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HTML | onbeforeunload Event Attribute

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  • Difficulty Level : Basic
  • Last Updated : 16 Aug, 2022
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The onbeforeunload event run when the document is about to be unloaded. This event is used to allow to display a message in a dialog box to inform the user to he/she wants to stay or leave the current page.
Supported Tags 

  • <body>


<element onbeforeunload = "script">

Attribute Value: This attribute contains single value script and it runs when onbeforeunload event called. This event attribute is supported by <body> tag.


<!DOCTYPE html>
        <title>onbeforeunload attribute</title>
            body {
            h1 {
            a {
    <body onbeforeunload="return myFunction()">
        <h2>onbeforeunload attribute</h2>  
        <a href="">Go to GeeksforGeeks</a>
        function myFunction() {
            return "This document is ready to load";


Supported Browsers: The browser supported by onbeforeunload attribute are listed below: 

  • Google Chrome 1
  • Edge 12
  • Internet Explorer 4
  • Firefox 1
  • Safari 3
  • Opera 12


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