Hi! This website is rendering HTML generated by Hyde, a language I created after following the guide from Robert Nystrom's book Crafting Interpreters.
I highly recommend you check out his book if you're interested in learning about how programming languages really work.
You're reading this website from a Hyde script that is generating HTML. I implemented Hyde on top of Python -- it can be installed via pypi.
This application is hosted on Heroku using the standard Python buildpack, which installs Hyde as a dependency. From there, it uses .hy and .html.hy files in place of .html files to render webpages!
Be sure to read the About page for more info!