This works perfectly for me in both Chrome and Safari: <html><body><p>Test</p> <script>window.onbeforeunload = function() { return “Sure?”; }</script> </body></html> When I try to close the window, I get the prompt.
There are some actions which are not working in chrome, inside of the unload event. Alert or confirm boxes are such things. But what is possible (AFAIK): Open popups (with window.open) – but this will just work, if the popup blocker is disabled for your site Return a simple string (in beforeunload event), which triggers … Read more
Because it can’t be done. The new location is private/sensitive information. Nobody wants you to know which sites they visit when they leave your site.