I tried to make a version of this using Zig once, but ran out of steam: https://cowasm.org/
You could say "Granted, there are those who use the webcam capture API, but if we compare it to HTML, CSS, JavaScript, then the webcam capture API is simply not existing anywhere near that level."
Like how not every website needs to use a webcam, not every website needs to port existing code to the web or accelerate heavy computation, which is what WASM is meant for... that doesn't mean it's not useful for ones that do. It's not supposed to replace any of HTML/CSS/JS
https://webassembly.org/docs/faq/
“Is WebAssembly trying to replace JavaScript?
No! WebAssembly is designed to be a complement to, not replacement of, JavaScript. While WebAssembly will, over time, allow many languages to be compiled to the Web, JavaScript has an incredible amount of momentum and will remain the single, privileged (as described above) dynamic language of the Web.”