manual-003.html (355B)
1 <!doctype html> 2 <title>Prompt when beforeunload is canceled</title> 3 <script> 4 addEventListener("beforeunload", 5 function(e) {e.preventDefault()}, 6 false); 7 </script> 8 <p>When clicking the button below, you should get a prompt asking if you want to unload the document</p> 9 <form method="get" action="next.html"> 10 <input type="submit" value="Click here"> 11 </form>