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I love this. Once I realized what was happening, I felt like you had played a great trick on me. I chuckled.

Same. Reminds me of when I was a child playing videogames. I knew that animation was a series of still pictures, so I assumed every possible image the game could show had to be pre-rendered and shown at the right time, which is exactly what's been done here!

Nice.

>only single digits are supported

Semi-random idea, add "A suffusion of yellow ...", replicating Dirk Gently's calculator:

https://www.urbandictionary.com/define.php?term=A%20Suffusio...

There used to be a replica online, but it is unfortunately dead:

http://www.thateden.co.uk/dirk/

https://web.archive.org/web/20180603190031/http://www.thated...

https://web.archive.org/web/20180810204739/http://www.thated...

Very interesting. It reminds me of template metaprogramming in C++ as (assuming you generated this, and didn't write it by hand) the computations were completed at compile time!

https://en.wikipedia.org/wiki/Template_metaprogramming#Compi...

OK, but why?

Primarily for amusement, I believe

Simple calculator written in pure HTML (no script) – proof of concept