It's possible this should go under the RadSpell control, but...
In IE11, if the next wrong word doesn't have any suggestions, the spell check doesn't open the commands window (the one with Ignore/Ignore All/Change Manually/etc), and the spell check can't continue. This happens in both iframe and div modes. No errors are thrown.
Also, in IE11, when the RadEditor is set to ContentAreaMode="Div" and contained inside an iframe, clicking on the spell check commands window for the first misspelled word results in the following JavaScript error:
Object doesn't support property or method 'createTextRange'.
Screenshot attached.
In IE11, if the next wrong word doesn't have any suggestions, the spell check doesn't open the commands window (the one with Ignore/Ignore All/Change Manually/etc), and the spell check can't continue. This happens in both iframe and div modes. No errors are thrown.
Also, in IE11, when the RadEditor is set to ContentAreaMode="Div" and contained inside an iframe, clicking on the spell check commands window for the first misspelled word results in the following JavaScript error:
Object doesn't support property or method 'createTextRange'.
Screenshot attached.