code: @Override
      public String toBigHtmlString() {
          if (prependDocType) {
              return new String((docTypeTag + "\n" + super.toBigHtmlString())
                      .getBytes(getCharset()), getCharset());
          }
          return super.toBigHtmlString();
      }
docs: /*
  (non-Javadoc)
  
  @see com.webfirmframework.wffweb.tag.html.AbstractHtml#toBigHtmlString()