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SDL API is used to interface with HTML5 canvas operations so that SDL doesn't need to be compiled: the entire SDL API is literally a primitive in your browser.

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That is not true, SDL2 port is written in C and it has to be compiled.

Here's where it's built

https://github.com/emscripten-core/emscripten/blob/main/tool...

Half true. Emscripten implements (much of) the SDL 1.2 (and also SDL_mixer 1.2) API in Javascript here: https://github.com/emscripten-core/emscripten/blob/main/src/.... On the other hand SDL 2 (and SDL_mixer 2) are proper ports (which you linked to).

So there's quite a size penalty to using SDL 2 rather than SDL 1.2, but the reimplemented SDL[_mixer] 1.2 is incomplete and differs from official.

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