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Test Info:

<!doctype html>
<html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<iframe sandbox="allow-scripts" src="../resources/sandboxed-iframe.html"></iframe>
<script>
promise_test(async (t) => {
const message = await new Promise((resolve) => {
window.addEventListener('message', e => resolve(e.data));
});
assert_equals(message, 'PASS');
}, 'CORS with sandboxed iframe');
</script>
</html>