2. Delete the default content
3. Type a single alphanumeric word
4. Press the "Insert Paragraph" button
5. Notice script error
The cause for this is in the IE implementation file. The obfuscated code where the error is thrown looks like:
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Ox6b[OxObb1c[0x2]].appendChild(Ox9cc) ;
The variable Ox9cc is a paragraph element and is created with document.createElement() earlier in the code. The document that creates this element is the window.top.document, not the editor's document. The Ox6b[OxObb1c[0x2]] is the document.body of the editor frame and tries to append the paragraph element. This throws the error because the element was created in a different document.