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It's an excellent talk, but IIRC the point was that hypothetical Metal language was still a subset of JavaScript. From the technology point of view WebAssembly has basically nothing to do with JavaScript, except that both are part of the web platform and commonly implemented by JavaScript engines. It's just a low-level VM which happens to be included in web browsers.


Wasm was definitely inspired by asm.js (though I think asm.js is still faster). The MVP for wasm was basically "do what asm.js does."




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