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chromium/third_party/blink/web_tests/external/wpt/navigation-api/state/cross-document-away-and-back.html 

<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<iframe id="i" src="/common/blank.html"></iframe>
<script>
async_test(t => {
  window.onload = t.step_func(() => {
    i.contentWindow.navigation.navigate("#", { history: "replace", state: { data : "value" } });
    assert_equals(i.contentWindow.navigation.entries().length, 1);
    assert_equals(i.contentWindow.navigation.currentEntry.getState().data, "value");

    let navigated_back = false;
    i.contentWindow.navigation.navigate("?1");
    i.onload = t.step_func(() => {
      if (navigated_back) {
        let back_entry = i.contentWindow.navigation.currentEntry;
        assert_equals(i.contentWindow.navigation.entries().length, 2);
        assert_equals(back_entry.index, 0);
        assert_equals(back_entry.getState().data, "value");
        t.done();
      } else {
        assert_equals(i.contentWindow.navigation.entries().length, 2);
        assert_equals(i.contentWindow.navigation.currentEntry, i.contentWindow.navigation.entries()[1]);
        assert_equals(i.contentWindow.navigation.currentEntry.getState(), undefined);
        history.back();
        navigated_back = true;
      }
    });
  });
}, "entry.getState() behavior after navigating away and back");
</script>