function onLoseCapture( tracker, event ) {
        //$.console.log('losecapture ' + (tracker.userData ? tracker.userData.toString() : '') + ' ' + (event.target === tracker.element ? 'tracker.element' : ''));

        var gPoint = {
            id: $.MouseTracker.mousePointerId,
            type: 'mouse'
        };

        var eventInfo = {
            originalEvent: event,
            eventType: 'lostpointercapture',
            pointerType: 'mouse',
            isEmulated: false
        };
        preProcessEvent( tracker, eventInfo );

        if ( event.target === tracker.element ) {
            updatePointerCaptured( tracker, gPoint, false );
        }

        if ( eventInfo.stopPropagation ) {
            $.stopEvent( event );
        }
    }
TODO Never actually seen this event fired, and documentation is tough to find
@private
@inner