Calculator_V1

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
  <style>
    body {margin:0;position:fixed;top:0;right:0;bottom:0;left:0;}
    .calccanvas { 
      width:100%; 
      height: 100% 
    }
  </style>
</head>
​
<body>
  <script>
    var oDiv = d3.select("body").append("div");
    var oSVG = oDiv.append("svg").attr("class", "calccanvas");
    oSVG.append("rect").attr("width", "100px").attr("height", "100px").attr("fill", "black");
  </script>
</body>
​
    

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js