JSFiddle - React, Tailwind, and code Playground
HTML
<div id="foo">
<a href="http://www.somesite.com" target="_blank" class="footer">Site 1</a>
</div>
JavaScript
var fooA = document.getElementById("foo").children[0];
fooA.href = "http://www.othersite.com";
fooA.title = "Other Site";
fooA.firstChild.nodeValue = "Site 2";