It is hard to take any stylesheet seriously when their website doesn't even properly use meta color scheme tags. Also, their examples are like the opposite of normal element approaches to what you're trying to accomplish.
<blockquote><footer> for quote attribution? How does that even make sense?
I think blockquote attribution recommendations are perhaps the least stable part of the HTML spec I can think of. There have been at least three, I think at least four, completely different and mostly mutually-incompatible recommendations in the past decade. `blockquote > footer` was the recommendation a few years ago. Now they say <https://html.spec.whatwg.org/multipage/grouping-content.html...>:
> Attribution for the quotation, if any, must be placed outside the blockquote element.
… and suggest things like `blockquote + p` and `figure > blockquote + figcaption` instead. I will also note that that use of figure would have been semantically inappropriate a decade ago, when figure was supposed to be something that could reasonably be taken out of the document flow, but now that’s been downgraded to just being a self-contained unit, though it may be able to be taken by itself and it’s generally suggested that you refer to figures by their captions.
> It is hard to take any stylesheet seriously when their website doesn't even properly use meta color scheme tags.
I did my best looking at the source in my mobile browser, thinking they’d somehow misused the meta theme-color feature, but they haven’t used that at all. It seems your gripe is that they haven’t provided dark mode styles. Which is a reasonable gripe (and I provide them for my site even though I prefer light mode), but clarity is really helpful especially when criticizing someone’s work in a detailed way.
As far as the blockquote/footer tag combination, it’s definitely not ideal but it is semantically valid.
Anyway, HN has enough people quick to criticize so I’ll leave it at this: you have valid complaints about the submission, but I imagine the authors would be receptive to them as suggestions which take no more effort.
Yes, my gripe is that they are not using a prefers-color-scheme so that my browser properly uses dark mode and that some of the elements they use are not best practice. It is fair to say that I am not the most constructive person in doing so, but I also feel that by offering it as a framework they should already be aware of this.
<blockquote><footer> for quote attribution? How does that even make sense?