HTML onunload Event 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).
Note: Due to different browser settings, this event may not always work as expected.
Differences Between HTML 4.01 and HTML5
|script||The script to be run on onunload|
HTML Event Attributes