@Override
 protected String renderHtml() {
   final StringBuilder sb = new StringBuilder();
   for (HtmlNode node : nodes) {
     sb.append(node.toHtml());
   }
   return sb.toString();
 }
 /** {@inheritDoc} */
 @Override
 public String renderHtml() {
   final StringBuilder sb = new StringBuilder(1024).append(startTag.toHtml());
   for (HtmlNode node : content) {
     sb.append(node.toHtml());
   }
   if (endTag != null) {
     sb.append(endTag.toHtml());
   }
   return sb.toString();
 }