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Really good point. It would either only make sense on the same origin, or if you authenticated the domain.

How? Who do you trust for the authentication? See SSL certificates, domain name registration, and mail servers for some ideas around how this plays out

It's not that what we have now is perfect, but the use-case of typing in example.com or googling example is indeed a low enough bar that non-technical users get it, and re-tooling everything to support an alternate format is a non-starter. See also: IPv6 adoption, and not many people are typing in or googling IPs.

In terms of authentication I think being able to add a (very specific) piece of content to the site or being able to add a DNS record are two common solutions. I'm not suggesting it's viable in this case though.

IPv6 end-users represent >30% of the traffic hitting some of the services I operate.

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