Since you are welcoming questions, you can save me the documentation search:

My use case involves documentation for, e.g., a software library that can be used in different languages/frameworks. The documentation is the same, but then we provide examples is different languages and we're looking for a way of elegantly presenting this.

Do you support any way of marking the original markdown so that a "switch" from the UI can present one of alternative parts?

I apologize if that is not clear -- and asking about a custom use case.