JSFiddle - React, Tailwind, and code Playground

HTML

<a href="foo.xml">foo.xml</a>

CSS

a[href$=".xml"]:before {
    content: '';
    background-image: url(http://public.zopyx.com/html9.svg);
    background-size: contain;
    width: 20px;
    height: 20px;
    display: inline-block;
}