File: xmlhttprequest-sync-not-hang-scriptloader-subframe.html

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<!DOCTYPE html>
<script>
  function secondScriptRan() {
    parent.postMessage("done", "*");
  }

  function createSecondScript() {
      var script = document.createElement("script");
      script.src = "data:application/javascript,secondScriptRan()";
      document.head.appendChild(script);

      var xhr = new XMLHttpRequest();
      xhr.open("GET", "data:,", false);
      xhr.send();
  }
</script>
<script src="data:application/javascript,createSecondScript()" defer></script>