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<!DOCTYPE html>

<html lang=en>

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  <meta charset=UTF-8>

  <title>Nested frameset 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}pre{background:#0f172a;color:#e2e8f0;padding:1rem;border-radius:8px;overflow-x:auto;font-size:.8125rem}.note{margin-top:1rem;background:#fffbeb;border:1px solid #fde68a;border-radius:8px;padding:.75rem 1rem;font-size:.875rem;color:#92400e;max-width:560px}</style>

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<body>

  <h1>Nested frameset (Historical)</h1>

  <pre>&lt;frameset rows="50%,50%"&gt;

  &lt;frame src="topsection.html"&gt;

  &lt;frameset cols="25%,75%"&gt;

    &lt;frame src="leftcolumn.html"&gt;

    &lt;frame src="maincontent.html"&gt;

  &lt;/frameset&gt;

&lt;/frameset&gt;</pre>

  <p class=note>Nested framesets are obsolete. Replace with CSS grid areas and iframe or semantic HTML in one document.</p>

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HTML frameset Tag — Nested Framesets (Historical)