HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>step — number 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 .75rem;font-size:1.25rem;color:#0f172a}label{display:block;font-weight:600;margin-bottom:.35rem}input[type=number]{padding:.45rem .55rem;border:1px solid #cbd5e1;border-radius:6px;font-size:1rem}.hint{font-size:.8125rem;color:#64748b;margin-top:.75rem}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

</head>

<body>

  <h1>Number input with step</h1>



  <label for=quantity>Quantity:</label>

  <input type=number id=quantity name=quantity min=1 max=10 step=2 value=1>



  <p class=hint>Spinner values: 1, 3, 5, 7, 9. With <code>min="1"</code> and <code>step="2"</code>, even numbers like 2 or 4 are invalid.</p>

</body>

</html>

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HTML step Attribute — number input