JSFiddle - React, Tailwind, and code Playground

HTML

<div id="output1">output log</div>
<div id="output2">output log</div>

JavaScript

if(document.addEventListener)
{
    document.addEventListener('load', function() {
        document.querySelector("#output2").innerHTML = "789";
    }, false);
}

document.querySelector("#output1").innerHTML = "456";