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chromium/third_party/blink/web_tests/external/wpt/orientation-event/orientation/create-event.https.html 

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
'use strict';

test(test => {
  const event = document.createEvent('DeviceOrientationEvent');
  const newEvent = new CustomEvent("deviceorientation", {
      bubbles: false, cancelable: false,
      alpha: 1.0,
      beta: 2.0,
      gama: 3.0,
      absolute: false
  });

  assert_equals(typeof event, 'object');
  assert_equals(Object.getPrototypeOf(event), DeviceOrientationEvent.prototype);

  assert_true('type' in event);
  assert_true('bubbles' in event);
  assert_true('cancelable' in event);
  assert_true('alpha' in event);
  assert_true('beta' in event);
  assert_true('gamma' in event);
  assert_true('absolute' in event);

  assert_equals(typeof event.type, 'string');
  assert_equals(typeof event.bubbles, 'boolean');
  assert_equals(typeof event.cancelable, 'boolean');
  assert_equals(typeof event.alpha, 'object');
  assert_equals(typeof event.beta, 'object');
  assert_equals(typeof event.gamma, 'object');
  assert_equals(typeof event.absolute, 'boolean');

  assert_equals(newEvent.type, "deviceorientation");
  assert_false(newEvent.bubbles);
  assert_false(newEvent.cancelable);
}, 'Tests that document.createEvent() works with DeviceOrientationEvent.');
</script>