-o css

/* The point of "vendor prefixes" was to allow browser makers 
to start supporting experimental CSS declarations. */

/* -webkit => Chrome, Safari */
/* -moz => Firefox */
/* -o => Opera */
/* -ms => Internet Explorer */

/* example  */
.elementClass {
    -moz-border-radius: 2em;
    -ms-border-radius: 2em;
    -o-border-radius: 2em;
    -webkit-border-radius: 2em;
    border-radius: 2em;
}

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