mattdsteele/gist:5615925

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Quirks in DeviceOrientation API

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gistfile1.md

Testing the DeviceOrientation API

Test case: http://jsfiddle.net/TPz2G/2/show/

Nexus S, Android 4.1.1

Firefox Beta 22.0

Alpha increases when rotating device clockwise
Alpha is at 0° when device is exactly south

Chrome Beta 27.0.1453.90

Alpha increases when rotating device counterclockwise
Alpha is at 0° when device is approximately south

Android Browser 4.1.1

Alpha increases when rotating device counterclockwise
Alpha is at 0° when device is exactly east

Opera Mobile 12.1.4

Alpha increases when rotating device counterclockwise
Alpha is at 0° when device is exactly south

iPhone 5, iOS 6.1.4

Mobile Safari

Alpha increases when rotating device counterclockwise
Alpha is at 0° where the page loads
Includes webkitCompassHeading property, which is at 0° when device is north
webkitCompassHeading increases when rotating device clockwise

Chrome 26.0.1410.53

Same as Mobile Safari

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