Access the example with a new document key for each person accessing the page

[chacha912]

Description:
When multiple users access the profile-stack example page, the number of users does not match the actual number of users who access the document because the document key is the same. Would it be better to access the example page with a new document key?

#38 (comment)
It would be better to issue a new document key. For the same reason, I think liveblocks also issues keys(roomId) for each user.

Why:
In the example below, two users are displayed on the page, but four are displayed in the iframe.

[hackerwins]

I think this can be handled by creating a UUID for each browser, storing it in local storage, and dividing it by key. what do you think?