The spec is explicitly not for keyboards: Standard device classes include keyboard, mice, audio, video and storage devices. Operating systems support such devi

The spec is explicitly not for keyboards: Standard device classes include keyboard, mice, audio, video and storage devices. Operating systems support such devices using the "class driver" provided by the OS vendor. There is however a long tail of devices that do not fit into one of the standardized device classes. These devices require hardware vendors to write native drivers and SDKs in order for developers to take advantage of them and this native code prevents these devices from being used by the web.