Earlier quoted context omitted.
> the public suffix list is (sadly) how you communicate that to browsers Sadly, indeed. Had they never heard of DNS?
How would you propose handling this with DNS? Here are some things it covers: * a.example.com and b.example.com are the same site * a.co.uk and b.co.uk are not the same site * a.cloudfront.net and b.cloudfront.net are not the same site * a.higashikawa.hokkaido.jp and b.higashikawa.hokkaido.jp are not the same site * a.example.higashikawa.hokkaido.jp and b.example.higashikawa.hokkaido.jp are the same site There is a p…
_i_am_tld.cloudfront.net IN TXT "yes"
_i_am_tld.higashikawa.hokkaido.jp IN TXT "yes"