docs: function initOnClick() {
              var clicks = document.querySelectorAll('[data-nctr]');
  
              for (var i = 0; i < clicks.length; i++) {
                  var tag = clicks[i];
                  if (tag.addEventListener) {
                      tag.addEventListener("click", clickTrack, false);
                  } else {
                      if (tag.attachEvent) {
                          tag.attachEvent("onclick", clickTrack);
                      }
                  }
  
              }
          }