ontentsElem) {
          if (singleContentsElem.querySelectorAll(tocLevels).length > 0) {
            singleContentsElem.querySelectorAll(tocLevels).forEach(function (elem) {
              if (toggleTocElem && !toggleTocElem.checked) {
                return null;
              }
              
              if (notAllowedTitleIds && notAllowedTitleIds.includes(elem.getAttribute('id'))) {
                return null;
              }

              if (document.documentElement.scrollTop >= elem.offsetTop) {
