More about asm.js a subset of Javascript which can be compiled to byte code on Javascript engines that recognise it. Because it is a subset, engines that don't recognise the "use asm" pragma will simply execute it with the Javascript interpreter. At least it will still run but at a fraction of the speed.

Currently it is only supported by Mozilla.

I really wish that Google put this into Chrome but they are probably too busy with NaCl to bother. Google's dominance of the browser space along with the advent of Chrome OS means that they no longer need to pay attention to innovation when it happens elsewhere.

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