JSFiddle - React, Tailwind, and code Playground

HTML

<span id="myElement">test</span><br/>
<span id="element2">test2</span>

JavaScript

var myElement = document.getElementById("myElement"),
    element2 = document.getElementById("element2");

// You can use a shorter variable name if you want
var innerTextOrTextContent = "textContent" in document.body ? "textContent" : "innerText";

// Set an element's text:
myElement[innerTextOrTextContent] = "Added using: "+innerTextOrTextContent;

// The createTextNode() example:
var tNode = document.createTextNode("Added using createTextNode()");
myElement.appendChild(tNode);