I like the possibilities this opens up but I'm struggling to understand how wasm is involved. I had the impression it doesn't have a user interface, but it's called by javascript instead.

https://avaloniaui.net/platforms/wasm

> Avalonia renders through Skia compiled to WebAssembly

I'd guess it builds on Skia CanvasKit and renders to an HTML Canvas element.

https://skia.org/docs/user/modules/canvaskit/