Semantic HTML has excellent potential. I personally like the style where footnotes for running text are placed in the right-side margin, in a smaller and/or sem

Semantic HTML has excellent potential. I personally like the style where footnotes for running text are placed in the right-side margin, in a smaller and/or semi-greyed font, and maybe with details/summary expanders. But every implementation of styles like this seem to require some sort of detailed knowledge of CSS to wrangle it into working order.