D3 Examples - d3js superformula mathematical force of nature forms or the beauty of the symmetry of the area invariant

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<!DOCTYPE html>
<meta charset="utf-8">
<title>Superformula</title>
<style>
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path {
  stroke-width: 1.5px;
  stroke: #666;
  fill: #ddd;
}
​
#controls {
  position: absolute;
  width: 270px;
  font: 8px sans-serif;
}
​
#controls span,
#controls label {
  position: relative;
  top: -5px;
  padding: 5px;
  display: inline-block;
  width: 8px;
}
​
#controls button {
  font: 10px sans-serif;
  padding: 5px;
  width: 70px;
}
​
</style>
<div id="controls"></div>
<script src="d3.v4.js"></script>
<script src="superformula.js"></script>
<script src="index.js"></script>
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