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<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/helpers.js"></script>
<body>
<script>
promise_test(async t => {
let i = document.createElement("iframe");
document.body.append(i);
i.contentWindow.navigation.onnavigate = t.unreached_func("onnavigate should not be called");
i.contentWindow.navigation.onnavigatesuccess = t.unreached_func("onnavigatesuccess should not be called");
i.contentWindow.navigation.onnavigateerror = t.unreached_func("onnavigateerror should not be called");
// Since there's no way to do a non-replacement navigation on the initial
// about:blank, there's no way to actually get in a situation where we're on
// about:blank but there's something else backward/forward in the history
// list. So this test will almost certainly pass just because there's nothing
// to go back/forward to. Oh well; it's still reasonable coverage.
await assertBothRejectDOM(t, i.contentWindow.navigation.back(), "InvalidStateError", i.contentWindow);
await assertBothRejectDOM(t, i.contentWindow.navigation.forward(), "InvalidStateError", i.contentWindow);
}, "back() and forward() in initial about:blank document");
</script>
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