I’ve been trying to display the test case results underneath. I’ve imported mocha and chai libraries from CDN as well.

https://codepen.io/tdimoff/pen/VwJKaYj

They are supposed to display in the mocha div:

<div id="mocha"></div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/mocha/10.2.0/mocha.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/chai/4.3.6/chai.min.js"></script>

Should I set the preprocessor to babel in CodePen settings?