> small implementation differences Naaah it really doesn't seem small. Details are important. NaCl comes from the plugin world (NPAPI → PPAPI), while wasm com

> small implementation differences Naaah it really doesn't seem small. Details are important. NaCl comes from the plugin world (NPAPI → PPAPI), while wasm comes from the JS world ("removing the JS from asm.js"), and most existing JS engines have been able to just reuse their codegen/backend parts. PNaCl was based on a bad idea: "let's make a stable subset of LLVM IR". LLVM moves quickly, if you have a stable subset you'll eventually have to translate it to actual updated LLVM IR anyway. And good luck to anyone who wants to implement a simple small interpreter for that! wasm is really simple — just a close-to-metal abstract machine. No included libc, no bindings to any particular platform (there might be DOM/etc. bindings in the future, but on top of wasm, not right in the core spec).