code: function hasScrollableSpace(el, axis) {
      if (axis === 'Y') {
        return el.clientHeight + ROUNDING_TOLERANCE < el.scrollHeight;
      }
  
      if (axis === 'X') {
        return el.clientWidth + ROUNDING_TOLERANCE < el.scrollWidth;
      }
    }
docs: indicates if an element has scrollable space in the provided axis
  @method hasScrollableSpace
  @param {Node} el
  @param {String} axis
  @returns {Boolean}