How to give opacity to border

Css border opacity

div {
       border: 1px solid rgba(255, 0, 0, .5);
    -webkit-background-clip: padding-box; /* for Safari */
    background-clip: padding-box; /* for IE9+, Firefox 4+, Opera, Chrome */
}

How to give opacity to border

   border: 1px solid rgba(255, 0, 0, .5);

Source: stackoverflow.com

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