What I'm curious about is how this has been done. I don't think that the source for UT99 has been released, so does icculus have access to the source and has t

What I'm curious about is how this has been done. I don't think that the source for UT99 has been released, so does icculus have access to the source and has then ported it to emscripten, or has it been decompiled from x86 and then recompiled for WASM, or is it running on an x86 emulation layer programmed in WASM? I presume it was from source, given that everything else is prohibitively hard just for a demo like this.