[namdnay]

> while allowing useful third-party embeds to still operate

the problem is that it breaks third-party embeds that want to provide SSO login, see my other comment. if google had released their "pop-in" suggestion it could have worked

[Vinnl]

Which is what that other example, FedCM, is intended to solve, no?

[namdnay]

yes but that requires working on existing integrations, whereas pop-ins would have "just worked"