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D3.JS - svg shown in github editor, but not in Visual Studio Code - why?

As a D3 beginner, I am currently making a tutorial, using the Github editor. So far everything works. However, when I use the code one to one in my IDE, the black circles are not displayed? How can this be??

index.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">
    <link rel="stylesheet" href="css/styles.css">
    
    <title>Document</title>
    <style>
        body {
            margin: 0;
            overflow: hidden;
        }
    </style>
    <script src="https://d3js.org/d3.v7.min.js"></script>
</head>
<body>
    <p>This is just a test</p>
    <svg id="container" width="960" height="500" ></svg>
       
</body>
</html>

**index.js++

import {select, forceSimulation, forceManyBody, forceLink, forceCenter} from "d3";

const nodes = [
    {"id": "Alice"},
    {"id": "Bob"},
    {"id": "Carol"}
  ];

  const svg = select("#container");
  const width = +svg.attr("width");
  const height = +svg.attr("height");
  const centerX = width / 2;
  const centerY = height / 2;

  const links = [
    {"source": 0, "target": 1}, // Alice → Bob
    {"source": 1, "target": 2} // Bob → Carol
  ];

const simulation = forceSimulation(nodes)
    .force("charge", forceManyBody())
    .force("link", forceLink(links))
    .force("center", forceCenter(centerX, centerY));

const circles = svg.selectAll("circle").data(nodes).enter().append("circle").attr("r", 30);

simulation.on("tick", () => {
    circles.attr("cx", d=>d.x)
    circles.attr("cy", d=>d.y)
});

about 4 years ago · Juan Pablo Isaza

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D3.JS - svg shown in github editor, but not in Visual Studio Code - why?

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