JSFiddle - React, Tailwind, and code Playground

HTML

<iframe id="iframe">

</iframe>

JavaScript

function setIframe(html){
document.getElementById('iframe').src = "data:text/html;charset=utf-8," + escape(html);
}

setIframe("hello <b>this</b> is <u>html</u>");

setTimeout(function(){
   setIframe("<h1>nice</h1>");
},4000);