JS Window API

<!DOCTYPE html>
<html>
<body style="font-family: sans-serif; padding: 20px;">
    <h2>Informasi Jendela Browser</h2>
    <p id="infoLayar"></p>

    <script>
        document.getElementById('infoLayar').innerHTML = 
            "Lebar Layar Browser: <strong>" + window.innerWidth + " px</strong><br>" +
            "Tinggi Layar Browser: <strong>" + window.innerHeight + " px</strong><br>" +
            "Alamat URL Saat Ini: <small>" + window.location.href + "</small>";
    </script>
</body>
</html>