Comment by soegaard

I wouldn't say compiling full Racket to WebAssembly is impossible. But I think the consensus is that one can't add a WebAssembly backend to the compiler in the same manner as the x86 and arm backends. These backends manipulate the stack in ways WebAssembly prohibits.

This forces an Racket implementation to make continuations explicit. And that will most likely mean a WebAssembly backend will be slower than the native backends.