{"ast":null,"code":"import ownerDocument from './ownerDocument';\n/**\n * Returns the actively focused element safely.\n *\n * @param doc the document to check\n */\n\nexport default function activeElement(doc) {\n if (doc === void 0) {\n doc = ownerDocument();\n }\n\n // Support: IE 9 only\n // IE9 throws an \"Unspecified error\" accessing document.activeElement from an