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<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <title>Frameset Layout Example</title>
  <style>body{font-family:system-ui,sans-serif;margin:1.5rem;color:#334155;line-height:1.7}h1{font-size:1.25rem;color:#0f172a;margin:0 0 .75rem}.note{margin-top:1rem;background:#fffbeb;border:1px solid #fde68a;border-radius:8px;padding:.75rem 1rem;font-size:.875rem;color:#92400e;max-width:520px}pre{background:#0f172a;color:#e2e8f0;padding:1rem;border-radius:8px;overflow-x:auto;font-size:.8125rem}</style>
</head>
<body>
  <h1>Frameset Layout (Historical)</h1>
  <pre>&lt;frameset cols="50%,50%"&gt;
  &lt;frame src="sidebar.html" name="leftFrame"&gt;
  &lt;frame src="content.html" name="rightFrame"&gt;
  &lt;noframes&gt;
    &lt;p&gt;Your browser does not support frames.&lt;/p&gt;
  &lt;/noframes&gt;
&lt;/frameset&gt;</pre>
  <p class=note>Framesets are removed from HTML5. Use CSS grid/flexbox with iframe for modern split layouts.</p>
</body>
</html>

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HTML frame Tag — Frameset Layout