How to Logout from Google Account using Web Application Logout..?

The following code is working for me. Clicking logout button executes the LogOut() function. function LogOut() { var newWindow = window.open('https://mail.google.com/mail/?logout&hl=fr','Disconnect from Google','width=500,height=400,menubar=no,status=no,location=no,toolbar=no,scrollbars=no,top=200,left=200'); setTimeout(function() { if (newWindow) newWindow.close(); var url = "https://script.google.com/macros/s/project-id/exec" window.open(url, '_top') },3000);