HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>frameset vs iframe</title>
  <style>
    body { font-family: system-ui, sans-serif; padding: 1.5rem; line-height: 1.6; }
    .dep-tag-legacy { border: 1px dashed #f59e0b; padding: 0.75rem; margin: 0.5rem 0; background: #fffbeb; }
    iframe { width: 100%; height: 120px; border: 1px solid #cbd5e1; border-radius: 4px; }
  </style>
</head>
<body>
  <h1>frameset vs iframe</h1>

  <h2>Legacy (obsolete)</h2>
  <div class="dep-tag-legacy">
    <p><strong>&lt;frameset&gt;</strong> split the entire viewport into multiple documents. It is removed from HTML5.</p>
    <pre>&lt;frameset cols="50%,50%"&gt;
  &lt;frame src="nav.html"&gt;
  &lt;frame src="main.html"&gt;
&lt;/frameset&gt;</pre>
  </div>

  <h2>Modern replacement</h2>
  <p>Embed one page at a time with <code>&lt;iframe&gt;</code>:</p>
  <iframe srcdoc="&lt;p style='font-family:system-ui;padding:1rem;margin:0'&gt;Embedded content via iframe&lt;/p&gt;" title="Embedded demo page"></iframe>
</body>
</html>

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HTML Deprecated Tags — frameset vs iframe