HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>max — number input</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;margin-bottom:.35rem;font-weight:500;font-size:.875rem}input{width:100%;max-width:280px;padding:.5rem .65rem;font:inherit;border:1px solid #cbd5e1;border-radius:6px}button{margin-top:.75rem;padding:.5rem 1rem;font:inherit;cursor:pointer;border-radius:6px;border:1px solid #cbd5e1;background:#fff}.status{margin-top:.75rem;font-size:.8125rem;color:#64748b;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>
</head>
<body>
  <h1>max on &lt;input type="number"&gt;</h1>
  <label for=qty>Quantity (max 100):</label>
  <input type=number id=qty name=qty min=1 max=100 value=50>
  <button type=button id=checkBtn>Check validity</button>
  <p class=status id=status>Try entering 150 — the browser marks values above <code>max="100"</code> as invalid.</p>

  <script>document.getElementById("checkBtn").addEventListener("click",(function(){var e=document.getElementById("qty"),t=e.checkValidity()?"Valid: "+e.value+" is within 1–100.":"Invalid: value must be between "+e.min+" and "+e.max+".";document.getElementById("status").textContent=t}))</script>
</body>
</html>

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HTML max Attribute — Number Input Upper Limit