JSFiddle - React, Tailwind, and code Playground

HTML

<!doctype html>
<html>
  <head>
    <title>My website</title>
  </head>
  <body>
    <button id="counter">count: 0</h1>
    <script src="script.js"></script>
  </body>
</html>

JavaScript

let count = 0;
let buttonElement = document.getElementById('counter');

function incrementCounter() {
  count += 1;
  buttonElement.innerText = `count: ${count}`;
}

buttonElement.addEventListener('click', incrementCounter);