What is the content preservation mechanism of the answer box?

Answer questions every time the answer box loses focus, it triggers an event to send a request to the server to save the current input
Change the machine and the browser to get it here.
But the cache is erased.
Is it because it's _xsrf this cookie to get the data
_XSRF recorded the session?

Reply content:

Answer questions every time the answer box loses focus, it triggers an event to send a request to the server to save the current input
Change the machine and the browser to get it here.
But the cache is erased.
Is it because it's _xsrf this cookie to get the data
_XSRF recorded the session?

SESSION_ID is the premise, the browser's session is marked

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