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chromium/third_party/blink/web_tests/external/wpt/navigation-api/navigation-methods/return-value/resources/navigate-opaque-origin-page.html 

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="helpers.js"></script>
<!-- Put this page in a sandbox to give it an opaque origin -->

<script>
promise_test(async t => {
  navigation.onnavigate = t.unreached_func("onnavigate should not be called");
  navigation.onnavigatesuccess = t.unreached_func("onnavigatesuccess should not be called");
  navigation.onnavigateerror = t.unreached_func("onnavigateerror should not be called");

  const result = navigation.navigate("#1");
  assertNeverSettles(t, result);
  await new Promise(resolve => t.step_timeout(resolve, 10));
}, "navigation.navigate() in an opaque origin iframe");
</script>