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 … ...

And they don't say the random number generator function in JavaScript -- Math.random () -- is broken. They say it "offers sub-par quality." Specifically, V8 used a pseudorandom number generator (PRNG) ...

December 17, 2015 - 2:45 pm Over the years, multiple studies have found that Google Chrome’s V8 JavaScript engine was returning not-so-random numbers when you called the Math.random () function.

Bierhorst told Gizmodo that perhaps there’s a future in which something relying on this method could be scaled down. On the shorter scale, perhaps they can integrate it into the random number ...