JSFiddle - React, Tailwind, and code Playground

HTML

<div id="main">

</div>

JavaScript

let main = document.getElementById('main');
fetch('https://mdn.github.io/fetch-examples/fetch-text/page1.txt')
.then(
	r => r.text().then(data => {
			main.innerHTML = data;
      let h = main.getElementsByTagName('h2')
			alert(h[0].textContent);
    })
);