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chromium/third_party/blink/web_tests/external/wpt/infrastructure/expected-fail/unhandled-rejection.html 

<!DOCTYPE html>
<meta charset=utf-8>
<title>Unhandled rejection</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
Promise.reject(new Error("error outside any setup or test"));
</script>