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: horizontal</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 24px;
      background: #f8fafc;
    }

    .rsz-panel {
      resize: horizontal;
      overflow: auto;
      width: 240px;
      min-width: 180px;
      max-width: 100%;
      height: 120px;
      padding: 16px;
      background: #eff6ff;
      border: 2px solid #93c5fd;
      border-radius: 10px;
      color: #1e3a8a;
      line-height: 1.6;
    }
  </style>
</head>
<body>
  <h1>resize: horizontal</h1>
  <p>Drag the right edge to change width. Height stays fixed.</p>
  <div class="rsz-panel">
  This panel can grow wider but not taller. Useful when you want users to reveal more text on one line without changing layout height.
  </div>
</body>
</html>

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Horizontal-only resize on a note panel