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<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<iframe id="i" src="/common/blank.html"></iframe>
<script>
async_test(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.
window.onload = () => t.step_timeout(() => {
assert_equals(navigation.entries().length, start_length);
assert_equals(i.contentWindow.navigation.entries().length, 1);
navigation.navigate("#top");
assert_equals(navigation.entries().length, start_length+1);
assert_equals(i.contentWindow.navigation.entries().length, 1);
let iframe_initial_key = i.contentWindow.navigation.currentEntry.key;
i.contentWindow.navigation.navigate("#1");
i.contentWindow.navigation.navigate("#2");
assert_equals(navigation.entries().length, start_length+1);
assert_equals(i.contentWindow.navigation.entries().length, 3);
assert_equals(navigation.currentEntry.index, start_index+1);
assert_equals(i.contentWindow.navigation.currentEntry.index, 2);
assert_true(navigation.canGoBack);
assert_true(i.contentWindow.navigation.canGoBack);
// There are 2 joint session history entries containing the iframe's
// initial key. Navigate to the nearest one (which navigates the iframe
// but not the top window).
i.contentWindow.navigation.traverseTo(iframe_initial_key).committed.then(t.step_func_done(() => {
assert_equals(navigation.currentEntry.index, start_index+1);
assert_equals(i.contentWindow.navigation.currentEntry.index, 0);
}));
}, 0);
}, "navigation.traverseTo() goes to the nearest entry when going back");
</script>
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