https://github.com/CondeNast/atjson

They're using annotations in this context more like CSS, but instead of adding the markup into the content as is done in HTML and processing it, they've physically separated the text and the markup entirely and are using location within the text to indicate where the formatting should take place.

I suppose this is also an argument that Python tries to make? That other languages have this con:

• cons: closing tags make it more verbose / increase duplication and that Python is simpler / more concise because it uses indentation instead of closing delimiters like end or } ?