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<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
promise_test(async t => {
let start_length = navigation.entries().length;
let start_index = navigation.currentEntry.index;
// 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("#foo").finished;
assert_equals(navigation.entries().length, start_length+1);
await navigation.back().finished;
assert_equals(navigation.currentEntry.index, start_index);
// Traverse forward then immediately do a same-document push. This will
// truncate the back forward list, and by the time the traverse commits, the
// destination key will no longer be present in navigation.entries(). The
// traverse should abort. Because the traverse aborts before the navigate
// event fires, the navigateerror event should not fire.
navigation.onnavigateerror = t.unreached_func("navigateerror should not fire");
let forward_value = navigation.forward();
await navigation.navigate("#clobber").finished;
assert_equals(navigation.currentEntry.index, start_index+1);
await promise_rejects_dom(t, "AbortError", forward_value.committed);
await promise_rejects_dom(t, "AbortError", forward_value.finished);
// This leaves navigation.entries() in a consistent state where traversing
// back and forward still works.
await navigation.back().finished;
assert_equals(navigation.currentEntry.index, start_index);
await navigation.forward().finished;
assert_equals(navigation.currentEntry.index, start_index+1);
}, "If forward pruning clobbers the target of a traverse, abort");
</script>
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