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The original SDL support was a JavaScript implementation of just enough of 1.x to get things compiling.

SDL2 cross-compiles to JavaScript properly and should be used by most things now.

so emscripten provides the sdl binding? I was assuming it'd cover libc, but does that mean it's part of the ecosystem or the compiler?

I feel like I'm just asking dumb toolchain questions because I'm missing something fundamental about targeting an executable build to the browser.

I think this is what you are missing.