There are technical article posting sites that support extended Markdown syntax like ":::details," and this syntax is commonly adopted by existing Markdown parsers as well.

I personally don't want to write HTML within Markdown. It’s not very readable, and I believe it's better if users can write content without needing to know both Markdown and HTML.

While building a static website might require some technical expertise, the fact that content can be updated by anyone who can write Markdown—even those who aren't tech-savvy—is a significant advantage.