Google announced that its Portable Native Client (PNaCl) solution for making native code run inside the browser will be replaced by the new cross-browser web standard called WebAssembly.
Around the same time Google introduced Chrome OS in 2011, it also announced Native Client (NaCl), a sandboxing technology that runs native code inside the browser. This was initially supposed to make Chrome OS a little more useful offline compared to only running web apps that required an internet connection. Two years later, Google also announced PNaCl, which was a more portable version of NaCl that could work on ARM, MIPS, and x86 devices. NaCl, on the other hand, only worked on x86 chips.