[jraph]

Most browsers use the Mozilla public suffix list [1] that is frequently updated, and a new service can easily submit a new entry. This list is used for many different features.

This list is necessary anyway, because you have top level domains that look like .co.uk, so you can't just split the domain name by dots and take the last component to determine the top level domain.

So, not saying I unconditionally like the fact they are hiding important information in the URL bar, but I would not say their default behavior is that broken.

[1] https://publicsuffix.org - probably the list being mentioned in the video linked by the parent commenter, I guess

[ubercow13]

This list seems to be actually used to determine how cookies can be shared across domains, but not by Safari? Does this mean that Safari might have different behaviour as to when cookies can be shared across domains?