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beforeunload event listener is a life saver
JavaScript Tutorial For Beginners #41 - Window onLoad Event
Stub the BeforeUnloadEvent.prototype.preventDefault Method
The Page Visibility API in JavaScript, Simplified
JavaScript Tutorial - DOMContentLoaded event | When is it safe to interact with the DOM
HTML : javascript beforeunload detect refresh versus close
JavaScript : Capturing window.onbeforeunload
Learn JavaScript Event Listeners In 18 Minutes
JavaScript : Is it possible to display a custom message in the beforeunload popup
Learn JavaScript KEY EVENTS in 10+ minutes! ⌨
Confirmation before closing of tab browser using javascript
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Last Updated: August 15, 2026
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