Thank you for csvbase, today is the first time I've seen it.
I believe PapaParse, a JS library for parsing CSV files, uses Content-Range to stream large CSV files in chunks.
https://csvplot.com uses PapaParse under the hood, I saw a warning in the dev console and posted here. I'm not sure why it seemingly works fine anyway.
I will look into implementing Content-Range - what is it that you want that for? What's the usecase?