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Replying to @utopiah

VR headsets are not required, one can join with their mobile phone.

Also this is done offline, the RPi is a open access point, following https://www.raspberrypi.com/documentation/computers/configuration.html#setting-up-a-routed-wireless-access-point without WPA, serving the @ImmersiveWebW3C content and networking between devices.

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