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<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../navigation-methods/return-value/resources/helpers.js"></script>
<script src="/common/get-host-info.sub.js"></script>
<script>
promise_test(async t => {
// Wait for after the load event so that the navigation doesn't get converted
// into a replace navigation.
let w = window.open("resources/opener-postMessage-onload.html");
await new Promise(resolve => window.onmessage = resolve);
// Navigate to a url that will notify us when the navigation is complete.
w.navigation.navigate("opener-postMessage-onload.html?1");
await new Promise(resolve => window.onmessage = resolve);
assert_equals(w.navigation.entries().length, 2);
assert_equals(w.navigation.currentEntry.index, 1);
let navigate_called = false;
w.navigation.onnavigate = t.step_func(e => {
navigate_called = true;
assert_false(e.destination.sameDocument);
assert_false(e.cancelable);
// Should do nothing.
e.preventDefault();
});
w.navigation.back();
await new Promise(resolve => window.onmessage = resolve);
assert_equals(w.navigation.currentEntry.index, 0);
assert_true(navigate_called);
}, "navigation.back() cross-document cannot be cancelled with the navigate event");
</script>
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