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<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<iframe id="iframe" 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(r => window.onload = () => t.step_timeout(r, 0));
await iframe.contentWindow.navigation.navigate("#a");
await navigation.navigate("#1").finished;
await navigation.navigate("#2").finished;
await navigation.navigate("#3").finished;
await iframe.contentWindow.navigation.back().finished;
assert_equals(navigation.entries().length, 4);
assert_equals(iframe.contentWindow.navigation.entries().length, 2);
assert_equals(navigation.currentEntry.index, 0);
assert_equals(iframe.contentWindow.navigation.currentEntry.index, 0);
let top_entry_0_before = navigation.entries()[0];
let dispose_promises = [];
for (let i = 1; i < navigation.entries().length; i++) {
dispose_promises.push(new Promise(r => navigation.entries()[i].ondispose = r))
}
// This push navigation should truncate in the top window.
await iframe.contentWindow.navigation.navigate("#b").finished;
// entries() should be updated in both frames, and all forward entries in the
// top window should have dispose events, even though that wasn't the window
// that navigated.
await Promise.all(dispose_promises);
assert_equals(navigation.entries().length, 1);
assert_equals(iframe.contentWindow.navigation.entries().length, 2);
assert_equals(navigation.currentEntry.index, 0);
assert_equals(iframe.contentWindow.navigation.currentEntry.index, 1);
assert_equals(navigation.entries()[0], top_entry_0_before);
}, "Dispose events should fire when entries are removed by a navigation in a different frame");
</script>
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