JSFiddle - React, Tailwind, and code Playground

HTML

<p>This PARAGRAPH has two nodes, 
    <b id="myNodeOne">Node One</b>, and 
    <b id="myNodeTwo">Node Two</b>.
</p>
<p></p>
<button onclick="function1();">Node One has a Next Sibling</button>

JavaScript

function function1() {
   document.getElementById("myNodeOne").parentNode.nextSibling.nextSibling.innerHTML = "asdfsdf";
}