GitHub repo is a bit more helpful, but users or building of text editors that use tree-sitter.

Or... website text editors which historically have had imperfect syntax highlighting.

Notice the Zed sponsorship.

https://github.com/bearcove/arborium

> Batteries-included tree-sitter grammar collection with HTML rendering and WASM support.

That's the best one sentence description there is and it's at the top of the Github README. I think that would fit nice at the top of https://arborium.bearcove.eu too