I like this use of side notes/footnotes at https://www.citationneeded.news/free-and-open-access-in-the-age-of-generative-ai/ . Footnotes use letters to distinguish them from numbered references, and are duplicated as side notes on large screens. I also like the “Show buttons that expand the side note” or “Include side notes after the paragraph on small screens” approaches on other sites. #webdesign #sidenotes