docs: function destroyRenderedElems(oldElems) {
          if (!oldElems) {
              return;
          }
          oldElems.forEach(function (oldElem) {
              if (!oldElem) {
                  return;
              }
              var destroyEvent = customEvent('grid-rendered-elem-destroy', true);
              oldElem.dispatchEvent(destroyEvent);
          });
      }