traverseTo-detach.html

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This WPT test may be referenced by the following Test IDs:
- /navigation-api/navigate-event/traverseTo-detach.html - WPT Dashboard Interop Dashboard

<!doctype html>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<iframe id="i" src="/common/blank.html"></iframe>

<script>

promise_test(async () => {

  let event = null;

  await new Promise(r => window.onload = r);

  const key = i.contentWindow.navigation.currentEntry.key;

  i.contentWindow.history.pushState({}, null, "#1");

  let { resolve, promise } = Promise.withResolvers();

  i.contentWindow.navigation.onnavigate = e => {

    event = e;

    e.intercept();

    i.remove();

    resolve();

};

  i.contentWindow.navigation.traverseTo(key);

  await promise;

  assert_true(event.defaultPrevented);

}, "event is canceled when an iframe is detached");

</script>