For IE11, Microsoft changed their browser's version identification. Now the navigator.useragent inspects the value as:
"Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; rv:11.0) like Gecko"
var userAgent = navigator.userAgent.toLowerCase();
var IEReg = /(msie\s|trident.*rv:)([\w.]+)/;
var match = IEReg.exec(userAgent);
if( match )
dojo.isIE = match - 0;
dojo.isIE = undefined;
The above dojo code will now detect browser version as 11 for IE 11.