Found a bug in the css vallidator 12 px or 12px

Found a bug in the css vallidator 12 px or 12px

px and the number should be written together
for exemple: 12px
not 12 px

in explorer it works fine like this 12 px

but if you make a dropdown menu with a class and you say:


<select name="selections" size=1 class="classname">

etc


and in the css style sheet:

..classname
{
font-family: Arial; (ok the family is wrong)
font-size: 12 px;
color: navy;
background-color: white;
}

and you look at this in the newest netscape version and in fire fox than the
font are to big if you compare them with explorer!!!

if you write 12px it it ok


Regards