Old school D3 from simpler times

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greenmna

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>

<body>
  <script>
    var svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500)

var flag = [{"fill": "#FFFFFF", "x":250, "y": 150, "height": 75}, {"fill": "#C8102E", "x":250, "y": 225, "height": 75}, {"cx": 50, "cy": 50, "r": 50, "fill": "#C8102E"}];
       
		console.log(flag);
    
		svg.selectAll() 
    	.data(flag)
    	.enter()
    	.append("rect")   
    	.attr("y", function (d) {return d.y})
    	.attr("x", function(d) {return d.x;})
     	.attr("width", 300)
    	.attr("height", function (d){return d.height})
     	.attr("fill", function (d) {return d.fill;})
    	.attr("stroke", "black")
   
    	.append("circle")
    	.attr("cx", function (d) {return d.cx})
    	.attr("cy", function (d) {return d.cy})
    	.attr("r", function (d) {return d.r})
    	.attr("fill", function (d) {return d.fill})
  </script>
</body>

https://d3js.org/d3.v4.min.js