JS Introduction

<!DOCTYPE html>
<html>
<head>
    <style>
        body { font-family: sans-serif; text-align: center; padding: 30px; }
        .lampu { font-size: 80px; margin: 20px; }
        button { padding: 10px 20px; font-weight: bold; margin: 5px; cursor: pointer; }
    </style>
</head>
<body>
    <h2>JavaScript Mengubah Status Elemen</h2>
    <div id="ikonLampu" class="lampu">💡</div>
    <button onclick="matikanLampu()">Matikan Lampu</button>
    <button onclick="nyalakanLampu()">Nyalakan Lampu</button>

    <script>
        function matikanLampu() {
            document.getElementById('ikonLampu').style.opacity = "0.2";
            document.getElementById('ikonLampu').style.filter = "grayscale(100%)";
        }
        function nyalakanLampu() {
            document.getElementById('ikonLampu').style.opacity = "1";
            document.getElementById('ikonLampu').style.filter = "none";
        }
    </script>
</body>
</html>