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Here is a full demo with code of CKEditor 5. The editor feels modern and beautiful and full fledged with modern editing tools. You can easily copy and customize the editor from below code area.

Demo:

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>CKEditor 5 - Full demo with code</title>
    </head>
    <body>
        <style>
            #container {
                width: 1000px;
                margin: 20px auto;
            }
            .ck-editor__editable[role="textbox"] {
                /* editing area */
                min-height: 200px;
            }
            .ck-content .image {
                /* block images */
                max-width: 80%;
                margin: 20px auto;
            }
        </style>
        <div id="container">
            <div id="editor">
            </div>
        </div>
        <!--
            The "super-build" of CKEditor 5 served via CDN contains a large set of plugins and multiple editor types.
            See https://ckeditor.com/docs/ckeditor5/latest/installation/getting-started/quick-start.html#running-a-full-featured-editor-from-cdn
        -->
        <script src="https://cdn.ckeditor.com/ckeditor5/35.3.2/super-build/ckeditor.js"></script>
        <!--
            Uncomment to load the Spanish translation
            <script src="https://cdn.ckeditor.com/ckeditor5/35.3.2/super-build/translations/es.js"></script>
        -->
        <script>
            // This sample still does not showcase all CKEditor 5 features (!)
            // Visit https://ckeditor.com/docs/ckeditor5/latest/features/index.html to browse all the features.
            CKEDITOR.ClassicEditor.create(document.getElementById("editor"), {
                // https://ckeditor.com/docs/ckeditor5/latest/features/toolbar/toolbar.html#extended-toolbar-configuration-format
                toolbar: {
                    items: [
                        'exportPDF','exportWord', '|',
                        'findAndReplace', 'selectAll', '|',
                        'heading', '|',
                        'bold', 'italic', 'strikethrough', 'underline', 'code', 'subscript', 'superscript', 'removeFormat', '|',
                        'bulletedList', 'numberedList', 'todoList', '|',
                        'outdent', 'indent', '|',
                        'undo', 'redo',
                        '-',
                        'fontSize', 'fontFamily', 'fontColor', 'fontBackgroundColor', 'highlight', '|',
                        'alignment', '|',
                        'link', 'insertImage', 'blockQuote', 'insertTable', 'mediaEmbed', 'codeBlock', 'htmlEmbed', '|',
                        'specialCharacters', 'horizontalLine', 'pageBreak', '|',
                        'textPartLanguage', '|',
                        'sourceEditing'
                    ],
                    shouldNotGroupWhenFull: true
                },
                // Changing the language of the interface requires loading the language file using the <script> tag.
                // language: 'es',
                list: {
                    properties: {
                        styles: true,
                        startIndex: true,
                        reversed: true
                    }
                },
                // https://ckeditor.com/docs/ckeditor5/latest/features/headings.html#configuration
                heading: {
                    options: [
                        { model: 'paragraph', title: 'Paragraph', class: 'ck-heading_paragraph' },
                        { model: 'heading1', view: 'h1', title: 'Heading 1', class: 'ck-heading_heading1' },
                        { model: 'heading2', view: 'h2', title: 'Heading 2', class: 'ck-heading_heading2' },
                        { model: 'heading3', view: 'h3', title: 'Heading 3', class: 'ck-heading_heading3' },
                        { model: 'heading4', view: 'h4', title: 'Heading 4', class: 'ck-heading_heading4' },
                        { model: 'heading5', view: 'h5', title: 'Heading 5', class: 'ck-heading_heading5' },
                        { model: 'heading6', view: 'h6', title: 'Heading 6', class: 'ck-heading_heading6' }
                    ]
                },
                // https://ckeditor.com/docs/ckeditor5/latest/features/editor-placeholder.html#using-the-editor-configuration
                placeholder: 'Welcome to CKEditor 5!',
                // https://ckeditor.com/docs/ckeditor5/latest/features/font.html#configuring-the-font-family-feature
                fontFamily: {
                    options: [
                        'default',
                        'Arial, Helvetica, sans-serif',
                        'Courier New, Courier, monospace',
                        'Georgia, serif',
                        'Lucida Sans Unicode, Lucida Grande, sans-serif',
                        'Tahoma, Geneva, sans-serif',
                        'Times New Roman, Times, serif',
                        'Trebuchet MS, Helvetica, sans-serif',
                        'Verdana, Geneva, sans-serif'
                    ],
                    supportAllValues: true
                },
                // https://ckeditor.com/docs/ckeditor5/latest/features/font.html#configuring-the-font-size-feature
                fontSize: {
                    options: [ 10, 12, 14, 'default', 18, 20, 22 ],
                    supportAllValues: true
                },
                // Be careful with the setting below. It instructs CKEditor to accept ALL HTML markup.
                // https://ckeditor.com/docs/ckeditor5/latest/features/general-html-support.html#enabling-all-html-features
                htmlSupport: {
                    allow: [
                        {
                            name: /.*/,
                            attributes: true,
                            classes: true,
                            styles: true
                        }
                    ]
                },
                // Be careful with enabling previews
                // https://ckeditor.com/docs/ckeditor5/latest/features/html-embed.html#content-previews
                htmlEmbed: {
                    showPreviews: true
                },
                // https://ckeditor.com/docs/ckeditor5/latest/features/link.html#custom-link-attributes-decorators
                link: {
                    decorators: {
                        addTargetToExternalLinks: true,
                        defaultProtocol: 'https://',
                        toggleDownloadable: {
                            mode: 'manual',
                            label: 'Downloadable',
                            attributes: {
                                download: 'file'
                            }
                        }
                    }
                },
                // https://ckeditor.com/docs/ckeditor5/latest/features/mentions.html#configuration
                mention: {
                    feeds: [
                        {
                            marker: '@',
                            feed: [
                                '@apple', '@bears', '@brownie', '@cake', '@cake', '@candy', '@canes', '@chocolate', '@cookie', '@cotton', '@cream',
                                '@cupcake', '@danish', '@donut', '@dragée', '@fruitcake', '@gingerbread', '@gummi', '@ice', '@jelly-o',
                                '@liquorice', '@macaroon', '@marzipan', '@oat', '@pie', '@plum', '@pudding', '@sesame', '@snaps', '@soufflé',
                                '@sugar', '@sweet', '@topping', '@wafer'
                            ],
                            minimumCharacters: 1
                        }
                    ]
                },
                // The "super-build" contains more premium features that require additional configuration, disable them below.
                // Do not turn them on unless you read the documentation and know how to configure them and setup the editor.
                removePlugins: [
                    // These two are commercial, but you can try them out without registering to a trial.
                    // 'ExportPdf',
                    // 'ExportWord',
                    'CKBox',
                    'CKFinder',
                    'EasyImage',
                    // This sample uses the Base64UploadAdapter to handle image uploads as it requires no configuration.
                    // https://ckeditor.com/docs/ckeditor5/latest/features/images/image-upload/base64-upload-adapter.html
                    // Storing images as Base64 is usually a very bad idea.
                    // Replace it on production website with other solutions:
                    // https://ckeditor.com/docs/ckeditor5/latest/features/images/image-upload/image-upload.html
                    // 'Base64UploadAdapter',
                    'RealTimeCollaborativeComments',
                    'RealTimeCollaborativeTrackChanges',
                    'RealTimeCollaborativeRevisionHistory',
                    'PresenceList',
                    'Comments',
                    'TrackChanges',
                    'TrackChangesData',
                    'RevisionHistory',
                    'Pagination',
                    'WProofreader',
                    // Careful, with the Mathtype plugin CKEditor will not load when loading this sample
                    // from a local file system (file://) - load this site via HTTP server if you enable MathType
                    'MathType'
                ]
            });
        </script>
    </body>
</html>