navigation-api-navigate-event-browser-initiated-back.html

<!doctype html>
PASS if no errors are reported.
<iframe id="i" src="resources/success.html"></iframe>
<script>
if (window.testRunner) {
  testRunner.dumpAsText();
  testRunner.queueLoadingScript("i.contentWindow.navigation.navigate('about:blank');");
  testRunner.queueBackNavigation(1);
}

function assert_equals(actual, expected) {
  if (!Object.is(actual, expected))
    throw Error(message + ': expected: ' + expected + ', actual: ' + actual);
}
function assert_true(expected) { assert_equals(true, expected); }
function assert_false(expected) { assert_equals(false, expected); }

i.onload = () => {
  let target_key = i.contentWindow.navigation.currentEntry.key;
  let target_id = i.contentWindow.navigation.currentEntry.id;
  i.onload = () => {
    i.contentWindow.navigation.onnavigate = e => {
      assert_equals(e.navigationType, "traverse");
      assert_false(e.cancelable);
      assert_false(e.canTransition);
      assert_true(e.userInitiated);
      assert_false(e.hashChange);
      assert_equals(new URL(e.destination.url).pathname, "/misc/resources/success.html");
      assert_false(e.destination.sameDocument);
      assert_equals(e.destination.key, target_key);
      assert_equals(e.destination.id, target_id);
      assert_equals(e.destination.index, 0);
      assert_equals(e.formData, null);
      assert_equals(e.info, undefined);
    };
  };
};
</script>

chromium/third_party/blink/web_tests/http/tests/misc/navigation-api-navigate-event-browser-initiated-back.html