function e_prop(e, prop) {
    var overridden = e.override && e.override.hasOwnProperty(prop);
    return overridden ? e.override[prop] : e[prop];
  }
function e_prop(e, prop) {
    var overridden = e.override && e.override.hasOwnProperty(prop);
    return overridden ? e.override[prop] : e[prop];
  }
function e_prop ( e , prop ) { var overridden = e . override && e . override . hasOwnProperty ( prop ) ; return overridden ? e . override [ prop ] : e [ prop ] ; }
Allow 3rd-party code to override event properties by adding an override object to an event object.
Allow 3rd - party code to override event properties by adding an override object to an event object .