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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>styleSheetSets loop</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    if ("styleSheetSets" in document) {
      var names = [];
      for (var name of document.styleSheetSets) names.push(name);
      document.getElementById("out").textContent = names.join("\n") || "(empty list)";
    } else {
      document.getElementById("out").textContent = "Property not available";
    }
  </script>
</body>
</html>

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styleSheetSets — loop set names (Try It)