JSFiddle - React, Tailwind, and code Playground

HTML

<div id='test'>hello</div>

<iframe id="myFrame" style="width: 100px; height: 100px;"></iframe>

JavaScript

var allMyCode = "<div id='test'>html code</div>";
$("#myFrame").contents().find("body").html(allMyCode);
var el = document.createElement("script");
el.setAttribute("type","text/javascript");
el.innerHTML = "alert(document.getElementById('test').innerHTML);";
$("#myFrame").contents().find("body")[0].appendChild(el);