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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>form Attribute 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}form{max-width:420px;padding:1.25rem;background:#fff;border:1px solid #e2e8f0;border-radius:8px}label{display:block;margin:.65rem 0 .25rem;font-size:.875rem;font-weight:500;color:#475569}label:first-of-type{margin-top:0}button,input[type=password],input[type=submit],input[type=text]{font:inherit}input[type=password],input[type=text]{width:100%;box-sizing:border-box;padding:.45rem .6rem;border:1px solid #cbd5e1;border-radius:6px}button[type=submit],input[type=submit]{margin-top:.75rem;padding:.45rem .85rem;border:1px solid #cbd5e1;border-radius:6px;background:#2563eb;color:#fff;cursor:pointer}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>
</head>
<body>
  <h1>form — login with external button</h1>
  <form id=loginForm action=/submit-login method=post onsubmit=return!1>
    <label for=username>Username:</label>
    <input id=username name=username>

    <label for=password>Password:</label>
    <input type=password id=password name=password>

    <input type=submit value=Login>
  </form>

  <button form=loginForm type=submit>Submit with Button</button>

  <p class=hint>The button outside the form submits <code>loginForm</code> because <code>form="loginForm"</code> matches the form&rsquo;s <code>id</code>.</p>
</body>
</html>

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HTML form Attribute — Login with External Button