HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>iframe Replacement Example</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 .75rem;font-size:1.25rem;color:#0f172a}.layout{display:grid;grid-template-columns:1fr 1fr;gap:.5rem;max-width:520px}iframe{width:100%;min-height:140px;border:1px solid #cbd5e1;border-radius:6px;background:#fff}.note{margin-top:1rem;font-size:.875rem;color:#64748b;max-width:520px}</style>
</head>
<body>
  <h1>Modern Split Layout with iframe</h1>
  <div class=layout>
    <iframe src=about:blank title="Sidebar panel"></iframe>
    <iframe src=about:blank title="Main content panel"></iframe>
  </div>
  <p class=note>This HTML5 pattern replaces obsolete frame/frameset layouts.</p>
</body>
</html>

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HTML frame Tag — Modern iframe Replacement