Function callback

MathBox/mathbox-bundle.js:41955–41957

(event)

      // Attach event handler at last level
      if (target && (target.on || target.addEventListener)) {
        var callback = function (event) {
          object[dest] && object[dest](event, context);
        };

        // Polyfill for both styles of event listener adders
        THREE.Binder._polyfill(target, [ 'addEventListener', 'on' ], function (method) {