Maybe someone met such a chat?

Question

Chats

Greetings friends!
If anyone has met a chat with such functionality - throw a link to the source :)
1. Guests can write (without registration, with a nickname like "guest001"), but there is also registration (you can already put a permanent nickname and avatar in it).
2. Chat is located in a separate window on the site.
3. The chat can be scaled and when the cursor is not in the chat, the chat turns into an input bar (collapses).
(if there is only 1 point - it will work too)