How to run a javascript when browser process is killed?

Question

I hav onUnload="cleanup()" defined in my html body tag. The cleanup() method in javascript is

function cleanup() {--clean up session--}.

But when the browser is terminated by killing the process using task manager, I want to do the same action as cleanup. How can this be done?

Answer 1

You cannot. If the process is forcefully killed, nobody cares about your scripts.