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<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>noresize sidebar frameset</title>
  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 1rem;font-size:1.25rem;color:#0f172a}.frameset-demo{display:flex;gap:4px;max-width:480px;height:160px;border:1px solid #94a3b8;border-radius:6px;overflow:hidden;background:#e2e8f0}.frame-pane{display:flex;align-items:center;justify-content:center;font-size:.8125rem;color:#475569;background:#f8fafc;border:1px solid #cbd5e1;text-align:center;padding:.5rem}.frame-pane--nav{flex:0 0 200px;background:#dbeafe}.frame-pane--main{flex:1 1 auto}pre{margin:1rem 0 0;padding:1rem;background:#1e293b;color:#e2e8f0;border-radius:8px;font-size:.75rem;overflow-x:auto;max-width:480px}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:480px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>
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  <h1>noresize — fixed sidebar</h1>
  <div class=frameset-demo aria-label="Sidebar frameset simulation">
    <div class="frame-pane frame-pane--nav">navigation.html<br><strong>noresize</strong></div>
    <div class="frame-pane frame-pane--main">content.html<br>(resizable)</div>
  </div>

  <pre>&lt;frameset cols="200,*"&gt;
  &lt;frame src="navigation.html" name="nav" noresize&gt;
  &lt;frame src="content.html" name="main"&gt;
&lt;/frameset&gt;</pre>

  <p class=hint>A fixed-width nav column with <code>noresize</code> keeps the sidebar from being dragged narrower or wider.</p>
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HTML noresize on frame — Fixed Sidebar