docs: private String nodeTabs() {
      StringBuilder builder = new StringBuilder();
      builder.append("<div class='tabs'>");
      builder.append("<ul>");
      builder
          .append("<li class='tab' type='browsers'><a title='test slots' href='#'>Browsers</a></li>");
      builder
          .append("<li class='tab' type='config'><a title='node configuration' href='#'>Configuration</a></li>");
      builder.append("</ul>");
      builder.append("</div>");
      return builder.toString();
    }