JSFiddle - React, Tailwind, and code Playground
HTML
<div id="test1"></div>
<div id="test2"></div>
JavaScript
document.getElementById('test1').innerHTML = "<button>Teste</button>";
document.getElementById('test2').textContent = "<button>Teste</button>";
console.log(document.getElementById('test1').innerHTML);
console.log(document.getElementById('test2').textContent);