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@Gorsefan @ChromiumDev Nice, thanks for the reply (example URL?)!
DLis what the HTML 3.0 example (blog.tomayac.com/2021/01/24/ruby-html-footnotes/#footnotes-in-html%2C-then-and-now) used, too. I know progressive enhancement is perfectly possible with JavaScript. I am especially interested in pure HTML+CSS solutions.