Starting with pdf.js, spiraling around shumway & zipfile.js, we'll explore what JS is already capable of, even though it never seemed practical. Then we'll go on to explain the WebAPIs to bring the "native" right in the browser (with a tinge of FxOS - so that it's not up in the air, it's already there - in fact it's so-last-FOSDEM actually). Finally, we will talk about the (near) future, and how broadway.js, asm.js (Emscripten, LLVM) et al. are going the change the web - for good!