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For example, the following text should describe the device you're using: You are on a desktop machine.You are on a tablet device.You are on a smartphone like an iPhone or Android phone.

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This example uses the opposite rules, so the following text should describe the device you're using: You are not on a desktop machine.You are not on a tablet device.You are not on a smartphone like an iPhone or Android phone.

Each of these classes have an implied 'only' as in 'show only on tablet' or 'hide only on phones'.

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