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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>
promise_test(async t => {
await new Promise(resolve => window.onload = resolve);
await i.contentWindow.navigation.navigate("#start", { history: "replace", state: "someState" });
assert_equals(i.contentWindow.navigation.entries().length, 1);
assert_equals(i.contentWindow.navigation.entries()[0].getState(), "someState");
await i.contentWindow.navigation.navigate("#foo");
assert_equals(i.contentWindow.navigation.entries().length, 2);
assert_equals(i.contentWindow.navigation.entries()[0].getState(), "someState");
i.contentWindow.navigation.navigate("/common/blank.html?bar");
await new Promise(resolve => i.onload = resolve);
assert_equals(i.contentWindow.navigation.entries().length, 3);
assert_equals(i.contentWindow.navigation.entries()[0].getState(), "someState");
i.contentWindow.navigation.back();
await new Promise(resolve => i.onload = resolve);
assert_equals(i.contentWindow.navigation.entries().length, 3);
assert_equals(i.contentWindow.navigation.currentEntry.index, 1);
assert_equals(i.contentWindow.navigation.entries()[0].getState(), "someState");
}, "entry.getState() is properly restored after cross-document back");
</script>
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