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chromium/third_party/blink/web_tests/external/wpt/navigation-api/ordering-and-transition/transition-cross-document.html 

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

<iframe id="i" src="/common/blank.html"></iframe>

<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(r => window.onload = () => t.step_timeout(r, 0));

  i.contentWindow.navigation.onnavigatesuccess = t.unreached_func("navigatesuccess must not fire");
  i.contentWindow.navigation.onnavigateerror = t.unreached_func("navigateerror must not fire");

  assert_equals(i.contentWindow.navigation.transition, null);
  i.contentWindow.navigation.reload();
  assert_equals(i.contentWindow.navigation.transition, null);

  await new Promise(r => i.onload = () => t.step_timeout(r, 0));
}, "cross-document reload() must leave transition null");

promise_test(async t => {
  i.contentWindow.navigation.onnavigatesuccess = t.unreached_func("navigatesuccess must not fire");
  i.contentWindow.navigation.onnavigateerror = t.unreached_func("navigateerror must not fire");

  assert_equals(i.contentWindow.navigation.transition, null);
  i.contentWindow.navigation.navigate("?1");
  assert_equals(i.contentWindow.navigation.transition, null);

  await new Promise(r => i.onload = () => t.step_timeout(r, 0));
}, "cross-document navigate() must leave transition null");

promise_test(async t => {
  i.contentWindow.navigation.onnavigatesuccess = t.unreached_func("navigatesuccess must not fire");
  i.contentWindow.navigation.onnavigateerror = t.unreached_func("navigateerror must not fire");

  assert_equals(i.contentWindow.navigation.transition, null);
  i.contentWindow.navigation.back();
  assert_equals(i.contentWindow.navigation.transition, null);

  await new Promise(r => i.onload = r);
}, "cross-document back() must leave transition null");
</script>