It is possible to write in hidden elements in IE 9+.

[Daazku]

It seems that in IE10 (at least) you can write in hidden elements that have innerHTML !== ; If the said element is contenteditable:false it is worse because you cannot get out of it.

It may relate to this: ​https://dev.ckeditor.com/ticket/10641

Test case: ​http://jsbin.com/UNOWOba/5

PS: I discovered the problem because I use an element (<span contenteditable="false" style="display:none">&nbsp;</span>) just before a space holder that is removed on click and on IE the users could not write... It may suggest a cursor positionning problem. PSS: No problem in chrome.

[Daazku]

Well it seems to be a selection problem from IE 9+. Probably caused by getStartElement??

In Chrome the returned element is the editor.
In IE8- the returned element is a P.
In IE9+ the returned element is the span...

[Jakub Ś]

Problem can be reproduced from CKEditor 4.0 in IE9-10 in inline editor only.

Put test.htm file in samples folder and open it in a browser. Next click inside each editor and try to write something.

1. Iframed editor works
2. inline editor with non-empty and invisible span doesn't work.
3. In this span it is only possible to write after pressing enter <span style="display:none">&nbsp;</span>
4. In this span it isn't possible to write at all <span style="display:none" contenteditable="false">&nbsp;</span>