> the subset that it optimized for would still be C This doesn't mean to imply the subset is the entirety of C; it means the subset is part of the definition o

> the subset that it optimized for would still be C This doesn't mean to imply the subset is the entirety of C; it means the subset is part of the definition of C — just like you can say "'int x = 4;' is C", even though it's a (demonstration of a) subset of C. The JavaScript which happens to be optimised under the name "asm.js" is still JavaScript that executes in any non-optimising runtime, and the semantics with those optimisations and without are the same.