HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>querySelectorAll scope</title>
  <style>div { margin: 4px; padding: 6px; border: 2px solid #0d9488; }</style>
</head>
<body>
  <div id="outer">#outer
    <div id="subject">#subject
      <div id="inner">#inner</div>
    </div>
  </div>
  <pre id="out"></pre>
  <script>
    var subject = document.getElementById("subject");
    var withoutScope = subject.querySelectorAll("#outer #inner");
    var withScope = subject.querySelectorAll(":scope #outer #inner");
    document.getElementById("out").textContent =
      "without :scope: " + withoutScope.length + "\n" +
      "with :scope: " + withScope.length;
  </script>
</body>
</html>

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Element.querySelectorAll — :scope demo (Try It)