7.2 transition | multiple

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<html>
<head>

<link href="https://fonts.googleapis.com/css2?family=Montserrat+Alternates:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&family=Montserrat:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&family=Roboto:ital,wght@0,100;0,300;1,100;1,300&display=swap" rel="stylesheet">

<script src="https://d3js.org/d3.v3.min.js"></script>

<p id="h1">TRANSITION | MULTIPLE</p>
<div id="link">by
<a href="https://slides.com/sandravizmad">SANDRA</a></div>

<style>

/*Defining text stylings*/

#h1 {
  font-size:30px;
  margin:30px 0px 0px 20px;
  color:#f5fa91;
  font-family: 'Montserrat Alternates', sans-serif;
  font-weight:300;
}

#link {
	font-family:'Montserrat Alternates', sans-serif;
  font-weight:200;
  font-size:10px;
	margin:5px 0px 0px 22px;
  color:white;
}

a:link, a:visited, a:active {
	text-decoration: none;
  color:white;
  border-bottom:1.5px dotted white;
}

body {
  background-color:#011227;
}

/*Defining chart stylings*/

circle{
  opacity:0.6;
}

</style>
</head>

//Margin conventions
var m = {top:100, right:50, bottom:50, left:50}
    w = 600 - m.left - m.right,
    h = 600 - m.top - m.bottom;

//Container
var svg = d3.select("body")
    .append("svg")
    .attr("width", w + m.left + m.right)
    .attr("height", h + m.top + m.bottom)
    .append("g")
    .attr("transform", `translate(${m.left}, ${m.top})`);

// Dataset as an array
var data = [5, 8.5, 8, 7, 6, 6.5, 9, 2];

//First transition
svg.selectAll("circle")
   .data(data)
   .enter()
   .append("circle")
   .style("fill", "#85f6fa")
   .attr("cx", (d, i) => i*20)
   .attr("r", d => d)
   .attr("cy", "10%")
   .transition()
   .duration(2000)
   .ease("bounce")
   .style("fill", "#8ff798")
   .attr("cx", (d, i) => i*40)
   .attr("r", d => d*3.5)
   .attr("cy", "30%");

//Second transtion
d3.selectAll("circle")
  .transition()
  .delay(2000)
  .duration(4000)
  .attr("cx", (d, i) => i*60)
  .attr("r", d => d)
  .attr("cy", "50%")
  .style("fill", "#f5fa91")
  .transition()
  .duration(4000)
  .attr("cy", "20%")
  .transition()
  .duration(4000)
  .attr("r", d => d*5)
  .attr("cy", "30%");

</script>
</body>
</html>

https://d3js.org/d3.v3.min.js