client-hints-inner.sub.https.html | Explore in Territory

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="utils.js"></script>
<title>Client Hints Helper</title>
<body>
<script type="module">
const [key] = parseKeylist();
let iframe = document.createElement('iframe');
let p = new Promise((resolve, reject) => {
  window.addEventListener('message', e => {
    resolve(e.data);
  });
});
iframe.src = 'client-hints-iframe-inner.sub.https.html';
document.body.appendChild(iframe);
const response = await p;
const result = {
  'root-fenced-frame-headers': {
    'sec-ch-viewport-width': '{{header_or_default(sec-ch-viewport-width, )}}',
    'sec-ch-ua-reduced': '{{header_or_default(sec-ch-ua-reduced, )}}',
    'sec-ch-ua-mobile': '{{header_or_default(sec-ch-ua-mobile, )}}',
  },
  'iframe-headers': response.headers,
};
writeValueToServer(key, JSON.stringify(result));
</script>
</body>

chromium/third_party/blink/web_tests/external/wpt/fenced-frame/resources/client-hints-inner.sub.https.html