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If you love that idea but don't mind the switching out the language, CLOG [1] does this on Common Lisp.

[1] https://github.com/rabbibotton/clog

PharoJS?

https://pharojs.org/

Cuis Smalltalk (https://cuis.st) uses vector graphics for its rendering engine!

you mean like amber smalltalk?

https://www.amber-lang.net/

https://en.wikipedia.org/wiki/Amber_Smalltalk

or more like https://squeak.js.org/ ?

https://squeak.js.org/demo/simple.html this is canvas not DOM/SVG. It doesn't support fonts/text. Its text support feels less janky than I expected, select, copy, paste work, but it is still not browser-native.

I don't know how to start Amber in the browser and couldn't find demos.

> https://squeak.js.org/demo/simple.html

Why is this thing so fast? I type 3 + 4, hit alt+p and the result appears instantly! (Or the better question: why are all the other things so slow?) I submitted it to <https://news.ycombinator.com/item?id=50259214>!

https://github.com/LivelyKernel/lively4-core

https://lively-kernel.org/lively4/lively4-core/start.html

?