css valido?

[simo600]

non capisco xkè mi da quei warning....secondo voi posso considerarlo valido?

/* CSS Document */
body {
    background-color: #346865;
}

#logo {
    background-color: transparent;
}

.body {
    font-family: Georgia, "Times New Roman", Times, serif;
    font-size: 14px; 
    color: #000000;
    background-color: #FFFFFF;
    border-top-color: #E8E8E8;
    border-right-color: #E8E8E8;
    border-bottom-color: #E8E8E8;
    border-left-color: #E8E8E8;
    border-top-style: none; 
    border-right-style: none;
    border-bottom-style: none;
    border-left-style: none;
    padding-top: 25px;
    padding-right: 15px;
    padding-bottom: 15px;
    padding-left: 15px;
    text-align: justify; 
    line-height: 23px;
}
#tab1 {
    background-color: #ECF0F8;
    border: medium ridge #DDE5F6;
    font-family: "Times New Roman", Times, serif;
    font-weight: 600;
    font-size: 12pt; 
    height: 30px;
}

.links {
    font-family: Geneva, Arial, Helvetica, sans-serif;
    font-size: 12pt;
    font-style: normal;
    color: #60ABD6;
    background-color: #ECF0F8;
    font-weight: 600; 
    border: thin solid #E8E8E8;
    border-top-style: none;
    border-right-style: none;
    border-left-style: none;
}

.links1 {
    font-family: Geneva, Arial, Helvetica, sans-serif;
    font-size: 12pt; 
    font-style: normal;
    color: #60ABD6;
    background-color: #ECF0F8;
    font-weight: 600;
    border: thin solid #E8E8E8;   
}

.links a:hover {
    color: #ECF0F8;
    background-color: #92D3F8; 
    display: block;
    text-decoration:underline;
}
   
a:link {
    color: #60ABD6;
    text-decoration : none;
}

a:visited {
    color: #60ABD6;
    text-decoration : none;
}
   
#position {
    font-family: Verdana, Arial, Helvetica, sans-serif;
    font-style: italic;
    background-color: #FFFFFF;
    border-top-color: #E8E8E8;
    border-right-color: #E8E8E8;
    border-bottom-color: #E8E8E8; 
    border-left-color: #E8E8E8;
    border-top-style: none;
    border-right-style: none;
    border-bottom-style: none;
    border-left-style: none;
}

.under {
    font-family: "Times New Roman", Times, serif; 
    font-size: 10pt;
}

a img {
    border-width:0;
}

[Mich_]

Quale warning?

Comunque se in un blocco definisci il color e non il background-color o viceversa, ti viene sempre segnalato il warning: il validatore non e` in grado di verificare se nel blocco superiore e` definito un colore/sfondo con contrasto sufficiente.

[simo600]

allora posso considerarlo valido e inserire l'img