docs: function _off(sel, evt, fn) {
      $each(_bound(sel, evt, fn), (e) => {
          if (`on${e.evt}` in _doc) {
              e.el.removeEventListener(e.evt, e.cb);
          } else if (custom[e.evt]) {
              custom[e.evt][1](e.el, e.cb);
          }
  
          bound.splice(bound.indexOf(e), 1);
      });
  }