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This feature is not on a current W3C standards track, but it is supported on the Firefox OS platform. Although implementations may change in the future and it is not supported widely across browsers, it is suitable for use in code dedicated to Firefox OS apps.
icon property is a string indicating which kind of icon could be used to represent the device.
var icon = instanceOfBluetoothDevice.icon
Return a string, one of the following:
Not part of any specification yet. It should be discussed as part of the W3C's System Applications Working Group.