HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>image vs attribute</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }
    #output { margin-top: 12px; padding: 12px; background: #fef3c7; font-family: monospace; white-space: pre-wrap; }
  </style>
</head>
<body>
  <form>
    <input type="image" src="https://via.placeholder.com/60x24?text=OK" alt="OK">
  </form>
  <div id="output"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#output").text(
      ":image → " + $("input:image").length + "\n[type=image] → " + $("input[type='image']").length
    );
    $("form").on("submit", function (e) { e.preventDefault(); });
  </script>
</body>
</html>

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:image vs [type=image] (Try It)