index3.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <canvas></canvas>
    <svg></svg>
    <div id="demo"></div>
</body>
<script src="https://d3js.org/d3.v7.min.js"></script>
<script>
    var audioContext=new AudioContext();
    var oscilator=audioContext.createOscillator();
    oscilator.connect(audioContext.destination);
    // oscilator.start();
    setTimeout(function(){
        oscilator.stop();
    },2000);
    var svg=d3.select("#demo")
                .append('svg')
                .attr("width", this.width + this.margin.left + this.margin.right)
				.attr("height", this.height + this.margin.top + this.margin.bottom)
				.append("g")
</script>
</html>