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chromium/third_party/blink/web_tests/payments/payment-request-in-iframe-nested-not-allowed.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Test for PaymentRequest in an iframe</title>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<iframe src="resources/payment-request-in-iframe-nested-expect-failure.html"></iframe>