JSFiddle - React, Tailwind, and code Playground

HTML

<span id="myspan"> hereismytext </span>

JavaScript

var myspan = document.getElementById('myspan');

if (myspan.innerText) {
    myspan.innerText = "new text for other browsers";
}
else
if (myspan.textContent) {
        myspan.textContent = "newtext for FFox, etc.";
}