JSFiddle - React, Tailwind, and code Playground

HTML

<a href="#">No class</a>
<a href="#" class="one">One class</a>
<a href="#" class="one two">2 classes</a>
<a href="#" class="one" id="zero">Class and ID</a>
<a href="#" id="one">One ID</a>
<a href="#" class="one" onclick="this.removeAttribute('class'); return !1">Dynamic class (click to change)</a>

CSS

a:not([class]):not([id]) { color: red; }