JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <input type="text" value="Escreve o teu nome" />
</div>

JavaScript

var input = document.querySelector('input');
input.setAttribute('dataA', 'foo');
console.log(1, input.dataA, input.parentNode.innerHTML);
input.dataB = 'foo';
console.log(2, input.dataB, input.parentNode.innerHTML);