D3 Examples - 3.7 scaled circles

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<!DOCTYPE html>
<meta charset="utf-8">
<html>
<head>
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<!-- Google fonts reference-->
<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">
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<!-- Connecting with D3 library-->
<script src="https://d3js.org/d3.v4.min.js" charset="utf-8"></script>
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<style>
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/*Defining text stylings*/
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#h1 {
  font-size:30px;
  margin:30px 0px 0px 20px;
  color:#f5fa91;
  font-family:'Montserrat Alternates', sans-serif;
  font-weight:300;
}
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#link {
    font-family:'Montserrat Alternates', sans-serif;
  font-weight:200;
  font-size:10px;
    margin:5px 0px 0px 22px;
  color:white;
}
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a:link, a:visited, a:active {
    text-decoration: none;
  color:white;
  border-bottom:1.5px dotted white;
}
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body {
  background-color:#011227;
}
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/*Defining chart stylings*/
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circle {
  fill-opacity:0.8;
}
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text {
  font-family:'Montserrat',sans-serif;
  font-size:14px;
  font-weight:300;
  fill:#f5fa91;
}
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</style>
</head>
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<body>
  
<!-- Creating the headlines -->
<p id="h1">SCALED CIRCLES</p>
<div id="link">by
<a href="https://slides.com/sandravizmad">SANDRA</a></div>  
  
<script>
​
//Margin conventions
var m = {top:100, right:50, bottom:50, left:40}
    w = 700 - m.left - m.right,
    h = 700 - 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
var data = [[7, 40], [240, 40], [120, 150], [90, 13], [140, 15],[210, 62],
    [275, 44], [155, 77], [65, 30], [220, 88],[100, 28],[120, 48],[20, 78]];
​
//X scale
var x = d3.scaleLinear()
    .domain([0, d3.max(data, d => d[0])])
    .range([0, w]);
​
//Y scale
var y = d3.scaleLinear()
    .domain([0, d3.max(data, d => d[1])])
    .range([h, 50]);
​
//Size scale
var r = d3.scaleSqrt()
    .domain(d3.extent(data, d => d[1]))
    .range([30, 100]);
​
//Color scale
var c = d3.scaleLog()
    .domain(d3.extent(data, d => d[1]))
    .range(["#8ff798", "#85f6fa"]);
​
//Draw the circles
svg.selectAll("circle")
    .data(data)
    .enter()
    .append("circle")
    .attr("cx", d => x(d[0]))
    .attr("cy", d => y(d[1]))
    .attr("r", d => r(d[1]))
    .attr("fill", d => c(d[1]));
​
//Add the text
svg.selectAll("text")
    .data(data)
    .enter()
    .append("text")
    .text(d => d[1] + "  |  " + d[0])
    .attr("x", d => x(d[0] - 7))
    .attr("y", d => y(d[1] - 1));
​
</script>
</body>
</html>
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