HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>order: sidebar layout</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

    p {
      margin: 0 0 12px;
      max-width: 40rem;
      line-height: 1.5;
    }

    main {
      display: flex;
      gap: 8px;
      text-align: center;
    }

    article {
      order: 2;
      flex: 1;
      padding: 16px;
      background: #dbeafe;
      border: 1px solid #2563eb;
      font-weight: 700;
    }

    nav {
      order: 1;
      width: 100px;
      padding: 16px;
      background: #fef3c7;
      border: 1px solid #d97706;
      font-weight: 700;
    }

    aside {
      order: 3;
      width: 100px;
      padding: 16px;
      background: #dcfce7;
      border: 1px solid #16a34a;
      font-weight: 700;
    }
  </style>
</head>
<body>
  <p>HTML order is article → nav → aside. Visual order is <strong>nav, article, aside</strong>.</p>
  <main>
    <article>Article</article>
    <nav>Nav</nav>
    <aside>Aside</aside>
  </main>
</body>
</html>

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CSS order Property — Sidebar Layout