testing/web-platform/tests/fetch/private-network-access/resources/opener.html


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<!DOCTYPE html>
<meta charset="utf-8">
<title>Opener</title>
<body></body>
<script>
  window.onmessage = (event) => {
    window.onmessage = (event) => parent.postMessage(event.data, "*");
    const { url } = event.data;
    window.open(url);
  };
</script>