Markdown by definition compiles to HTML and must be rendered by a browser as HTML. This seems to be a widely overlooked fact in this thread. It's fine to write

Markdown by definition compiles to HTML and must be rendered by a browser as HTML. This seems to be a widely overlooked fact in this thread. It's fine to write MD, but know that it's a limited and shortcut form for the real HTML that will be output and rendered. The short form is great for short stuff but to access the full power of HTML and CSS takes really messy spaghetti MD. And don't even start with JS or TS. Modern sites usually need code and that means web components and that means real HTML and all of CSS need to be present and accessible in an orthogonal way -- not some via MD syntax and some with HTML glommed-onto MD.