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> it's the write once run anywhere that's been promised so many times.

It has yet to even obtain Java-level "write once, debug everywhere". Most of the people talking about "isomorphic JS" and "JS is everywhere" use, and expect, a single javascript VM implementation (V8).

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i was under the impression that jQuery had taken care of that, perhaps i was mistaken. certainly a url is quicker to deploy than a jar.

with the exception of jQuery: i appreciate your point, even within the same browser, different js engine versions have wildly different behaviour.

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