JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="dvHeader">
<label id="lbl">Hello WOrld</label>
<button id="btn">
Button 1!
</button>
<button id="btn1">
Button 2!
</button>
</div>

JavaScript

$("#btn").on("click",()=>{
console.log('here');
  var el = document.getElementById("lbl");
 //el.html("a");
 el.textContent = 'a';
 });