WebAssembly can be run in-process rather than requiring a process switch, and it can be easier to port library code to run inside a WebAssembly sandbox than a c

WebAssembly can be run in-process rather than requiring a process switch, and it can be easier to port library code to run inside a WebAssembly sandbox than a completely separate process. Also, sandbox mechanisms for separate processes are not always as robust, since they have to give access to any direct syscalls the process makes, whereas WebAssembly completely insulates a library from any native surface area.