Your demo works on Asus Transformer Prime Android Browser running the latest firmware.
Thanks for the report, will add this to the supported browser/device list :)
While we're at it:
Working on the Nexus S with 4.0.3 in the following browsers:
Not working on this device in:
Much appreciated, thanks :)
I guess it depends on which browsers support devicemotion api, but will investigate chrome and firefox :)
Not working in Chrome is surprising because it should include devicemotion:
http://www.mobilexweb.com/blog/google-chrome-android-html5 (at the bottom)
So it could be caused by something else or it's just the usual beta problems with the implementation
Will investigate, thanks - a bit difficult though as I currently don't have an Android 4.x device with Chrome to test on.