French Flag

<!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; }
    svg { width:100%; height: 100% }
  </style>
</head>

<body>
  <script>
    
    var canvas = d3.select("body")
   								.append("svg")
   								.attr("x", 500)
   								.attr("y", 500)
   								.append("g")
   								.attr("stroke", "white");
   
   var blue = canvas.append("rect")
   									.attr("fill", "	#0055A4")
   									.attr("width", 300)
   									.attr("height", 600)
   									.attr("x", 50)
   									.attr("y", 50);
   
   var white = canvas.append("rect")
    									.attr("fill", "	#FFFFFF")
    									.attr("width", 300)
    									.attr("height", 600)
    									.attr("x", 350)
    									.attr("y", 50);
    
    var red = canvas.append("rect")
    								.attr("fill", "	#EF4135")
    								.attr("width", 300)
    								.attr("height", 600)
    								.attr("x", 650)
    								.attr("y", 50);
    
  </script>
</body>

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