How to differ sessions in browser-tabs?

by

You can use HTML5 SessionStorage (window.sessionStorage). You will generate a random id and save in session Storage per Browser Tab.
Then each browser tab has his own Id.

Data stored using sessionStorage do not persist across browser tabs,
even if two tabs both contain webpages from the same domain origin. In
other words, data inside sessionStorage is confined to not just the
domain and directory of the invoking page, but the browser tab in
which the page is contained in. Contrast that to session cookies,
which do persist data from tab to tab.

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