HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>Form default values</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 .75rem;font-size:1.25rem;color:#0f172a}form{max-width:420px;padding:1rem;background:#fff;border:1px solid #e2e8f0;border-radius:8px}label{display:block;margin:.75rem 0 .25rem;font-size:.875rem;font-weight:600;color:#475569}input,select{width:100%;box-sizing:border-box;font:inherit;padding:.45rem .6rem;border:1px solid #cbd5e1;border-radius:6px}.note{margin-top:1rem;font-size:.875rem;color:#9a3412;background:#fff7ed;border:1px solid #fdba74;padding:.65rem .75rem;border-radius:6px;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

</head>

<body>

  <h1>Correct form default attributes</h1>

  <form action=# onsubmit=return!1>

    <label for=username>Username</label>

    <input id=username name=username value=JohnDoe>



    <label for=subscribe>

      <input type=checkbox id=subscribe name=subscribe checked>

      Subscribe to newsletter

    </label>



    <label for=country>Country</label>

    <select id=country name=country>

      <option value=US selected>United States</option>

      <option value=CA>Canada</option>

    </select>

  </form>

  <p class=note><strong>Not valid:</strong> <code>default="JohnDoe"</code> on inputs. Use <code>value</code>, <code>checked</code>, and <code>selected</code> instead. The HTML <code>default</code> attribute is for <code>&lt;track&gt;</code> only.</p>

</body>

</html>

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Form Defaults — Not the default Attribute