code: function isScrollable(el) {
      var isScrollableY = hasScrollableSpace(el, 'Y') && canOverflow(el, 'Y');
      var isScrollableX = hasScrollableSpace(el, 'X') && canOverflow(el, 'X');
  
      return isScrollableY || isScrollableX;
    }
docs: indicates if an element can be scrolled in either axis
  @method isScrollable
  @param {Node} el
  @param {String} axis
  @returns {Boolean}