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Is there a Javascript Event to track the "loss of focus" of the current tab ?
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Use the visibilitychange event to detect if a browser tab has focus or not, e.g. document. addEventListener('visibilitychange', checkTabFocused) . The event is fired at the document when the contents of its tab have become visible or have been hidden. Here is the HTML for the examples in this article.
I would do something with mousemove and scroll and count a visitor as active as long as either of those trigger within some interval. That will also cover them leaving the browser open and leaving the computer.
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