GitHub has recently introduced a new functionality where if you are browsing a page as a guest in one tab and then log in from another tab, the tab where you are still a guest will show a specific message. This feature also functions in incognito or private browsing windows.
Is the client-side compelled to check for existing cookies due to site/session variables?
If you're simply curious about how to implement this, there are straightforward ways to do so. As you mentioned, upon opening the page, the code could check for saved cookies containing a SessionID and verify its validity with the backend. When the page is closed, this SessionID would be cleared and removed from the backend's list. You should be able to connect the dots from here.
Managing cookies with PHP and utilizing javascript for calling it is a practical approach. Best of luck on your implementation!
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