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chromium/third_party/blink/web_tests/external/wpt/fenced-frame/resources/web-nfc-inner.https.html 

<!DOCTYPE html>
<script src="utils.js"></script>
<title>Fenced frame content to report the value of Web NFC API</title>

<body>
<script>
async function init() {
  const [ndef_write_key, ndef_scan_key] = parseKeylist();

  const ndef = new NDEFReader();
  ndef.write("Hello").then(
    () => { writeValueToServer(ndef_write_key, "resolved"); },
    () => { writeValueToServer(ndef_write_key, "rejected"); }
  );
  ndef.scan().then(
    () => { writeValueToServer(ndef_scan_key, "resolved"); },
    () => { writeValueToServer(ndef_scan_key, "rejected"); }
  );
}

init();
</script>
</body>