While on other Stack Exchange sites like Game Development and Code Review they recognize if I am logged in to Stack Overflow or Stack Exchange and after refresh request from page I am logged in there too. This autologin feature does not happen on Super User.
Even if I go to the login page, it does not offer me automaticaly to login with my connected SE account.
I know I am registered on Super User as I even asked a question there.
Super User is on its own domain name, superuser.com, not under *.stackexchange.com, therefore the current auto-login does not apply.
What this means right now:
When you log into any Q&A site on the stackexchange.com domain, you will be automatically logged into all other Q&A sites on the stackexchange.com domain + stackexchange.com itself.
- Area 51 is excluded from this.
stackoverflow.com, superuser.com, and other Q&A sites with their own domains will still use the old flow.
Source: Global auth is dead! Long live universal login
Stage 3 will "make cross-domain experience smoother".
