HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>minlength — form 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 1rem;font-size:1.25rem;color:#0f172a}label{display:block;margin:.75rem 0 .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:1rem;padding:.5rem 1rem;font:inherit;cursor:pointer;border-radius:6px;border:1px solid #cbd5e1;background:#2563eb;color:#fff}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}</style>

</head>

<body>

  <h1>minlength on signup fields</h1>

  <form id=signup>

    <label for=username>Username (min 3):</label>

    <input id=username name=username minlength=3 required>



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

    <input type=password id=password name=password minlength=8 required>



    <button type=submit>Sign up</button>

  </form>

  <p class=hint>Submit with short values to see browser validation. Username needs 3+ chars; password needs 8+.</p>



  <script>document.getElementById("signup").addEventListener("submit",(function(e){e.preventDefault(),this.checkValidity()&&alert("Form valid — both fields meet minlength requirements.")}))</script>

</body>

</html>

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HTML minlength Attribute — Signup Form