Comment by sansnomme

Here's a not incomprehensive list of similar implementations of this idea: Phoenix Drab/LiveView/Texas, Razor Components, Plotly's Dash, Intercoolerjs/Unpoly (provides view layer only without websockets), Rails StimulusReflex, Ruby Fie, Python Sofi, Python Remi, Node.js Purview, Python Flexx, Python Reahl (AGPL licensed), Python Wdom.

I am sure I missed quite a few. Feel free to comment down below with any other library.