JSFiddle - React, Tailwind, and code Playground

HTML

<a href=http://github.com>GitHub</a>
<p>
    <a href=http://habrahabr.ru>Habrahabr</a>
</p>

<p>
    <a href=http://stackoverflow.com/>StackOverflow</a>
</p>

CSS

a[href*="github.com"]{
    padding-left:15px;
    background:url(http://www.google.com/s2/u/0/favicons?domain=github.com) left center no-repeat;
    background-size: 13px;
}

a[href*="habrahabr.ru"]{
    padding-left:15px;
    background:url(http://www.google.com/s2/u/0/favicons?domain=habrahabr.ru) left center no-repeat;
    background-size: 13px;
}

a[href*="stackoverflow.com"]{
    padding-left:15px;
    background:url(http://www.google.com/s2/u/0/favicons?domain=stackoverflow.com) left center no-repeat;
    background-size: 13px;
}