chromium/third_party/blink/web_tests/external/wpt/secure-contexts/support/shared-worker-insecure-popup.html

<!DOCTYPE html>
<script src="../server-locations.sub.js"></script>
<body>
  <script>
    var url = self[location.search.substr(1)] + "support/https-subframe-shared.html";
    onmessage = function(e) {
      var data = e.data;
      data.fromPopup = true;
      opener.postMessage(data, "*");
    }
    var ifr = document.createElement("iframe");
    ifr.src = url;
    document.body.appendChild(ifr);
  </script>
</body>