D3 Examples - Modifying SVG Dynamically

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>
​
<body>
  <svg>
    <rect />
    <circle />
    <rect />
    <circle />
  </svg>
  <script>
    // Feel free to change or delete any of the code you see in this editor!
    const svg = d3.select('svg');
    const rectangles = d3.selectAll('rect');
    const circles = d3.selectAll('circle');
    
    rectangles
        .attr('')
​
    svg.append("text")
      .text("Edit the code below to change me!")
      .attr("y", 200)
      .attr("x", 120)
      .attr("font-size", 36)
      .attr("font-family", "monospace")
​
  </script>
</body>
​
    