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 page-break-before Left Right Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      line-height: 1.6;
      max-width: 36rem;
    }

    @media print {
      .chapter-opener {
        page-break-before: right;
      }

      .appendix-start {
        page-break-before: left;
      }
    }

    .chapter-opener,
    .appendix-start {
      padding: 1rem;
      margin: 1rem 0;
      border-radius: 0.5rem;
      font-size: 0.875rem;
    }

    .chapter-opener {
      background: #f5f3ff;
      border: 1px solid #c4b5fd;
      color: #5b21b6;
    }

    .appendix-start {
      background: #ecfdf5;
      border: 1px solid #6ee7b7;
      color: #047857;
    }
  </style>
</head>
<body>
  <h1>Book layout demo</h1>
  <p>Use print preview to test facing-page rules.</p>

  <div class="chapter-opener">
    <strong>Chapter opener</strong> — page-break-before: right
  </div>

  <div class="appendix-start">
    <strong>Appendix start</strong> — page-break-before: left
  </div>
</body>
</html>

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CSS page-break-before Property - Left and Right Pages