JSFiddle - React, Tailwind, and code Playground

HTML

<textarea id="text">Type &lt;b&gt;HTML&lt;/b&gt; here...</textarea><br>
<iframe id="frame">

JavaScript

$( function () {
	var $text = $( '#text' );
    var doc   = $( '#frame' )[0].contentWindow.document;
    var $body = $( 'body', doc );
    var hot = function () {
        $body.html( $text.val() );
    };
    $text.keyup( hot );
    hot();
} );