<html> <head> <meta http-equiv="X-UA-Compatible" content="IE=11, IE=10"/> <script> function getInternetExplorerVersion() { var rv = -1; // Return value assumes failure. if (navigator.appName == 'Microsoft Internet Explorer') { var ua = navigator.userAgent; var re = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})"); if (re.exec(ua) != null) { rv = parseFloat( RegExp.$1 ); } } return rv; } function checkVersion() { var msg = "You're not using Internet Explorer."; var ver = getInternetExplorerVersion(); if ( ver > -1 ) { if ( ver >= 11.0 ) { msg = "You're using a recent copy of Internet Explorer." } else { msg = "You should upgrade your copy of Internet Explorer."; } } alert(msg); } checkVersion(); </script> </head> </html>
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