code: function refreshScrollbarHandleLength(isHorizontal) {
                      var handleCSS = {};
                      var scrollbarVars = getScrollbarVars(isHorizontal);
                      var scrollbarVarsInfo = scrollbarVars._info;
                      var digit = 1000000;
                      //get and apply intended handle length
                      var handleRatio = MATH.min(1, (_hostSizeCache[scrollbarVars._w_h] - (_paddingAbsoluteCache ? (isHorizontal ? _paddingX : _paddingY) : 0)) / _contentScrollSizeCache[scrollbarVars._w_h]);
                      handleCSS[scrollbarVars._width_height] = (MATH.floor(handleRatio * 100 * digit) / digit) + "%"; //the last * digit / digit is for flooring to the 4th digit
  
                      if (!nativeOverlayScrollbarsAreActive())
                          scrollbarVars._handle.css(handleCSS);
  
                      //measure the handle length to respect min & max length
                      scrollbarVarsInfo._handleLength = scrollbarVars._handle[0]['offset' + scrollbarVars._Width_Height];
                      scrollbarVarsInfo._handleLengthRatio = handleRatio;
                  }
docs: Refreshes the handle length of the given scrollbar.
  @param isHorizontal True if the horizontal scrollbar handle shall be refreshed, false if the vertical one shall be refreshed.