CSS3 Validation: Property word-wrap doesn't exist : break-word

Dear reader,
 
The CSS 3 validator however presents an unexpected error.
 
 
The CSS 3 manual says you can use:
   Name:	 word-wrap	 
   Value:	 normal | break-word	
see: http://www.w3.org/TR/css3-text/#word-wrap
 
 
We have used "word-wrap: break-word;". The CSS 3 validator however
presents the following error:
   Property word-wrap doesn't exist : break-word
 
We have tried it within an external CSS-stylesheet and by direct
manually input into the CSS validator i.e.:
   body { word-wrap: break-word; }
Also "normal" instead of "break-word" gives the same error.
 
 
What is wrong, the validator or the manual?
 
 
Regards,
Jules Ernst
advisor web guidelines at ICTU 

E-mail: webrichtlijnen@overheid.nl
Telefoon: 070 8887898


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