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Current Selenium servers seem to reset the "implicit" timeout (and maybe others) every time a new page load occurs within a session. This behaviour is counter-intuitive; the specification doesn’t currently define whether/how timeouts should persist. My preference would be for timeouts to be global to the entire session, not reset on a page load, but this seems to go against how servers actually work today.
They are meant to be persistent for the duration of the session. I see this as implicit with the current wording, but specifying it explicitly does no harm I suppose.