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My question is about the other types of media. Do they ever get automatically turned on? A computer with a projector output (like classroom setups) won't automatically use the projection CSS would it? Somebody would have to turn it on (assuming they would know to look and if their browser would even allow them -- right?).
I guess my concern is more for tv, projection and handheld medias, and not so much for tty, braille or aural. And I just assume that screen and print for the most part work fine.
Do browsers of people with set top internet boxes connected to their tv automatically look for the tv media? Do cell phone web browsers automatically look for handheld CSS?
For handheld devices, the situation is more difficult - different devices use varying combinations of "screen" or "handheld" rules. It is therefore impossible to depend on a particular behaviour from a class of devices.
The one mostly used is the printer one as you can be friendly to people needing a printout by hiding navigation allowing them soem more space to get it all fitting on as few pages as possible.