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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/USBDevice/deviceClass below:

USBDevice: deviceClass property - Web APIs

USBDevice: deviceClass property

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Experimental: This is an experimental technology
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The deviceClass read only property of the USBDevice interface one of three properties that identify USB devices for the purpose of loading a USB driver that will work with that device. The other two properties are USBDevice.deviceSubclass and USBDevice.deviceProtocol.

Value

A number.

Specifications Browser compatibility

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