“popups.js”, Said Achmiz2019-08-21 (JS, typography, Wikipedia; backlinks; similar)⁠:

popups.js: standalone Javascript library for creating ‘popups’ which display link metadata (typically, title/author/date/summary), for extremely convenient reference/abstract reading, with mobile and YouTube support. Whenever any such link is mouse-overed by the user, popups.js will pop up a large tooltip-like square with the contents of the attributes. This is particularly intended for references, where it is extremely convenient to autopopulate links such as to Arxiv.org/Biorxiv.org/Pubmed/PLOS/gwern.net/Wikipedia with the link’s title/author/date/abstract, so the reader can see it instantly.

popups.js parses a HTML document and looks for <a> links which have the link-annotated attribute class, and the attributes data-popup-title, data-popup-author, data-popup-date, data-popup-doi, data-popup-abstract. (These attributes are expected to be populated already by the HTML document’s compiler, however, they can also be done dynamically. See wikipedia-popups.js for an example of a library which does Wikipedia-only dynamically on page loads.)

For an example of a Hakyll library which generates annotations for Wikipedia/Biorxiv/Arxiv/PDFs/arbitrarily-defined links, see LinkMetadata.hs.

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