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<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