HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS select/textarea:optional</title>
  <style>
    select:optional,
    textarea:optional {
      border: 2px dashed #64748b;
    }
  </style>
</head>
<body>
  <form>
    <p>
      <select aria-label="Optional topic">
        <option>Optional topic</option>
      </select>
    </p>
    <p>
      <textarea aria-label="Optional notes">Optional notes</textarea>
    </p>
  </form>
</body>
</html>

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CSS :optional - select and textarea