Hey, I came up with a solution for Godot C# HTML5 Export (it’s uses a slightly modified libgodot, in a free and open source nuget package) Web / Browser (WebAssembly) 🦴 Godot in .NET
Would love to get feedback or issue reports on our github, or questions here or elsehere if you can get a hold of me. 
Read the docs at https://2dog.dev - you can do a lot more with it, like unit testing or embedding in a WinForms (and soon Avalonia) UI.
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This looks very interesting, especially embedding in WinForms, that gives me a lot of cool ideas! Thank you!
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Thanks. I’m currently working on a proof of concept for an Avalonia UI control as well, that would allow rendering UI over the control (in WinForms, I use Godot’s --wid parameter which merely creates a fake embedded window handle)
I recently shipped Avalonia UI support:
Soon:
I built it as a dedicated host due to some polyfill fuckery that was unfortunately necessary; GodotSharp does not support WebXR due to .NET’s wasm-tools emscripten being from circa 1938 (colorized).