FCKEditor doesn't work in IE10
//IE10 in fckeditor.js > method : FCKeditor_IsCompatibleBrowser find this >> var sBrowserVersion = navigator.appVersion.match(/MSIE (...)/)[1] ; and replace with >> var sBrowserVersion = navigator.appVersion.match(/MSIE ([\d.]+)/)[1] ; in fckeditorcode_ie.js find e.scopeName!='HTML' and change if condition to if(FCKBrowserInfo.IsIE&& e.scopeName && e.scopeName!='HTML') find D.parentElement().document!=B and change if to if(D.parentElement().document && D.parentElement().document!=B) find B.open("GET",A,false); and add this B.open("GET",A,false); try { B.responseType = "msxml-document"; } catch(e) {} B.send(null);