code: private Node createPseudoElement(ElementBox box, PseudoElementType pseudo) 
      {
          Element n = box.getElement();
          //New box style
          NodeData style = decoder.getElementStyleInherited(n, pseudo);
          if (style != null)
          {
              TermList cont = style.getValue(TermList.class, "content");
              if (cont != null && cont.size() > 0)
              {
                  //create the DOM tree for the pseudo element
                  //parent
                  Element pelem = createAnonymousElement(n.getOwnerDocument(), "XPspan", "inline"); 
                  //content elements
                  for (Term<?> c : cont)
                  {
                      if (c instanceof TermIdent)
                      {
                      }
                      else if (c instanceof TermString)
                      {
                          Text txt = n.getOwnerDocument().createTextNode(((TermString) c).getValue());
                          pelem.appendChild(txt);
                      }
                      else if (c instanceof TermURI)
                      {
                      }
                      else if (c instanceof TermFunction.Attr)
                      {
                          TermFunction.Attr f = (TermFunction.Attr) c;
                          String val = HTMLNorm.getAttribute(n, f.getName());
                          Text txt = n.getOwnerDocument().createTextNode(val);
                          pelem.appendChild(txt);
                      }
                  }
  
                  //use the pseudo element style for the new (main) element
                  decoder.useStyle(pelem, null, style);
  
                  return pelem;
              }
              else
                  return null; //no contents
          }
          else
              return null; //no pseudo declaration
      }
docs: Creates a new box for a pseudo-element.
  @param box the parent box of the pseudo element
  @param pseudo The pseudo element name
  @return A new box of a subclass of ElementBox based on the value of the 'display' CSS property