Let’s be fair, about half of these things are provided by markdown as well:
> Tabular data using tables yes
> Illustrations with SVG yes
> Code snippets with script tags yes
> Workflows using SVG and HTML svgs yes
> Images using image tags yes
> Design data with CSS no
> Interactions using HTML elements with javascript + CSS no
> Spatial data using absolute positions and canvases no, although svgs help
That said, I can kinda get behind this ‘html, not markdown’ idea - as much as I like keeping things lean and mean, and markdown is ‘just enough’ semantics and style on top of plaintext… it can admittedly be more useful to recieve a more flavorful writeup from an LLM, if it’s going to be a piece that really requires you to engage with it, rather than just a quick read. Certainly a better fit for reports.