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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>
<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));
// Navigate the iframe, then the top window, so that when the iframe goes back
// to its initial entry, the top window navigates as well.
await i.contentWindow.navigation.navigate("#").finished;
await navigation.navigate("#").finished;
assert_equals(navigation.entries().length, 2);
assert_equals(i.contentWindow.navigation.entries().length, 2);
assert_equals(navigation.currentEntry.index, 1);
assert_equals(i.contentWindow.navigation.currentEntry.index, 1);
// Ensure the top window, which is allowed to cancel the traversal, does so.
navigation.onnavigate = e => e.preventDefault();
let top_navigateerror_fired = false;
navigation.onnavigateerror = t.step_func(e => {
assert_equals(e.constructor, ErrorEvent);
assert_equals(e.filename, location.href);
top_navigateerror_fired = true;
});
i.contentWindow.navigation.onnavigate = t.unreached_func("navigate event should not fire in the iframe, because the traversal was cancelled in the top window");
i.contentWindow.navigation.onnavigateerror = t.unreached_func("navigateerror event should not fire in the iframe, because the navigate event was not fired");
// When the top window blocks the traversal, it should be blocked in the
// iframe as well, and the traversal promises in the iframe should be rejected.
const iWindow = i.contentWindow;
const iDOMException = iWindow.DOMException;
await assertBothRejectDOM(t, i.contentWindow.navigation.traverseTo(i.contentWindow.navigation.entries()[0].key), "AbortError", iWindow, iDOMException);
assert_true(top_navigateerror_fired);
assert_equals(navigation.currentEntry.index, 1);
assert_equals(i.contentWindow.navigation.currentEntry.index, 1);
}, "navigation.traverseTo() in an iframe with same-document preventDefault in its parent");
</script>
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