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Dear #yggdrasil service owners: do *not* merely add an Yggdrasil IPv6 address to your existing https website. It will always fail due to certificate mismatch and you can't get DV cert on Yggdrasil address.
Do create a HTTP-only mirror on Yggdrasil IPv6 or dedicated hostname - Yggdrasil already provides transport encryption so TLS is to some extent redundant.
So:
https://webcookies.pub (IPv4+IPv6)
http://y.webcookies.pub (Yggdrasil)
DV (domain-validated) TLS authenticates your hostname.
Yggdrasil address is your public key so this is somewhat comparable to DV.
If you use FQDN that maps to Yggdrasil IPv6 then it's not authenticated though, unless you use DNSSEC as well.