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Test Info: Warnings

<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<iframe id="i" src="resources/key-navigate-back-cross-document-helper.html"></iframe>
async_test(t => {
let start_length = navigation.entries().length;
window.finish = t.step_func_done((end_key, end_id) => {
assert_equals(window.start_key, end_key);
assert_equals(window.start_id, end_id);
// The new history entry in the iframe should not add any entries to
// this window's navigation.
assert_equals(navigation.entries().length, start_length);
}, "NavigationHistoryEntry's key and id on cross-document back navigation");