this is not a desirable result,” TAG said. Says.

The default has a powerful effect, for example, Google ships the market-dominant Chrome browser with a list that and are the same site from a privacy perspective. The user can easily imagine. You want to distinguish between them, but you may not know or know how to change the settings. “First-party sets allow user agents or browsers to approve sites as a set for the benefit of those sites or cookie publishers (such as advertisers), not for the benefit of users,” said TAG. I am.

TAG was particularly concerned about FPS in connection with Google’s individual proposal for a “privacy sandbox.”

The FPS is “trying to redefine what it means to be a third-party cookie,” said TAG, who casts doubt on the “effectiveness of the privacy sandbox.” From Google’s point of view, FPS is listed as one of the components of privacy sandbox technology.

The group also opposed the way FPS “adds complex configuration layers to the web” and mentioned “strong opposition from other implementers” including Mozilla and Apple. For example, Apple’s WebKit reader Maciej Stachowiak added that he was concerned about “malicious claims.”

TAG believes that the first-party set proposal is harmful to the Web in its current form … This proposal undermines the notion of origin and believes that origin is a pillar of the load-bearing structure of the Web architecture. I will. “

The review adds, “This proposal is likely to benefit only strong, large entities that control both implementations and services,” and encourages readers to consider examples of such entities. Finally, TAG warned about requests for new features that are “first-party set dependent” and pointed out that one such feature, the SamePartyCookie, has already been sent for review.

There are some powerful words in this review. It’s also worth noting that the TAG members include the inventor of the Web, Tim Bernes-Lee. Google has already implemented both a first-party set and a SameParty cookie in its current version, Chrome 89, as an “origin trial” to “allow developers to try out new features and provide feedback.” It contains. The trial version of Origin is turned off by default, but it can be enabled by the developer of a particular site after registration or by the user in Chrome settings.

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