Hi ludwig,

Can you show me the full error message what you got?

I have tried on my IE 10, I can not reproduce this issue. can you try on  demo http://www.richtexteditor.com/demo/? does it get the same problem? If yes, can you show me the full steps to reproduce this issue?

by the way, I have tried float the div and the insert document both. none of them got error.

Regards,

Ken