JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//cdn.ckeditor.com/4.5.7/standard/ckeditor.js"></script>
<textarea id="container">How are you!</textarea>

JavaScript

editor = CKEDITOR.replace('container')
editor.addCommand("mySimpleCommand", {
    exec: function(edt) {
        alert(edt.getData());
    }
});
editor.ui.addButton('SuperButton', {
    label: "Click me",
    command: 'mySimpleCommand',
    toolbar: 'insert',
    icon: 'https://avatars1.githubusercontent.com/u/5500999?v=2&s=16'
});