JSFiddle - React, Tailwind, and code Playground

JavaScript

function test() {
    var elem = document.createElement("span"); // Create an element
    var text = document.createTextNode("Hello"); // Create a textnode
    elem.appendChild(text); // add text to the element
    elem.id = "t"; // assign id to the element
    document.body.appendChild(elem); // Add it to the DOM
}
test();

var yourElement = document.getElementById("t"); // Get the element from the DOM
alert(yourElement.textContent); // alerts "Hello"