code: public void removeMatch(Element e, PseudoClassType pseudoClass)
      {
          if (elements != null)
          {
              Set<PseudoClassType> classes = elements.get(e);
              if (classes != null)
                  classes.remove(pseudoClass);
          }   
      }
docs: Removes the pseudo class from the given element.
  @param e the DOM element
  @param pseudoClass the pseudo class to be removed