Mermaid
Official Example
Mermaid in draw.io
Blog - Use Mermaid syntax to create diagrams
CDN
<script src=”https://cdnjs.cloudflare.com/ajax/libs/mermaid/8.3.1/mermaid.min.js"></script>
Include Mermaid
<script src="https://cdnjs.cloudflare.com/ajax/libs/mermaid/8.3.1/mermaid.min.js"></script>
<script>mermaid.initialize({startOnLoad:true});</script>
Example
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
</head>
<body>
<div class="mermaid">
graph LR
A --- B
B-->C[fa:fa-ban forbidden]
B-->D(fa:fa-spinner test);
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/mermaid/8.3.1/mermaid.min.js"></script>
<script>mermaid.initialize({startOnLoad:true});</script>
</body>
</html>