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chromium/third_party/blink/web_tests/external/wpt/navigation-api/navigation-history-entry/entries-after-cross-document-forward-pruning.html 

<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/is_uuid.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.location.search = "?2";
  await new Promise(r => i.onload = () => t.step_timeout(r, 0));

  i.contentWindow.location.search = "?3";
  await new Promise(r => i.onload = () => t.step_timeout(r, 0));

  i.contentWindow.history.back();
  await new Promise(r => i.onload = () => t.step_timeout(r, 0));

  i.contentWindow.history.back();
  await new Promise(r => i.onload = () => t.step_timeout(r, 0));

  i.contentWindow.location.search = "?fork";
  await new Promise(r => i.onload = () => t.step_timeout(r, 0));

  const entries = i.contentWindow.navigation.entries();
  const searches = entries.map(e => (new URL(e.url)).search);
  assert_array_equals(searches, ["", "?fork"]);

  assert_equals(i.contentWindow.navigation.entries().at(-1), i.contentWindow.navigation.currentEntry);
}, "navigation.entries() behavior after forward-pruning due to cross-document navs");
</script>