Automerge is a JSON-like data structure (a CRDT) that can be modified concurrently by different users, and merged again automatically. It is a library of data structures for building collaborative applications in JavaScript.
You may also be interested in ...
How to Use CSS Math Functions
Introduction to CSS logical functions calc(), clamp(), min() and max().
Mermaid
Generation of diagram and flowchart from text in a similar manner as markdown.
Prism
Prism is a lightweight, extensible syntax highlighter, built with modern web standards in mind. It’s used in thousands of websites, including some of those you visit daily.