text: import ownerDocument from './ownerDocument';
  /**
   * Return the actively focused element safely.
   *
   * @param doc the document to checl
   */
  
  export default function activeElement(doc) {
    if (doc === void 0) {
      doc = ownerDocument();
    }
  
    // Support: IE 9 only
    // IE9 throws an "Unspecified error" accessing document.activeElement from an <iframe>
    try {
      var active = doc.activeElement; // IE11 returns a seemingly empty object in some cases when accessing
      // document.activeElement from an <iframe>
  
      if (!active || !active.nodeName) return null;
      return active;
    } catch (e) {
      /* ie throws if no active element */
      return doc.body;
    }
  }