HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery prefer specific selector</title>
  <style>
    #test { padding: 12px; border: 1px solid #cbd5e1; margin-top: 8px; }
    div, span, p {
      display: inline-block;
      padding: 8px 12px;
      margin: 6px;
      background: #f1f5f9;
    }
  </style>
</head>
<body>
  <p>Click the button — only it gets the green outline (not every element).</p>
  <div id="test">
    <div>DIV</div>
    <span>SPAN</span>
    <p>P</p>
    <button type="button">Button</button>
  </div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#test button").css("outline", "2px dashed green");
  </script>
</body>
</html>

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jQuery specific selector vs universal (Try It)