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JavaScript : Capturing window.onbeforeunload
JavaScript #19: события при загрузке - DOMContentLoaded, load, unload, beforeunload, readyState
JavaScript Event {object} a beforeunload
JavaScript Tutorial For Beginners #41 - Window onLoad Event
JavaScript Event Capture, Propagation and Bubbling - #JavaScript30 25/30
JavaScript : Is it possible to display a custom message in the beforeunload popup
How to Create a Custom Alert on Window Close with OK and Cancel Options using JavaScript
Stub the BeforeUnloadEvent.prototype.preventDefault Method
Beforeunload event listener is a life saver
How to Delete a localStorage Item When the Browser Window/Tab is Closed
JavaScript Tutorial - DOMContentLoaded event | When is it safe to interact with the DOM
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Last Updated: August 13, 2026
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