Prevent PHP Tidy from converting style tag data to CDATA
The addition of CDATA tags is intended to help browser know they should parse characters like '<' and '&' as literal characters instead of html syntax. Tidy does not appear to have any documented configuration that would prevent generating them for inline css/javascript. The only option would be moving the css to a separate file. In which case it doesn't need the CDATA tag.
see http://tidy.sourceforge.net/docs/quickref.html and https://en.wikipedia.org/wiki/CDATA for more information.