JSFiddle - React, Tailwind, and code Playground

HTML

<input type="button" value="GO" onclick="myTest();">
<div id="resultarea">

</div>
<hr>
<div id="loadedcheck">

</div>

JavaScript

function myTest() {
    var code = "<p><b>HTML Inserted</b></p>"+validateLoading("document.getElementById(\"loadedcheck\").innerHTML=\"CODE WAS LOADED!\";");
    document.getElementById("resultarea").innerHTML = code;
}
function validateLoading(hasLoadedFunc) {
    var retVal = "<img src='data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7' onload='"+hasLoadedFunc+"this.parentNode.removeChild(this);'>";
    console.log(retVal);
    return retVal;
}