docs: function launchAddInclude(evSrc) {
  
          var pageId = evSrc.getAttribute('data-target-page-id');
          var region = evSrc.getAttribute('data-target-region');
          
          window.parent.postMessage({
              name: 'add-include',
              pageId: pageId,
              regionName: region
          }, window.location.origin);
      }