chromium/third_party/blink/web_tests/wpt_internal/service-worker/resources/partitioned-service-worker-third-party-window-with-token.html

<!DOCTYPE html>
<title>Service Worker: 3P window for partitioned service workers</title>
<script src="./test-helpers.sub.js"></script>
<script src="/common/get-host-info.sub.js"></script>
<head>
<!-- The token below was generated via the following command:
tools/origin_trials/generate_token.py https://not-web-platform.test:8444
DisableThirdPartyStoragePartitioning2 --expire-timestamp=2000000000 -->
<meta http-equiv="origin-trial" content="A3DPTytI20KQsg/ekVlGii9dPqgdhuRNFGt/gxEKvrOBVFPSNkKy9xwF2zEkRXxBoG+Go5xqgfUxuDr1DQvAzgMAAAB6eyJvcmlnaW4iOiAiaHR0cHM6Ly9ub3Qtd2ViLXBsYXRmb3JtLnRlc3Q6ODQ0NCIsICJmZWF0dXJlIjogIkRpc2FibGVUaGlyZFBhcnR5U3RvcmFnZVBhcnRpdGlvbmluZzIiLCAiZXhwaXJ5IjogMjAwMDAwMDAwMH0=">
</head>
<body>
This page should be opened as a third-party window. It then loads an iframe
specified by the query parameter. Finally it forwards the postMessage from the
iframe up to the opener (the test).

<script>

async function onLoad() {
  const message_promise = new Promise(resolve => {
    self.addEventListener('message', evt => {
      resolve(evt.data);
    });
  });

  const search_param = new URLSearchParams(window.location.search);
  const iframe_url = search_param.get('target');

  var frame = document.createElement('iframe');
  frame.src = iframe_url;
  frame.style.position = 'absolute';
  document.body.appendChild(frame);


  await message_promise.then(data => {
    // We're done, forward the message and clean up.
    window.opener.postMessage(data, '*');

    frame.remove();
  });
}

self.addEventListener('load', onLoad);

</script>
</body>