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

Detecting Browser or Tab Closures

Identifying if a browser or tab is closing is a common requirement in web development. While detecting such events can be challenging due to browser inconsistencies, there are approaches that can provide a level of detection.

Cross-Browser JavaScript/jQuery Detection

To detect browser or tab closures, one can utilize JavaScript events such as onunload or onbeforeunload. These events are triggered when a window or tab is being closed, even if the user did not click on a link to navigate away.

Drawbacks

However, it's crucial to note that these events also fire when a user navigates away from a page through a link or uses the browser's back button. This poses a limitation in distinguishing between intentional tab/window closures and regular navigation. Therefore, it is currently impossible to detect pure closures natively in JavaScript.

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