Use feature detection instead of browser version
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IE 10 removes the legacy DX Filters. http://blogs.msdn.com/b/ie/archive/2012/06/04/legacy-dx-filters-removed-from-ie10-release-preview.aspx
Please use Opacity and standards effects in CSS/JS for IE10.
The EditArea code is highly based on Browser versions (isIE, isOpera...). Rather using browser check, please use feature detection techniques. See http://blogs.msdn.com/b/ie/archive/2010/04/14/same-markup-writing-cross-browser-code.aspx and http://msdn.microsoft.com/en-us/library/ie/hh273397\(v=vs.85).aspx
I used compat inspector (http://blogs.msdn.com/b/ie/archive/2012/01/20/ie10-compat-inspector.aspx) and found that code sniffing is causing the trouble.