How is Math.Random emulated? and how good is it?

I have been playing about drawing fractals in GWT using canvas and the
¨ chaos game¨ method.

However when picking large amounts of random numbers I seem to be
getting a bias. That is, the randomness doesn't seem evenly
distributed.
I have read many sources online that say that Javas normal
Math.Random() is flawed for this stuff, and some alternatives are
offered. However as GWTś Math.Random is merely an emulation, I
wondered if it suffered the same flaws or not.
Does anyone use alternative methods?

This is all rather new too me, so if anyone has any pointers it would
be helpfull.

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