JSFiddle - React, Tailwind, and code Playground

HTML

<input type="button" id = "btn" value="Update Page" />
<textarea id="mycode"></textarea>
<iframe id="display"></iframe>

JavaScript

document.getElementById('btn').onclick = function()
{
    var x = document.getElementById('mycode').value;
    document.getElementById('display').contentDocument.write(x);
}