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<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<iframe id="i" src="/common/blank.html"></iframe>
<script type="module">
import { ensureWindowLoadEventFired } from "../resources/helpers.mjs";
promise_test(async t => {
// Wait for after the load event so that the navigation doesn't get converted
// into a replace navigation.
await ensureWindowLoadEventFired(t);
let destination_key = i.contentWindow.navigation.currentEntry.key;
let destination_id = i.contentWindow.navigation.currentEntry.id;
let destination_index = i.contentWindow.navigation.currentEntry.index;
await i.contentWindow.navigation.navigate("#1").finished;
let back_destination;
i.contentWindow.navigation.onnavigate = e => back_destination = e.destination;
await i.contentWindow.navigation.back().finished;
// Before detach, key/id/index are valid.
assert_equals(back_destination.key, destination_key);
assert_equals(back_destination.id, destination_id);
assert_equals(back_destination.index, destination_index);
i.remove();
// After detach, key/id/index are invalid, but the url is still valid.
assert_equals(back_destination.key, "");
assert_equals(back_destination.id, "");
assert_equals(new URL(back_destination.url).pathname, "/common/blank.html");
assert_equals(back_destination.index, -1);
}, "navigate event destination after iframe detach");
</script>
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