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( function( factory ) { if ( typeof define === "function" && define.amd ) { // AMD. Register as an anonymous module. define( [ "jquery", "./version" ], factory ); } else { // Browser globals factory( jQuery ); } } ( function( $ ) { return $.ui.safeActiveElement = function( document ) { var activeElement; // Support: IE 9 only // IE9 throws an "Unspecified error" accessing document.activeElement from an <iframe> try { activeElement = document.activeElement; } catch ( error ) { activeElement = document.body; } // Support: IE 9 - 11 only // IE may return null instead of an element // Interestingly, this only seems to occur when NOT in an iframe if ( !activeElement ) { activeElement = document.body; } // Support: IE 11 only // IE11 returns a seemingly empty object in some cases when accessing // document.activeElement from an <iframe> if ( !activeElement.nodeName ) { activeElement = document.body; } return activeElement; }; } ) );
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