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Chrome on a Mac here. Did anyone else's ENTIRE SCREEN fade to black for a second upon loading this page? How is that possible?

Nope.

OS X 10.12.6 Beta (16G8c)

Chrome Version 61.0.3163.100 (Official Build) (64-bit)

Off topic: That beta is very buggy and you should consider updating to a more recent one.

GPU crash, maybe?