Add the security-privacy-self-assessment for Origin Trial #110
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security-privacy-self-assessment.md
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| ### 2.1. What information might this feature expose to Web sites or other parties, and for what purposes is that exposure necessary? | ||
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| This API exposes the posture of the device, a physical state of a device. The posture typically apply only to device with a foldable screen or dual screens devices (devices with two screens connected with a physical hinge). The posture is typically derived from the hinge angle sensor but also few other sensors (for example if the keyboard is detached or not). |
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but can include data from other sensors as well?
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Typically the OS will take many inputs : hinge angle, keyboard docking state, kick stand state, window position etc etc and determine the posture. None of the decision making is done in the spec, certainly not exposed. As a matter of fact we should remove https://www.w3.org/TR/device-posture/#foldables and replace that with a section that explains how the posture could be derived, more like a FYI.
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On Android for example https://www.w3.org/TR/device-posture/#foldables isn't true if the browser window is running on an external screen (the OS tells us continuous), despite the device being physically folded. Also on Android if you do a side by side app window (like say the browser and another app) the OS will tell us "continuous" because really there isn't much value in trying to layout stuff in half the screen.
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you say, it is typically derived from the hinge angle sense, but then you also say a few other sensors... so is it always derived from all of these?
The posture is typically derived from the hinge angle sensor, but additional data can be used to determine the posture such as whether the keyboard is attached or not.
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On Android it's hinge angle + window state. On Windows, it's Hinge Angle + other sensors.
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But I don't think we should enter the specifics of each OS so let's keep generic. I think actually saying the posture is computed using a set of sensors sounds better.
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