code: public int doStartTag()
              throws JspException
      {
          String scope = getRealIdScope();
          pushIdScope();
  
          WriteRenderAppender writer = new WriteRenderAppender(pageContext);
          writeBeforeBlocks(writer);
  
          // if there is a scopeId, then we need to create a div to contains everything
          if (_idScope != null) {
              write("<div");
              write(" netui:idScope=\"");
              write(scope);
              write("\" ");
              write(">");
          }
  
          return EVAL_BODY_INCLUDE;
      }
docs: /////////////////////////////// Tag Methods ////////////////////////////////////////