mozilla-release/testing/web-platform/tests/orientation-event/screen-upmost-manual.https.html

<!DOCTYPE html>
<html>
  <head>
    <title>DeviceMotionEvent: A device lying flat on a horizontal surface with the screen upmost</title>
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <link rel="author' title='Mosquito FP7">
    <link rel="reviewer author" title="Zhiqiang Zhang" href="mailto:zhiqiang.zhang@intel.com"> <!-- 2013-10-14 -->
  </head>
  <body>
    <p>Put the device on a horizontal surface with the screen upmost.</p>
    <div id="log"></div>
    <script>
      var t = async_test();
      var run = false;

      /*
       * A device lying flat on a horizontal surface with the screen upmost
       * has an acceleration of zero and the following value for
       * accelerationIncludingGravity:
       * {
       *   x: 0,
       *   y: 0,
       *   z: 9.81
       * };
       */
      window.addEventListener("devicemotion", function(e) {
        if (!run) {
          run = true;
          t.step(function() {
            var gvt = e.accelerationIncludingGravity;
            var acc = e.acceleration;
            var rot = e.rotationRate;

            assert_approx_equals(gvt.x, 0, 1);
            assert_approx_equals(gvt.y, 0, 1);
            assert_approx_equals(gvt.z, 9.81, 1.5);

            assert_approx_equals(acc.x, 0, 1);
            assert_approx_equals(acc.y, 0, 1);
            assert_approx_equals(acc.z, 0, 1);

            assert_equals(rot, null);
          });
          t.done();
        }
      }, false);
    </script>
  </body>
</html>