code: public boolean hasPseudo(E el, P pseudo)
      {
          HashMap<P, D> map = pseudoMaps.get(el);
          if (map == null)
              return false;
          else
              return map.containsKey(pseudo);
      }
docs: Checks if the given pseudo element is available for the given element
  @param el The element
  @param pseudo The tested pseudo element
  @return true when there is some value associated with the given pair