302201 - Closing the window with ALT+F4 can be canceled by script

Status: NEW

(Core :: DOM: UI Events & Focus Handling, defect)

Description

[Daniel Kirsch]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; de-DE; rv:1.7.8) Gecko/20050511 Firefox/1.0.4
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; de-DE; rv:1.7.8) Gecko/20050511 Firefox/1.0.4

When using the following JavaScript I can cancel ALT+F4 to close the window.

document.onkeydown = function(e) {
  e = e||window.event;
  if (e && e.altKey && e.keyCode == 115) {
    alert("no");
    return false;
  }
};

IMHO closing the application should not be canceable by script.

Reproducible: Always

Steps to Reproduce:

Comment 1

[José Jeria]

IE also shows the alert, but after you dismiss the alert, its closed

Comment 2

[Daniel Kirsch]

Yes. In this case that's exactly what I expect. This way, I'm able to show a
last message. We use it in some learning applications and browser based software
simulations.

Comment 3

[Jorge Villalobos [:jorgev] (he/him)]

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8b4) Gecko/20050726
Firefox/1.0+ ID:2005072606
I can confirm

Comment 4

[Dirk Sohler]

I can confirm this bug, too.

Mozilla/5.0 (Windows; U; Windows NT 5.1; de-DE; rv:1.7.10) Gecko/20050717
Firefox/1.0.6

Comment 5

[Wayne Mery (:wsmwk)]

do you still see this problem? please update the bug with comment and/or close as appropriate.

(bug has no comment since 2007-01-01)

Comment 6

[Jorge Villalobos [:jorgev] (he/him)]

I can still reproduce this bug on
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1) Gecko/20090624 Firefox/3.5

-> NEW

Comment 7

[Masayuki Nakano [:masayuki] (he/him)(JST, +0900)]

I don't think this is a bug. How about you, smaug?