HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>maxlength — text 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:320px;padding:.5rem .65rem;font:inherit;border:1px solid #cbd5e1;border-radius:6px}.counter{margin-top:.5rem;font-size:.8125rem;color:#64748b}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>
</head>
<body>
  <h1>maxlength on &lt;input type="text"&gt;</h1>
  <label for=bio>Short bio (max 50 characters):</label>
  <input id=bio maxlength=50 placeholder="Type here…">
  <p class=counter id=counter>0 / 50 characters</p>

  <script>var bio=document.getElementById("bio"),counter=document.getElementById("counter");bio.addEventListener("input",(function(){counter.textContent=bio.value.length+" / 50 characters"}))</script>
</body>
</html>

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HTML maxlength Attribute — Text Input Character Limit