Honestly, I think it might be worthwhile to stop worrying about getting native 2D UIs working cross platform using "native UI elements" and jump straight to 3D rendering with accessibility API integration. 🤷
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Thinking about this blog post I never published: https://blog.mauve.moe/posts/stripped-down-browsers.md
Might be cool to revisit it (before I was looking from a Node.js approach, now I'm not sure).
@mauve this also sounds like something Constellation would help with, a set of tools that can let content be 1-click runnable anywhere (native or web)... it's another project I'm working on but it's on the backburner right now due to Stardust being more important IMO.