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chromium/third_party/blink/web_tests/external/wpt/navigation-api/navigation-methods/return-value/back.html 

<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/helpers.js"></script>

<script>
promise_test(async t => {
  let start_length = navigation.entries().length;
  let start_index = navigation.currentEntry.index;
  // 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));

  location.href = "#1";

  assert_equals(navigation.entries().length, start_length + 1);
  const [entry0, entry1] = navigation.entries().slice(start_index);
  assert_equals((new URL(entry0.url)).hash, "");
  assert_equals((new URL(entry1.url)).hash, "#1");

  const result = navigation.back();
  await assertBothFulfill(t, result, entry0);
  assert_equals(navigation.currentEntry, entry0);
}, "back() promises");
</script>