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Re:ET-Jekyll: Edward Tufte-inspired Jekyll theme by slater on Saturday June 05, 2021 @03:49PM (#27407987)
ET Book, the font used on the page, is free and open-source:

https://edwardtufte.github.io/et-book/

Modern browsers also have preferences to switch off web fonts.

Re:ET-Jekyll: Edward Tufte-inspired Jekyll theme by divbzero on Saturday June 05, 2021 @04:00PM (#27408053)
The main downside of custom web fonts isn’t the licensing but having to download those fonts to render the page. There are ways to optimize font loading [1] but it can still lead to delay in rendering or font swaps.

It looks like ET-Tufte has already considered and tried to mitigate this downside. [2]

[1]: https://web.dev/optimize-webfont-loading/

[2]: https://et-jekyll.netlify.app/et-jekyll-theme/#performance

Re:ET-Jekyll: Edward Tufte-inspired Jekyll theme by mrunseen on Saturday June 05, 2021 @05:33PM (#27408633)
Licensing is a issue[0] in commercial fonts, though.

[0]https://twitter.com/typographica/status/1395769805542547461?...