ndler, true);
        // Older, non-standard `mousewheel` event for some FF:
        document.addEventListener('mousewheel', this._scrollInteractionHandler, true);
        // IE:
        document.addEventListener('DOMMouseScroll', this._scrollInteractionHandler, true);
        // Mobile devices can scroll on touch move:
        document.addEventListener('touchmove', this._scrollInteractionHandler, true);
        // Capture keydown to prevent scrolling keys (pageup, pagedown etc.)
        document.addEventLi