JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <tr>
        <td>
            <input type="radio" value="5" name="Form1a1" class="abobrinha Form1comentarioA" />
        </td>
    </tr>
</table>

JavaScript

var segundaClasse = document.querySelector('input[type="radio"]').classList[1];
alert(segundaClasse);