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See asm.js. This is exactly what you propose.

BTW, asm.js has been superseded by Webassembly which ditches Javascript completely.

As I understand Webassembly, it's meant to replace JS completely as a native implementation in a browser. That is, it's meant to replace the JS interpreter.

Not sure if I understood it correctly though.

Not exactly.

The browser, instead of downloading javascript, downloads WASM bytecode, and this bytecode gets compiled ahead-of-time to machine language and ran by the browser.

The bytecode itself is the product of compiling a source code written in the language of your choice, for example Java or something more advanced like INTERCAL.

I see, that makes sense. The bytecode part still has to be implemented in a browser though, right?

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