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Goodnotes is already doing it. Their web app runs a large amount of the same Swift code used by their iOS app inside the browser through WebAssembly.

Goodnotes wrote about their WebAssembly work on the Swift blog earlier this year: https://www.swift.org/blog/bringing-goodnotes-to-web-with-sw...

From that post: "Shared Swift code: 1.47 million lines (66% of the web app, 34% of the iOS app)"