testing/web-platform/tests/html/browsers/windows/support-nested-browsing-contexts.html


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<body>
<script>
  var i = document.createElement("iframe");
  i.name = "nested1";
  document.body.appendChild(i);

  window.opener.postMessage({
    "name": window.name,
    "isTop": window.top === window
  }, "*");
</script>
</body>