title: Why are values for DeviceMotionEvent's accelerationIncludingGravity different between iOS and Android?
body: <p>I have a page that looks at motion events.  For some reason, the values returned on iOS devices vs Android devices (Galaxy S4 specifically) are different - essentially opposite of one another.  </p>
  
  <p>So for example if, <code>accelerationIncludingGravity.y</code> is 50 on the iPhone 5s, it'll be -50 on the Galaxy S4.  I've created a <a href="http://jsfiddle.net/kaF8k/" rel="nofollow">jsFiddle</a> to demonstrate the problem.  </p>
  
  <p>My questions:</p>
  
  <ol>
  <li>Am I missing something simple?</li>
  <li>Which device is correct?</li>
  </ol>