JSFiddle - React, Tailwind, and code Playground

HTML

<div class="htmlChunk">
    <img src="https://www.google.co.uk/images/srpr/logo3w.png" class="Thumb"/>  
</div>

JavaScript

console.log($('.htmlChunk').find('img.Thumb'));
console.log($('.htmlChunk').find('img.Thumbs'));