code: function( data ){
  
              // interpred data as either dom node or event data
              var el = (data.nodeType && data) || (data.body && data.body.view)
                  ;
  
              if ( el ){
                  // attach to viewport
                  this.el.appendChild( el );
              }
  
              return this;
          }
docs: DomRenderer#attach( data ) -> this
  - data (HTMLElement|Object): DOM node or event data (`data.body`)
  
  Event callback to attach a node to the viewport