chromium/third_party/blink/web_tests/external/wpt/fetch/connection-pool/resources/network-partition-checker.html

<!doctype html>
<html>
<head>
  <meta charset="utf-8">
  <title>Network Partition Checker</title>
  <meta name="help" href="https://fetch.spec.whatwg.org/#network-partition-keys">
  <meta name="timeout" content="normal">
  <script src="SUBRESOURCE_PREFIX:&dispatch=fetch_file&path=common/utils.js"></script>
  <script src="SUBRESOURCE_PREFIX:&dispatch=fetch_file&path=resources/testharness.js"></script>
  <script src="SUBRESOURCE_PREFIX:&dispatch=fetch_file&path=fetch/connection-pool/resources/network-partition-key.js"></script>
</head>
<body>
<script>
  async function fetch_and_reply() {
    // If this is a top level window, report to the opener. Otherwise, this is an iframe,
    // so report to the parent.
    var report_to = window.opener;
    if (!report_to)
      report_to = window.parent;
    try {
       await check_partition_ids();
       report_to.postMessage({result: 'success'}, '*');
    } catch (e) {
     report_to.postMessage({result: 'error', details: e.message}, '*');
    }
  }
  fetch_and_reply();
</script>
</body>
</html>