docs: function click(div, target) {
      var newTab, oldTab, oldTabError;
  
      forEachEl(':scope>header:not(.tabz-enable)', function(tab) { // todo: use a .find() polyfill here
          if (tab.contains(target)) {
              newTab = tab;
          }
      }, div);
  
      if (newTab) {
          oldTab = this.enabledTab(div);
          if (!oldTab || !toggleTab.call(this, oldTab, false)) {
              toggleTab.call(this, newTab, true);
          }
      }
  }