HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>resize: vertical</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 24px;
      background: #f8fafc;
    }

    .rsz-compare {
      display: grid;
      gap: 20px;
      max-width: 360px;
    }

    label {
      display: block;
      font-weight: 600;
      margin-bottom: 8px;
      color: #0f172a;
    }

    textarea {
      width: 100%;
      height: 96px;
      padding: 12px;
      border: 2px solid #e2e8f0;
      border-radius: 8px;
      font: inherit;
    }

    .rsz-vertical {
      resize: vertical;
    }

    .rsz-none {
      resize: none;
    }
  </style>
</head>
<body>
  <h1>resize: vertical</h1>
  <div class="rsz-compare">
    <div>
      <label for="grow">Vertical resize enabled</label>
      <textarea id="grow" class="rsz-vertical" placeholder="Drag the bottom edge"></textarea>
    </div>
    <div>
      <label for="fixed">resize: none</label>
      <textarea id="fixed" class="rsz-none" placeholder="Cannot be resized"></textarea>
    </div>
  </div>
</body>
</html>

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Vertical-only resize on a textarea