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chromium/third_party/blink/web_tests/external/wpt/navigation-api/navigation-history-entry/state-after-navigate-restore.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 => {
  await new Promise(resolve => window.onload = resolve);
  await i.contentWindow.navigation.navigate("#start", { history: "replace", state: "someState" });
  assert_equals(i.contentWindow.navigation.entries().length, 1);
  assert_equals(i.contentWindow.navigation.entries()[0].getState(), "someState");

  await i.contentWindow.navigation.navigate("#foo");
  assert_equals(i.contentWindow.navigation.entries().length, 2);
  assert_equals(i.contentWindow.navigation.entries()[0].getState(), "someState");

  i.contentWindow.navigation.navigate("/common/blank.html?bar");
  await new Promise(resolve => i.onload = resolve);
  assert_equals(i.contentWindow.navigation.entries().length, 3);
  assert_equals(i.contentWindow.navigation.entries()[0].getState(), "someState");

  i.contentWindow.navigation.back();
  await new Promise(resolve => i.onload = resolve);
  assert_equals(i.contentWindow.navigation.entries().length, 3);
  assert_equals(i.contentWindow.navigation.currentEntry.index, 1);
  assert_equals(i.contentWindow.navigation.entries()[0].getState(), "someState");
}, "entry.getState() is properly restored after cross-document back");
</script>