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HTML onunload Event Attribute - GeeksforGeeks

HTML onunload Event Attribute

Last Updated : 11 Jul, 2025

The onunload event attribute works when the document is being unloaded i.e. it occurs when the browser has been closed. It is mostly used when the user opens a link and submits the form and closes the browser window. Basically, it is:

Fired when a user navigates away from a page or closes the browser.
Useful for executing cleanup actions or displaying confirmation prompts.
Allows to handle scenarios before the page unloads.

Supported Tags

<body>

Syntax

<element onunload = "script">

Attribute Value

This attribute contains a single value script that works when onunload event is triggered.

Example: In this example, we will see the use of onunload event attribute

HTML


 <!DOCTYPE html>
<html>

<head>
    <title>
        HTML onunload Event Attribute
    </title>
    <script>
        function Geeks() {
            alert("onunload event attribute called");
        }
    </script>
</head>

<body onunload="Geeks()">
    <h1>
        GeeksforGeeks
    </h1>
    <h2>
        onunload Event Attribute
    </h2>
</body>

</html>

Output:

Note: This event may not work always as expected.

Supported Browsers

The browser supported by onunload event attribute are listed below :

Google Chrome 1 and above
Edge 12 and above
Firefox 1 and above
Opera 4 and above
Safari 3 and above

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