I'd have to look more into it, one thing for sure is that Tenno does not try to be something like Jupyter. The cells execution order is sorted out for you.

Observable also handles the execution order for you.

Specifically, this brings to mind Observable Framework, which takes the "jupyter-like" UI of observablehq.com and makes a static site generator out of it, where you write Markdown, and add "reactive Javascript" bits to it: https://observablehq.com/framework/. (see https://observablehq.com/framework/javascript specifically)

Note that there's nothing stopping you from embedding the Obervable runtime straight into scripts littered throughout a HTML document, see https://maxbo.me/celine/ (my own work).

I’m the lead dev on quarto.org. I’m aware - I designed and implemented our observablehq integration.

haha what a coincidence - I love Quarto and have used the Observable integration! Thank-you for your work and efforts.