D3 Examples - 3.2 venn diagram

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<!DOCTYPE html>
<meta charset="utf-8">
<html>
<head>
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<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.v3.min.js"></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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#circle1 {
   fill:#f5fa91;
   opacity:0.5;
}
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#circle2 {
   fill:#8ff798;
   opacity:0.5;
}
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#circle3 {
   fill:#85f6fa;
   opacity:0.5;
}
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</style>
</head>
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<body>
  
<!-- Creating the headlines -->
<p id="h1">VENN DIAGRAM </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})`);
​
//Define the 1. circle
svg.append("circle")
    .attr("id", "circle1")
    .attr("cx", 200)
    .attr("cy", 250)
    .attr("r", 200);
​
//Define the 2. circle
svg.append("circle")
    .attr("id","circle2")
    .attr("cx", 400)
    .attr("cy", 250)
    .attr("r", 200);
​
//Define the 3. circle
svg.append("circle")
    .attr("id", "circle3")
    .attr("cx", 300)
    .attr("cy", 400)
    .attr("r", 200);
​
</script>
</body>
</html>
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