HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>CSS Grid 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:25% 50% 25%;gap:.5rem;max-width:560px}iframe{width:100%;min-height:120px;border:1px solid #cbd5e1;border-radius:6px;background:#fff}.note{margin-top:1rem;font-size:.875rem;color:#64748b;max-width:560px}</style>

</head>

<body>

  <h1>Modern Three-Column Layout</h1>

  <div class=layout>

    <iframe src=about:blank title="Left sidebar"></iframe>

    <iframe src=about:blank title="Main content"></iframe>

    <iframe src=about:blank title="Right sidebar"></iframe>

  </div>

  <p class=note>This HTML5 pattern replaces obsolete frameset/frameset column layouts.</p>

</body>

</html>

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HTML frameset Tag — Modern CSS Grid Replacement