spa.html

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Single Page Application</title>
        <style>
        nav a {
            margin: 0 10px;
            text-decoration: none;
            color: blue;
        }
        .active {
            font-weight: bold;
        }
    </style>
    </head>
    <body>
        <nav>
            <a href="#home" id="home-link">Home</a>
            <a href="#about" id="about-link">About</a>
            <a href="#contact" id="contact-link">Contact</a>
        </nav>
        <div id="content">
            <!-- Nội dung sẽ được thay đổi ở đây -->
        </div>

        <script src="app.js"></script>
    </body>
</html>