HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>CSS Spacing Alternative</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 1rem;font-size:1.25rem;color:#0f172a}.spaced-row{display:flex;gap:1.25rem;align-items:center;max-width:420px;padding:.75rem 1rem;background:#fff;border:1px solid #e2e8f0;border-radius:8px}.box{padding:.5rem .85rem;background:#eff6ff;border:1px solid #bfdbfe;border-radius:6px;font-size:.9375rem;color:#1e40af}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}</style>

</head>

<body>

  <h1>Modern CSS spacing</h1>

  <div class=spaced-row>

    <div class=box>Item A</div>

    <div class=box>Item B</div>

    <div class=box>Item C</div>

  </div>

  <p class=hint>Use <code>gap</code>, <code>margin</code>, or <code>padding</code> instead of the obsolete spacer tag.</p>

</body>

</html>

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HTML spacer Tag — Modern CSS Spacing Alternative