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<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<!-- Put this page in a sandbox to give it an opaque origin -->
<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));
location.hash = "#1";
await new Promise(resolve => window.onhashchange = resolve);
location.hash = "#2";
await new Promise(resolve => window.onhashchange = resolve);
history.back();
await new Promise(resolve => window.onhashchange = resolve);
assert_equals(location.hash, "#1");
assert_equals(navigation.currentEntry, null);
assert_equals(navigation.entries().length, 0);
assert_false(navigation.canGoBack);
assert_false(navigation.canGoForward);
}, "navigation.currentEntry/entries()/canGoBack/canGoForward in an opaque origin iframe");
</script>
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