HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>minlength — password</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}button{margin-top:.75rem;padding:.5rem 1rem;font:inherit;cursor:pointer;border-radius:6px;border:1px solid #cbd5e1;background:#fff}.counter{margin-top:.5rem;font-size:.8125rem;color:#64748b}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

</head>

<body>

  <h1>minlength on &lt;input type="password"&gt;</h1>

  <label for=password>Password (min 8 characters):</label>

  <input type=password id=password minlength=8 placeholder="At least 8 chars">

  <button type=button id=checkBtn>Check validity</button>

  <p class=counter id=status>Type a short password and click Check — fewer than 8 chars fails validation.</p>



  <script>var pwd=document.getElementById("password");document.getElementById("checkBtn").addEventListener("click",(function(){var t=pwd.checkValidity()?"Valid: password has at least "+pwd.minLength+" characters.":"Invalid: password must be at least "+pwd.minLength+" characters.";document.getElementById("status").textContent=t})),pwd.addEventListener("input",(function(){document.getElementById("status").textContent=pwd.value.length+" characters entered (minimum "+pwd.minLength+")."}))</script>

</body>

</html>

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HTML minlength Attribute — Password Minimum Length