Prevents propagation of an event beyond the current target.
Returns S_OK if successful, or an error value otherwise.
You can stop event propagation in the capturing or bubbling event phase by calling the stopPropagation method. However, the event dispatchs to all event listeners on the current target (regardless of capturing or bubbling) before the event flow stops. To completely prevent any remaining handlers from running, use the IDOMEvent::stopImmediatePropagation method instead.
The stopPropagation method is similar to the IHTMLEventObj::cancelBubble event property of Internet Explorer 8 and earlier versions.