docs: function () {
              var output = [], isLazy, typeUtils = ariaUtilsType;
              var placeholders = this._pageConfig.pageComposition.placeholders || {};
              for (var placeholderName in placeholders) {
                  if (placeholders.hasOwnProperty(placeholderName)) {
                      isLazy = false;
                      var singlePlaceholderArray = placeholders[placeholderName];
  
                      if (!typeUtils.isArray(singlePlaceholderArray)) {
                          singlePlaceholderArray = [singlePlaceholderArray];
                      }
  
                      for (var i = 0; i < singlePlaceholderArray.length; i += 1) {
                          if (singlePlaceholderArray[i].lazy) {
                              isLazy = true;
                          }
                      }
                      if (isLazy) {
                          output.push(placeholderName);
                      }
                  }
              }
              return output;
          }