index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Frequencies visualizer</title>
    <link rel="stylesheet" href="main.css"/>
    <link rel="manifest" href="manifest.webmanifest">
    <script>
        window.addEventListener('load', () => {
            navigator.serviceWorker.register('/sw.js');
        });
    </script>
</head>
<body>
    <div class="canvas_container">
        <canvas height=100 width=100>

        </canvas>
        <audio controls="controls" preload>
            Il tuo browser non supporta l'elemento <code>audio</code>.
            <source src="./resources/audio_sample.mp3">
        </audio> 
    </div>
    <div class="audio_container">
           
    </div>
    
    <script src=main.js></script>
</body>
</html>