-moz and -webkit along with -o and -ms all are called vendor-prefix
These are the vendor-prefixed properties offered by the relevant rendering engines. (-webkit for Chrome and Safari, -moz for Firefox, -o for Opera, -ms for Internet Explorer).
.elementClass {
    border-radius: 5px;
    -moz-border-radius: 5px;
    -o-border-radius: 5px;
    -ms-border-radius: 5px;
    -webkit-border-radius: 5px;
}
Typically they're used to implement new, or proprietary CSS features, Non-webkit browsers will support the -webkit prefix. That is the solution being considered by the W3C.
                       
                    
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