HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>data-* Basic 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 1rem;font-size:1.25rem;color:#0f172a}.card{max-width:420px;padding:1rem 1.1rem;background:#fff;border:1px solid #e2e8f0;border-radius:8px}p{margin:.75rem 0 0;font-size:.875rem;color:#64748b}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

</head>

<body>

  <h1>Custom data on an element</h1>

  <div class=card data-example=custom-data data-role=demo>

    This element has custom data attributes that do not affect how it looks.

  </div>

  <p>The attribute <code>data-example="custom-data"</code> stores extra information for JavaScript or CSS.</p>

</body>

</html>

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HTML data-* Attribute — Basic Example