Onion-Location is a HTTP header that web sites can use to advertise their onion counterpart.
If the web site that you're visiting has an onion site available, a purple suggestion pill will prompt at the URL bar saying ".onion available".
Quando tu clicchi su ".onion disponibile", il sito web sarà ricaricato e reindirizzato alla sua parte onion.
In questo momento, Onion-Location è disponibile per Tor Browser desktop (Windows, macOS e GNU/Linux).
You can learn more about Onion-Location in the Tor Browser Manual.
If you're an onion service operator, learn how to configure Onion-Location in your onion site.