<!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>
async_test(t => {
  window.onload = t.step_func(() => {
    i.onload = t.step_func_done(() => {
      let entries = i.contentWindow.navigation.entries();
      assert_equals(entries.length, 2);
      assert_not_equals(entries[1].key, entries[0].key);
      assert_not_equals(entries[1].