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chromium/third_party/blink/web_tests/external/wpt/webxr/navigator_xr_sameObject.https.html 

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/webxr_util.js"></script>
<script src="resources/webxr_test_constants.js"></script>

<script>
let testName = "Navigator.xr meets [SameObject] requirement";

let testFunction = function(session, fakeDeviceController, t) {
  let xr = navigator.xr;

  return new Promise((resolve) => {
    // Make sure the navigator.xr object is the same on each frame.
    session.requestAnimationFrame((time, xrFrame) => {
      t.step(() => {
        assert_equals(navigator.xr, xr, "navigator.xr returns the same object");
      });
      session.requestAnimationFrame((time, xrFrame) => {
        t.step(() => {
          assert_equals(navigator.xr, xr,
            "naivgator.xr returns the same object");
        });
        resolve();
      });
    });
  });
};

xr_session_promise_test(
  testName, testFunction, TRACKED_IMMERSIVE_DEVICE, 'immersive-vr');
</script>