HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>styleSheets list</title>
  <style>body { margin: 1rem; }</style>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var lines = [];
    for (var i = 0; i < document.styleSheets.length; i++) {
      var sheet = document.styleSheets[i];
      lines.push(sheet.href || "inline");
    }
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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styleSheets — list href or inline (Try It)