Problem with the W3C CSS Validator

Dear Whom it may Concern,

I should not be getting the following errors because these properties
should be used to keep compatibility with different browsers. For example:
the -moz was used to keep compatibility with Firefox, and -webkit- with
Chrome and Safari. Opera would require an -o-.
It seems that the CSS validator doesn't recognize these properties.
W3C CSS Validator results for style.css (CSS level 3)
 Sorry! We found the following errors (4)
URI : style.css  2body Property -moz-box-shadow doesn't exist : 0 0 5px 5px
#888 3body Property -webkit-box-shadow doesn't exist : 0 0 5px 5px #888 49
..summaryTag Property -moz-box-shadow doesn't exist : 0 0 5px #888 50
..summaryTag Property -webkit-box-shadow doesn't exist : 0 0 5px #888

-- 
VR
LLOYD FOX, C/4C, AFROTC

205th AFROTC Cadet Wing
Southern Illinois University Carbondale
rlloydfox0428@siu.edu / 618.697.8579