JSFiddle - React, Tailwind, and code Playground

HTML

<div id="section">
  <div id="title" onclick="hideBody(this)">Hello world (click to hide body)</div>
  <div id="body">Some text here</div>
</div>

JavaScript

function hideBody(el) {
    'use strict';
    var sibling = el.nextElementSibling;
    console.log(sibling);
    
    sibling.style.visibility = 'hidden';
}