Is JavaScript guaranteed to be single-threaded?

Question

JavaScript is known to be single-threaded in all modern browser implementations, but is that specified in any standard or is it just by tradition? Is it totally safe to assu

Answer 1

Well, Chrome is multiprocess, and I think every process deals with its own Javascript code, but as far as the code knows, it is "single-threaded".

There is no support whatsoever in Javascript for multi-threading, at least not explicitly, so it does not make a difference.