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chromium/third_party/blink/web_tests/external/wpt/navigation-api/navigation-history-entry/after-detach.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(resolve => window.onload = () => t.step_timeout(resolve, 0));

  let i_navigation = i.contentWindow.navigation;

  await i_navigation.navigate("#1").finished;
  await i_navigation.navigate("#2").finished;
  await i_navigation.back().finished;

  assert_not_equals(i_navigation, null);
  assert_not_equals(i_navigation.currentEntry, null);
  assert_equals(i_navigation.entries().length, 3);
  assert_true(i_navigation.canGoBack, "canGoBack");
  assert_true(i_navigation.canGoForward, "canGoForward");

  i.remove();

  assert_equals(i_navigation.currentEntry, null);
  assert_equals(i_navigation.entries().length, 0);
  assert_false(i_navigation.canGoBack);
  assert_false(i_navigation.canGoForward);
}, "navigation.currentEntry/entries()/canGoBack/canGoForward after iframe removal");
</script>