HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>data vs data-* Attributes</title>
  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1,h2{margin:0 0 .75rem;color:#0f172a}h1{font-size:1.25rem}h2{font-size:1rem;margin-top:1rem}data{font-weight:600;color:#1d4ed8}.product{background:#fff;border:1px solid #e2e8f0;border-radius:8px;padding:.75rem 1rem;max-width:320px}.tip{margin-top:.75rem;background:#eff6ff;border:1px solid #bfdbfe;border-radius:8px;padding:.75rem 1rem;font-size:.875rem;color:#1e40af;max-width:420px}code{font-family:Consolas,monospace;background:#f1f5f9;padding:.1rem .35rem;border-radius:4px;font-size:.9em}</style>
</head>
<body>
  <h1>data Element</h1>
  <p>Product rating: <data value=4.5>4.5 stars</data></p>

  <h2>data-* Attribute (different)</h2>
  <div class=product data-sku=BK-1024 data-price=19.99>
    Notebook &mdash; $19.99
  </div>

  <p class=tip>
    <code>&lt;data value&gt;</code> is an element for machine-readable pairs.
    <code>data-*</code> attributes store custom data on any element.
  </p>
</body>
</html>

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