We had this in the early 1990's, it was called Mathematica [0]

[0] - https://writings.stephenwolfram.com/2013/06/there-was-a-time...

It was eye-wateringly expensive and required a high-end system, though. It was good, and I liked it too, but it's not the same as being usable from pretty much anywhere for $0.

Not just running right there and re-rendering in the browser you didn't.

We got alone fine for decades without browsers.

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