/**

 * Copyright (c) Meta Platforms, Inc. and affiliates.

 *

 * This source code is licensed under the MIT license found in the

 * LICENSE file in the root directory of this source tree.

 *

 * @flow

 */

export default function getActiveElement(doc: ?Document): ?Element {

  doc = doc || (typeof document !== 'undefined' ? document : undefined);

  if (typeof doc === 'undefined') {

    return null;

  }

  try {

    return doc.activeElement || doc.body;

  } catch (e) {

    return doc.body;

  }

}