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 … ...

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.

The random number generator of today begins its process with a “seed number”, which uses an algorithm to calculate a new, random number based on the seed. The next number then becomes the seed and ...

The company doesn’t directly use the random numbers from the lamps. [Joshua] explains how on a reboot, each production machine grabs a chunk of random numbers and uses it to seed its usual ...

True random number generators, on the other hand, use a real-world source to create seeds – like mouse movements, temperature, or the time between keystrokes on a keyboard.