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<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/helpers.js"></script>
<iframe id="i" src="/common/blank.html"></iframe>
<script>
promise_test(async t => {
// Wait for after the load event so that the navigation doesn't get converted
// into a replace navigation.
await new Promise(resolve => window.onload = () => t.step_timeout(resolve, 0));
assert_equals(i.contentWindow.navigation.entries().length, 1);
let key = i.contentWindow.navigation.currentEntry.key;
i.contentWindow.navigation.navigate("?1");
await new Promise(resolve => i.onload = resolve);
assert_equals(i.contentWindow.navigation.entries().length, 2);
assert_equals(i.contentWindow.navigation.currentEntry, i.contentWindow.navigation.entries()[1]);
const iWindow = i.contentWindow;
const iDOMException = iWindow.DOMException;
i.remove();
await assertBothRejectDOM(t, iWindow.navigation.back(), "InvalidStateError", iWindow, iDOMException);
}, "back() in a detached window");
</script>
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