Why the "word-wrap:break-word" CSS can't pass on the W3C CSS validator ?

From: cqing <cqingneng@hotmail.com> Date: Wed, 6 Jun 2012 02:20:56 +0000 Message-ID: <BLU156-W512C00B9752EBCD150AF62BF0D0@phx.gbl> To: <www-validator-css@w3.org> · This archive was generated by hypermail 2.2.0+W3C-0.50 : Wednesday, 27 June 2012 00:14:29 GMT

Hi  ,I had some problems, need your help. there are some CSS properties can't pass  on the W3C CSS validator (Profile: CSS level 3).As follows:1.   word-wrap: break-word;2.   zoom : 1;3.   -webkit-appearance : none ;4.   -webkit-border-radius : 0 ;  I did not find a reasonable explanation , could you help me explain? thank you very much. 		 	   		  