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chromium/third_party/blink/web_tests/external/wpt/navigation-api/navigation-history-entry/key-id-back-cross-document.html 

<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<iframe id="i" src="resources/key-navigate-back-cross-document-helper.html"></iframe>
<script>
async_test(t => {
  let start_length = navigation.entries().length;
  window.finish = t.step_func_done((end_key, end_id) => {
    assert_equals(window.start_key, end_key);
    assert_equals(window.start_id, end_id);
    // The new history entry in the iframe should not add any entries to
    // this window's navigation.
    assert_equals(navigation.entries().length, start_length);
  });
}, "NavigationHistoryEntry's key and id on cross-document back navigation");
</script>