.enter()

xxxxxxxxxx
 
<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v5.min.js"></script>
</head>
​
<body>
  <div class="chart"></div>
  
  <script>
    
  </script>
</body>
    

https://d3js.org/d3.v5.min.js