code: public void addFooter(Content contentTree) {
          contentTree.addContent(HtmlConstants.END_OF_CLASS_DATA);
          Content htmlTree = (configuration.allowTag(HtmlTag.FOOTER))
                  ? HtmlTree.FOOTER()
                  : contentTree;
          addNavLinks(false, htmlTree);
          addBottom(htmlTree);
          if (configuration.allowTag(HtmlTag.FOOTER)) {
              contentTree.addContent(htmlTree);
          }
      }
docs: {@inheritDoc}