Prototype Event.StopPropagation for IE >= 8

Question

I understand the proper way to handle event.stopPropagation for IE is

if(event.stopPropagation) {
    event.stopPropagation();
} else {
    event.returnValue = f         


        

Answer 1

Probably this:

Event = Event || window.Event;
Event.prototype.stopPropagation = Event.prototype.stopPropagation || function() {
    this.cancelBubble = true;
}

returnValue = false is an analogue for preventDefault:

Event.prototype.preventDefault = Event.prototype.preventDefault || function () {
    this.returnValue = false;
}