1. 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 unload event (and the onload event).
2. Differences Between HTML 4.01 and HTML5
4. Attribute Values
|script||The script to be run on onunload|