you mean like amber smalltalk?
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.
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