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chromium/third_party/blink/web_tests/external/wpt/navigation-api/navigation-methods/return-value/traverseTo-repeated.html 

<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/helpers.js"></script>

<script>
promise_test(async t => {
  // Wait for after the load event so that the navigation doesn't get converted
  // into a replace navigation.
  await new Promise(resolve => window.onload = () => t.step_timeout(resolve, 0));

  const key = navigation.currentEntry.key;
  const entry = navigation.currentEntry;
  await navigation.navigate("#1").committed;

  const result1 = navigation.traverseTo(key);
  const result2 = navigation.traverseTo(key);

  await assertBothFulfill(t, result1, entry);
  assert_not_equals(result1, result2);
  assert_equals(result2.committed, result1.committed, "committed promises must be equal");
  assert_equals(result2.finished, result1.finished, "finished promises must be equal");
}, "Repeated navigation.traverseTo() with the same key");
</script>