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

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.