HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="UTF-8">

  <meta name="viewport" content="width=device-width, initial-scale=1.0">

  <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 0.75rem;

      font-size: 1.25rem;

      color: #0f172a;

    }

    .layout {

      display: grid;

      grid-template-columns: 25% 50% 25%;

      gap: 0.5rem;

      max-width: 560px;

    }

    iframe {

      width: 100%;

      min-height: 120px;

      border: 1px solid #cbd5e1;

      border-radius: 6px;

      background: #fff;

    }

    .note {

      margin-top: 1rem;

      font-size: 0.875rem;

      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 — noframes Fallback