Old school D3 from simpler times

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lordliquid

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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>
  <script>
    var svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500)

let group = svg.append('g')
      .attr('transform', 'translate(200, 200)')
    
    let line = group.append('path').attr('class', 'line');
    
    var i = 1;
    
    function complete() {
      d3.select('.line')
        .style('fill', 'green')
    }
    
    function myLoop() {
      setTimeout(function() {
        i++;
        d3.select('.line')
          .transition()
          .duration(250)
        	.ease(d3.easeLinear)
          .attr('d', 
         `M ${0} ${0} C ${i* 2} ${i *2} ${i * 2} ${0} ${100} ${0}`
        );
        if (i < 250) {
        	myLoop();
        } else {
          complete();
        }
      }, 20);

}
    
    myLoop();
  </script>
</body>

https://d3js.org/d3.v4.min.js