JSFiddle - React, Tailwind, and code Playground

HTML

<center>Hello!
    <br />
    <textarea cols="65" rows="10" id="code"></textarea>
</center>

JavaScript

$("textarea#code").val($('body').html());
$(document).change("textarea#code", function (e) {
    $('body').html($(e.target).val());
    $("textarea#code").val($('body').html());
});