code: function(el) {
              var height = el.offsetHeight;
  
              if (el.getBoundingClientRect) {
                  var rect = el.getBoundingClientRect();
                  height = rect.bottom - rect.top;
              }
  
              return height;
          }
docs: Returns the sub-pixel height of the el, using getBoundingClientRect, if available,
  otherwise returns the offsetHeight
  @method _getPreciseHeight
  @private
  @param {HTMLElement} el
  @return {Float} The sub-pixel height if supported by the browser, else the rounded height.