code: function(refreshCache) {
              var result = {},
                  selector;
  
              if (rules === null || refreshCache) {
                  CSS.refreshCache();
              }
              for (selector in rules) {
                  result[selector] = rules[selector].cssRule;
              }
              return result;
          }
docs: Gets all css rules for the document
  @param {Boolean} refreshCache true to refresh the internal cache
  @return {Object} An object (hash) of rules indexed by selector