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<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../navigation-methods/return-value/resources/helpers.js"></script>
<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));
await navigation.navigate("#1").finished;
let back_destination;
navigation.addEventListener("navigate", t.step_func(e => {
back_destination = e.destination;
assert_equals(back_destination.index, 0);
}), { once: true });
await navigation.back().finished;
// Disposing the destination entry of back_destination should update
// back_destination.index, even though back_destination's navigation has
// completed.
await navigation.navigate("#clobber_back", { history: "replace" }).finished;
assert_equals(back_destination.index, -1);
navigation.addEventListener("navigate", t.step_func(e => {
assert_equals(e.destination.index, 1);
// Dispose the destination entry and destination.index should update.
navigation.navigate("#clobber_forward");
assert_equals(e.destination.index, -1);
}), { once: true });
await assertBothRejectDOM(t, navigation.forward(), "AbortError");
}, "navigate event destination.index should be dynamic");
</script>
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