This changed back when 10.9 was released: http://support.apple.com/kb/HT5869 | Hacker News

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		acdha on Feb 25, 2014 \| parent \| context \| favorite \| on: Apple releases OS X Mavericks 10.9.2 with SSL fix This changed back when 10.9 was released: http://support.apple.com/kb/HT5869

randomdata on Feb 25, 2014 [–]

The parent is correct. In 10.9, pressing the power button put the computer to sleep, replacing the dialog prompt shown in your link. As of 10.9.2, simply pressing it does nothing at all.

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