How Can I Reliably Detect Browser or Tab Closure in JavaScript?

Detecting Browser or Tab Closure

Challenge

Determining if a browser or a particular tab is closing without the user actively clicking a link can be a complex task.

Event-Based Detection

Despite the common misconception, events like onunload and onbeforeunload aren't exclusive to closure detection. They also trigger when navigating away from a page via a link or using the browser's back button.

Lack of Native Cross-Browser Detection

Unfortunately, there is no standard cross-browser JavaScript or jQuery solution that can unequivocally distinguish between closure and non-closure events. The specified events are triggered in both scenarios.

Therefore, using any of these events in JavaScript alone won't provide a viable method for purely detecting a closure event.

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