HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>required — single field</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}form{max-width:360px}label{display:block;margin-bottom:.35rem;font-weight:500;font-size:.875rem}input{width:100%;padding:.5rem .65rem;font:inherit;border:1px solid #cbd5e1;border-radius:6px;box-sizing:border-box;margin-bottom:.75rem}button{padding:.5rem 1.25rem;font:inherit;cursor:pointer;border-radius:6px;border:none;background:#2563eb;color:#fff}.hint{font-size:.8125rem;color:#64748b;margin-top:.75rem}</style>

</head>

<body>

  <h1>required attribute</h1>



  <form>

    <label for=username>Username:</label>

    <input id=username name=username required>

    <button type=submit>Submit</button>

  </form>



  <p class=hint>Leave username empty and click Submit — the browser blocks it.</p>

</body>

</html>

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HTML required Attribute — single field