JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
   <div id="column1">
      <div id="asset1"></div>
      <div id="asset2"></div>
   </div>
   <div id="column2">
      <div id="asset1"></div>
      <div id="asset2"></div>
   </div>
</div>

JavaScript

document.write($('#container > *').length);