HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>resize: vertical</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

    p {
      margin: 0 0 12px;
      max-width: 40rem;
      line-height: 1.5;
    }

    textarea {
      width: 220px;
      height: 80px;
      resize: vertical;
    }
  </style>
</head>
<body>
  <p><strong>resize: vertical</strong> — height changes; width stays fixed.</p>
  <textarea>Resize me up and down only.</textarea>
</body>
</html>

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CSS resize Property — vertical