HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>div.card combined selector</title>

  <style>

    body { font-family: sans-serif; padding: 16px; }

    .card { padding: 12px; margin: 8px 0; border: 1px solid #ccc; }

    .highlight { background: #fef3c7; border-color: #f59e0b; }

  </style>

</head>

<body>

  <div class="card">div.card — matches</div>

  <span class="card">span.card — no match</span>

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    $("div.card").addClass("highlight");

  </script>

</body>

</html>

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div.card element + class (Try It)