3-Digit Password Validator: Simple JavaScript Example

<!DOCTYPE html>
<html>
<head>
	<title>3-Digit Password Validator</title>
	<script>
		function checkPassword() {
			var password = document.getElementById('password').value;
			if (password.length == 3 && !isNaN(password)) {
				alert('Password is correct!');
			} else {
				alert('Password is incorrect!');
			}
		}
	</script>
</head>
<body>
	<h1>3-Digit Password Validator</h1>
	<label for='password'>Enter password:</label>
	<input type='text' id='password' name='password'>
	<button onclick='checkPassword()'>Submit</button>
</body>
</html>