JSFiddle - React, Tailwind, and code Playground

HTML

<ul class="reference">
    <li><a class="symbol" href="http://www.under-88.blogspot.com/">www.under-88.blogspot.com</a></li>
    <li><a class="symbol" href="http://www.css-tricks.com/" >www.css-tricks.com</a></li>
    <li><a class="symbol" href="http://www.jquery.com/" >www.jquery.com</a></li>
    <li><a class="symbol" href="http://www.w3schools.com/" >www.w3schools.com </a></li>
    <li><a class="symbol" href="http://www.tympanus.net/codrops/" >www.tympanus.net</a></li>
    <li><a class="symbol" href="http://www.red-team-design.com/">www.red-team-design.com</a></li>
</ul>

JavaScript

$(".symbol[href^='http']").each(function() {
    $(this).css({
        background: "url(http://g.etfv.co/" + this.href + ") left center no-repeat",
        "padding-left": "20px"
    });
});