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See this: https://news.ycombinator.com/item?id=32610129

I think so. They use Emscripten to compile.

Remarkable.

It uses wxwidgets so they can just compile that to webassembly too.

wxWidgets uses native controls, so just compiling to "WebAssembly" (I'm assuming it's compiled to WebAssembly, plus some JavaScript for DOM manipulation) was probably a significant amount of work. I'm actually curious how it was done!

Edit: the previous submission had a helpful thread on this very topic: https://news.ycombinator.com/item?id=32689423