Not sure about saving but, more importantly for me, it can read sqlite DBs, which has been a godsend whenever I need to take a quick glance at some random DB just to see what kind of tables it holds and what does the data look like. I know my SELECTs but I can't, for the life of me, remember what are the commands to check schemas and DB metadata on sqlite ("Was it .describe? Maybe .schema? Or perhaps \t? Gah, let's check the help once again..."), so knowing that visidata gets me there much faster feels good.
That over there blew my mind, and I had to go back to the page to double-check that. And indeed, it's all clever CSS trickery. Digging further into the source, I found that this was generated using the ansi2html [1] library which I had never heard about before. Thanks for the TIL!
> Also looks powerful in it's own right
If you aren't convinced of that yet, I'd simply suggest to take a look at this lightning demo (~5 mins): https://www.youtube.com/watch?v=N1CBDTgGtOU