HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>comma vs space</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 32rem; }
    .box { border: 1px solid #e2e8f0; padding: 10px; margin: 10px 0; border-radius: 6px; }
    span { display: inline-block; margin: 4px; padding: 4px 8px; background: #f1f5f9; }
    #output { margin-top: 12px; padding: 12px; background: #fef3c7; font-family: monospace; white-space: pre-wrap; }
  </style>
</head>
<body>
  <div class="box"><span>inside div</span></div>
  <span>outside span</span>
  <div id="output"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#output").text(
      "div, span → " + $("div, span").length + " (both div and both spans)\ndiv span → " + $("div span").length + " (span inside div only)"
    );
  </script>
</body>
</html>

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Comma OR vs descendant space (Try It)