Alert Before Page Close: How to change the Chrome's default message?

Question

I am using the following code snippet to trigger an alert before page closes but Chrome seems to ignore the message and displays its default message \"Do you want to leave t

Answer 1

Update: Deprecated in Chrome : https://developers.google.com/web/updates/2016/04/chrome-51-deprecations?hl=en

Try the following:

window.onbeforeunload = function (e) {
    e = e || window.event;

    // For IE and Firefox prior to version 4
    if (e) {
        e.returnValue = 'A search is in progress, do you really want to stop the search and close the tab?';
    }

    // For Safari
    return 'A search is in progress, do you really want to stop the search and close the tab?';
};

Message I get in Chrome (both custom and default):

A search is in progress, do you really want to stop the search and close the tab?

Are you sure you want to leave this page?

Source jsFiddle