JSFiddle - React, Tailwind, and code Playground

HTML

<a data-avatar="http://www.gravatar.com/avatar/30f245e21b682c3c8708e41fffbe7124?size=80&amp;rating=pg&amp;default=mm" href="#">me</a>

CSS

a[data-avatar]::before {
    content: "";
    background: url(http://www.gravatar.com/avatar/30f245e21b682c3c8708e41fffbe7124?size=80&amp;rating=pg&amp;default=mm) no-repeat 0 0;
    background-size: 16px 16px;
    display: inline-block;
    width: 16px;
    height: 16px;
}