JSFiddle - React, Tailwind, and code Playground

HTML

<div class="widget-content">
<ul>
<li><a href="https://twitter.com/slycolor" class="ifthis"> <b>This Text Should Red</b></a>
    </li>
<li><a href="https://www.facebook.com/slycolor" class="ifthis"></i>  <b>This Text Should Red</b></a>
    </li>
</ul>
</div>
<br/>
<div class="widget-content">
Extra Text, this should not color red.
</div>

CSS

.social-sidebar li a{
color: red;
}

JavaScript

$('.widget-content li a').has('.ifthis').parent('.widget-content').addClass('social-sidebar');