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

> For what’s worth, I’d also be interested to learn about the risks of fenced frames prior to the removal ot third-party cookies. One risk I can imagine is the false sense of isolastion — that the developer/user may think that something is tight, but it maybe isn’t. Is that the raised problem here?

@lknik agree that there are existing leaks in FFs, some of them mentioned in the explainer [here](https://github.com/WICG/fenced-frame/tree/master/explainer#ongoing-technical-constraints). To the user, FFs currently do not show any UX difference and since they are strictly better than iframes with 3pc, I think that would be ok. To developers, we could likely clarify the existing documentation enumerating the existing leaks. Would that help? 

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