JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/@kademi/keditor@2.0.1/dist/js/keditor.js"></script>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@kademi/keditor@2.0.1/dist/css/keditor.css" data-type="keditor-style">
<link rel="stylesheet" href="https://pro.fontawesome.com/releases/v5.10.0/css/all.css" data-type="keditor-style">

<div id="content-area"></div>

<script type="text/javascript" data-keditor="script">
    $(function () {
        $('#content-area').keditor();
    });
</script>

JavaScript

(function ($) {

    // Mocked functions because not provided in the question
    const noop = str => str;
    const html_beautify = noop;
    const js_beautify = noop;
    const PR = {
        prettyPrintOne: noop
    }

    $(function () {
        initModalSource();
        initModalContent();
        initToolbar();
    });

    function initToolbar() {
        var toolbar = $('<div class="toolbar"></div>');
        var btnViewSource = $('<button type="button" class="view-source"><i class="fa fa-code"></i> View source</button>');
        var btnViewContent = $('<button type="button" class="view-content"><i class="fa fa-file-text-o"></i> Get content</button>');
        var btnBackToList = $('<a href="./" class="view-content"><i class="fa fa-list"></i> Examples list</a>');

        toolbar.appendTo(document.body);
        toolbar.append(btnViewSource);
        toolbar.append(btnViewContent);
        toolbar.append(btnBackToList);

        btnViewSource.on('click', function () {
            $('#modal-source').modal('show');
        });

        btnViewContent.on('click', function () {
            var modal = $('#modal-content');
            modal.find('.content-html').html(
                beautifyHtml(
                    $('#content-area').keditor('getContent')
                )
            );

            modal.modal('show');
        });
    }

    function initModalContent() {
        var modal = $(
            '<div id="modal-content" class="modal fade" tabindex="-1">' +
            '    <div class="modal-dialog modal-lg">' +
            '        <div class="modal-content">' +
            '            <div class="modal-header">' +
            '                <button type="button" class="close" data-dismiss="modal">&times;</button>' +
            '                <h4 class="modal-title">Content</h4>' +
            '            </div>' +
            '            <div class="modal-body">' +
            '                <pre class="prettyprint lang-html...