Bac à sable
On affiche le code html avec la coloration
<link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/highlightjs/cdn-release@11.9.0/build/styles/github-dark.min.css">
<script src="https://cdn.jsdelivr.net/gh/highlightjs/cdn-release@11.9.0/build/highlight.min.js"></script>
<script>
hljs.configure({cssSelector: '.code pre'});
hljs.highlightAll();</script>