Alert onUnload event handler - Show an alert message when a visitor exits your web page.
Compatible Browsers:
Chrome BrowserFirefox BrowserInternet Explorer BrowserOpera BrowserSafari Browser
<html> <head> <title>Alert onUnload event : on page exit alert message</title> </head> <body onUnload="window.alert('Thanks for visiting SnapBuilder.com')"> [ YOUR CONTENT GOES HERE ] </body> </html>