html: Form Required

login.html

<form>
    <p>
        <label>Login:</label>
        <input type="email" name="login" required placeholder="Ihre Emailadresse" />
    </p>
    <p>
        <label>Passwort:</label>
        <input type="password" name="pw" required placeholder="Ihr hinterlegtes Passwort" />
    </p>
    <p>
        <button>Login</button>
    </p>
</form>