WASM

• wasm is a target language for compilers.
• There are wasm runtimes that execute wasm binaries
• firefox, chrome etc all have wasm runtimes but thats just the original purpose.You can actually have wasm targets for embedded devices, mobile phone etc. So in many ways wasm is a containerization technology and also a truly cross platform target.
• If your language targets wasm (zig does) and if a suitable runtime exists, then the code is portable to any platform.

Docker + wasm

Docker now has experimental support for wasm