code: function (property) {
                  var dpi = this.getDpi();
                  switch (this.cfg.PROPERTIES[property].orientation) {
                      case this.cfg.HORIZONTAL :
                          return dpi.x;
                      case this.cfg.VERTICAL :
                          return dpi.y;
                      default : // if composite, then dpi = average
                          return (dpi.x + dpi.y) / 2;
                  }
              }
docs: Returns the DPI of a given CSS property dependending on it's orientation. See
  <code>aria.utils.css.PropertiesConfig</code> for details.
  @param {String} property Camel-case name, e.g. "marginLeft"