Hi Jürgen,

I looked at history of fixes in WebHtmlEditor and found a change related to IE10 on 7/5/2012. I am pretty sure that current/latest versions work under IE10. I suggest you to upgrade NetAdvantage.

If you cannot or do not want to update to latest version, then you may try to get around that specific problem in your version of WebHtmlEditor. Though, you will need to use explicit js files for WebHtmlEditor instead of embedded resources. To use explicit js files, you should set WebHtmlEditor.JavaScriptDirectory to a directory local to your website and copy there all 4 ig_htmleditor*.js files.

The fix is quite simple: find and replace all statements "htmlElement.document" by "htmlElement.ownerDocument". There are only 3 lines affected by that.

1. ig_htmleditor.js:
 this._format=function(act,mod,restore,foc)
 {
   ...
   //e=e.document;
   e=e.ownerDocument||e.document;
   ...
 }

2. ig_htmleditor.js:
function iged_mainEvt(e)
{
   ...
   //if(!t)try{t=src.document.id;}catch(t){}
   if(!t)try{t=src.document||src.ownerDocument;t=t.id;}catch(ex){t=null;}
   ...
}

3. ig_htmleditor_ie.js:
function iged_init(ids,p1,p2,p3,p4,p5)
{
   ...
   //o._doc=function(){return this._elem.document;}
   o._doc=function(){return this._elem.ownerDocument||this._elem.document;}
   ...
}