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HTML onunload Attribute

Definition and Usage

The onunload attribute fires once a page has unloaded (or the browser window has been closed).

onunload occurs when the user navigates away from the page (by clicking on a link, submitting a form, closing the browser window, etc.)

Note: If you reload a page, you will also trigger the onunload event (and the onload event).

Applies to

The onunload attribute is part of the Event Attributes, and can be used on the following element:

Elements Event
<body> onunload


Execute a JavaScript when a user unloads the document:

<body onunload="myFunction()">
Try it Yourself »

Browser Support

onunload Yes Yes Yes Yes Yes

Note: Due to different browser settings, this event may not always work as expected.