Browsers themselves do not. They only do this if the web application itself supports it. For example, there may be some javascript that makes an AJAX request every 30 seconds or so to send a keep-session-alive request to the server, which will then go over and update the status information to reflect that the “most recent activity” now, and therefore prevents the session timeout.
In the above example, however, the “client”, that is, the html / javascript in the browser, and the “server” would be written together and therefore this type of inline function.
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