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Test Info: Warnings

<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
async_test(t => {
// Wait for after the load event so that the navigation doesn't get converted
// into a replace navigation.
window.onload = () => t.step_timeout(t.step_func_done(() => {
let navState = { statevar: "state" };
navigation.navigate("#foo", { history: "replace", state: navState });
let target_key = navigation.currentEntry.key;
let target_id = navigation.currentEntry.id;
navigation.navigate("#bar");
navigation.onnavigate = t.step_func_done(e => {
assert_equals(e.navigationType, "traverse");
assert_not_equals(e.destination, null);
assert_not_equals(e.destination.getState(), undefined);
assert_not_equals(e.destination.getState(), e.destination.getState());
assert_equals(e.destination.key, "");
assert_equals(e.destination.id, "");
assert_equals(e.destination.index, -1);
// NavigateEvent sourceElement is still in development, so test whether it is available.
if ("sourceElement" in e) assert_equals(e.sourceElement, null);
});
navigation.back();
}), 0);
}, "navigate event destination.getState() on back/forward navigation");
</script>