code: public void removeAllCssProperties() {
          final long stamp = lock.writeLock();
          try {
              cssProperties.clear();
              abstractCssPropertyClassObjects.clear();
              super.removeAllFromAttributeValueMap();
          } finally {
              lock.unlockWrite(stamp);
          }
  
      }
docs: Removes all css properties
  
  @since 3.0.1