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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);
i.contentWindow.navigation.back();
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()[0]);
let navigateEventCount = 0;
i.contentWindow.navigation.onnavigate = () => navigateEventCount++;
i.contentWindow.navigation.onnavigatesuccess = t.unreached_func("onnavigatesuccess should not be called");
i.contentWindow.navigation.onnavigateerror = t.unreached_func("onnavigateerror should not be called");
let assertionPromise;
// The iframe does not have sticky activation, so per
// https://html.spec.whatwg.org/#prompt-to-unload-a-document, no prompt is
// shown and the navigation will proceed.
i.contentWindow.onbeforeunload = t.step_func(() => {
assertionPromise = assertBothRejectDOM(t, i.contentWindow.navigation.forward(), "InvalidStateError", i.contentWindow);
});
i.contentWindow.navigation.navigate("?1");
assert_not_equals(assertionPromise, undefined);
await assertionPromise;
assert_equals(navigateEventCount, 1);
}, "forward() inside onbeforeunload");
</script>
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