@blainsmith There roughly was the idea of microformats, i.e. that you could use html + spans + class names to create lightweight specs for movie reviews etc. It didn't catch on.
The general idea is so useful that when I'm coding up side projects, I ask the bot to invent a DSL & write the code to parse it, e.g. https://github.com/matthewdeanmartin/fermi_problems/blob/main/files/piano.txt which is my incomplete effort to make a machine readable fermi problem format.