file_restricted_dynamic.html

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<!DOCTYPE html>

<html>

<head>

<title>restricted</title>

</head>

<body>

  <iframe id="frame"></iframe>

  <script>

    let meta = document.createElement("meta");

    meta.name = "rating";

    meta.content = "adult";

    document.head.appendChild(meta);

    var event = new CustomEvent("TestKeepsRunningScripts");

    document.dispatchEvent(event, {bubbles:true});

  </script>

</body>

</html>