Re: [w3ctag/design-reviews] Review request for Fenced Frames (Issue #735)

Thanks again for requesting a review. We're happy with the goals of this work, and think it will be a positive addition to the web platform in the absence of third-party cookies.

We have general concerns about negative impacts if/when it is implemented before third-party cookies are completely phased out. We also remain concerned about how the threat model is changed (eg. introducing new side-channels) when it is used in combination with other work that is emerging to meet use cases which previously needed third-party cookies, in particular the other work coming out of the Privacy Sandbox initiative. We look forward to your ongoing work on ensuring Fenced Frames is sufficiently secure and privacy preserving in the context of the wider ecosystem, and will appreciate another review request when the work has progressed further and with input from other stakeholders.

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