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Re:Fullscreen in Mountain Lion still renders second display ... by bluetidepro on Thursday July 12, 2012 @02:22PM (#4235869)
This has always drove me crazy.

Some apps, like Mail or Spotify (for example), do actually go full screen when I click the green button to maximize. Other apps, like you mentioning Chrome, don't. This makes me believe it has to do with how the app is coded, not a OSX problem.

Re:Fullscreen in Mountain Lion still renders second display ... by spudlyo on Thursday July 12, 2012 @03:05PM (#4236118)
What drives me crazy is that sometimes running youtube videos in full-screen mode under Chrome will sometimes initiate the Lion full-screen behavior, and sometimes it won't. If there is a rhyme or reason behind it, I don't know it.
Re:Fullscreen in Mountain Lion still renders second display ... by danabramov on Thursday July 12, 2012 @04:19PM (#4236548)
I believe this has to do with whether you're running a Flash or HTML5 video. I thought HTML5 triggers Lion fullscreen, although I'm not sure.