Some games use gyroscope controls for aiming. This is not possible on safari due to the lack of the Gyroscope API. The standard is here: https://developer.mozilla.org/en-US/docs/Web/API/Gyroscope
As far as I can tell, we don't have a standards position issue open at this time.
I think you can use the device orientation API: developer.mozilla.org/en-US/docs/Web/API/Device_orientation_events/Detecting_device_orientation It relies on the gyroscope to get the device’s orientation.
Filed standards position request: https://github.com/WebKit/standards-positions/issues/347
It’s highly likely we will “oppose” this specification as it’s duplicative of what the Device Orientation and Motion specification already provides (as far as I can tell).