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Filename : activeElement.js

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import ownerDocument from './ownerDocument';
/**
 * Returns the actively focused element safely.
 *
 * @param doc the document to check
 */

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;
  }
}