SPIR-V is an IR and isn't designed to be human writable, so you still need a higher level language, like OpenCL, to emit it. If browsers had a standard way to

SPIR-V is an IR and isn't designed to be human writable, so you still need a higher level language, like OpenCL, to emit it. If browsers had a standard way to consume a language independent IR, although SPIR-V might not be the most suitable of those available, then that would enable the broader idea of language agnosticism that you suggest.