> That said, I support using LLVM bitcode more than asm.js myself. I think asm.js is the dying breaths of JavaScript being hailed as its rebirth.

I think asm.js has technical advantages over LLVM bitcode. Neither were really designed for this purpose (for LLVM, you must strip the undefined behavior; for JS, you must strip the high-level semantics), but at least JS has a fully specified, multi-vendor standard specifying the execution semantics. Plus asm.js has a very minimal type system and is non-SSA (while retaining high-level loop constructs that can be easily used to construct SSA without dominance frontiers if needed), both of which I think are advantages for delivering bytecode over the Web.

So providing APIs designed for C and C++ (instead of gluing it to JavaScript APIs) makes PNaCl the same as either an unsandboxed, proprietary, closed-source, non-OS-portable, non-CPU-portable Microsoft technology from the 90s, or a proprietary, closed-source Adobe technlogy from the 2000s?

I think that may be a false dichotomy.