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<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>max — dynamic range</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:.75rem 0 .35rem;font-size:.875rem;font-weight:500}input[type=range]{width:100%;max-width:320px}button{margin-top:.75rem;padding:.5rem 1rem;font:inherit;cursor:pointer;border-radius:6px;border:1px solid #cbd5e1;background:#2563eb;color:#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>input.max in JavaScript</h1>
  <label for=price>Ticket price: <span id=val>250</span></label>
  <input type=range id=price min=0 max=500 value=250>
  <button type=button id=raiseMax>Raise max to 1000</button>
  <p class=status id=status>Current max: 500. Click the button to set <code>price.max = "1000"</code>.</p>

  <script>var price=document.getElementById("price"),val=document.getElementById("val"),status=document.getElementById("status");price.addEventListener("input",(function(){val.textContent=price.value})),document.getElementById("raiseMax").addEventListener("click",(function(){price.max="1000",status.textContent="max updated to 1000 via input.max property."}))</script>
</body>
</html>

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HTML max Attribute — Dynamic max with JavaScript