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<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="helpers.js"></script>
<!-- Put this page in a sandbox to give it an opaque origin -->
<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));
navigation.onnavigate = t.unreached_func("onnavigate should not be called");
navigation.onnavigatesuccess = t.unreached_func("onnavigatesuccess should not be called");
navigation.onnavigateerror = t.unreached_func("onnavigateerror should not be called");
location.hash = "#1";
await new Promise(resolve => window.onhashchange = resolve);
location.hash = "#2";
await new Promise(resolve => window.onhashchange = resolve);
history.back();
await new Promise(resolve => window.onhashchange = resolve);
assert_equals(location.hash, "#1");
await assertBothRejectDOM(t, navigation.back(), "InvalidStateError");
await assertBothRejectDOM(t, navigation.forward(), "InvalidStateError");
}, "navigation.back()/forward() in an opaque origin iframe");
</script>
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