WebVM is a virtual Linux environment running fully client-side in the browser. It is based on CheerpX: our WebAssembly-powered x86 virtualization technology. Thanks to a powerful JIT recompilation engine, and an ext2 block-based filesystem, it makes it possible to run large-scale use cases: GCC / Clang / Python / Node.js / Ruby and many other things are supported out-of-the-box. But something impo