Google Experts Help!..
 

How do they do this? - I have been searching for ages to find out how this works...

You get the box on the top right poop up as soon as you land on the site - I have seen it on other sites as well - It's driving me nuts!....

https://nimbusweb.me/box/attachment/...2-09_30_52.png

I think this is your answer:

https://developers.google.com/identity/sign-in/web

:thumbsup

.

Did someone call CurrentlySober?

what's the purpose of this?

That's what I have been playing with - I can't get it to do that though...

I have no account and never authorized them via Google accounts.....

That pop over is served by Google and is populated with my details already - It lets you offer a complete one click sign up and and log-in solution...

You can't do it with the standard sign in buttons because you don't have any access to the info yet.....

This is not publicly available for everybody.