code: function flushDynamicCssRules() {
          var rules = layoutStyleElem.sheet.cssRules,
              classCount = staleClassNames.length,
              i,
              j,
              ruleSuffix;
  
          for (i = 0; i < classCount; i++) {
              ruleSuffix = "." + staleClassNames[i] + " ";
              for (j = rules.length - 1; j >= 0; j--) {
                  if (rules[j].selectorText.indexOf(ruleSuffix) !== -1) {
                      layoutStyleElem.sheet.deleteRule(j);
                  }
              }
          }
          staleClassNames = [];
      }
docs: Removes the dynamic CSS rules corresponding to the classes in staleClassNames from the DOM.