How to detect the dragleave event in Firefox when dragging outside the window

Question

Firefox doesn\'t properly trigger the dragleave event when dragging outside of the window:

https://bugzilla.mozilla.org/show_bug.cgi?id=665704

https://bugzil

Answer 1

addEvent(document, "mouseout", function(e) {
    e = e ? e : window.event;
    var from = e.relatedTarget || e.toElement;
    if (!from || from.nodeName == "HTML") {
        // stop your drag event here
        // for now we can just use an alert
        alert("left window");
    }
});

This is copied from How can I detect when the mouse leaves the window?. addEvent is just crossbrowser addEventListener.