code: 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);
      });
  }
docs: Detach event(s) from element
  
  @private
  @param {(HTMLElement|string)} [sel]
  @param {string} [evt]
  @param {Function} [fn]