[ymolodtsov]

Seems like a technicality to me, although I'd be happy to update the statement in the post. It's still not compiled in advance and while the technologies you described (asm.js, WebAssemly) exists most web apps discussed don't use them at all.

[RHSeeger]

Compiled JIT can be pretty similar to AOT, if the application runs for any real period of time. Generally, a JIT will try to compile any given block of code only once; so it winds up working towards the same state as something AOT.

That being said, there is a caveat that the code _can_ change for something compiled JIT, and there are inefficiencies related to that.