JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdn.ckeditor.com/4.7.3/standard-all/ckeditor.js"></script>
<textarea cols="10" id="editor1" name="editor1" rows="10" >Click on the &lt;strong&gt;∑&lt;/strong&gt; icon to use MathJax.
</textarea>

CSS

<script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js?config=TeX-AMS_HTML"></script>

JavaScript

CKEDITOR.replace( 'editor1', {
    extraPlugins: 'mathjax',
    mathJaxLib: 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js?config=TeX-AMS_HTML',
    height: 320
} );

if ( CKEDITOR.env.ie && CKEDITOR.env.version == 8 ) {
    document.getElementById( 'ie8-warning' ).className = 'tip alert';
}