else if( window.navigator.msPointerEnabled ) {
            // IE 10 uses prefixed version of pointer events
            revealElement.addEventListener( 'MSPointerDown', this.onPointerDown, false );
            revealElement.addEventListener( 'MSPointerMove', this.onPointerMove, false );
            revealElement.addEventListener( 'MSPointerUp', this.onPointerUp, false );