According to this post on the official V8 Javascript blog, the pseudo-random number generator (PRNG) that V8 Javascript uses in Math.random() is horribly flawed and getting replaced with something a ...

On the other hand, the weakness of many implementations mean that a sequence of outputs of Math.random can often be predicted, even when the intent was that it could not. This may present security ...

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So it turns out the random number generator long used by developers working with Google's V8 JavaScript engine doesn't really generate random numbers at all. That's being fixed in the latest release ...