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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 flag_data = [
{
"color": "#009246",
"width": 200,
"height": 400,
"x": 100,
"y": 50
},
{
"color": "#F1F2F1",
"width": 200,
"height": 400,
"x": 300,
"y": 50
},
{
"color": "#CE2B37",
"width": 200,
"height": 400,
"x": 500,
"y": 50
}
];
var svg = d3.select("body").append("svg")
.attr("width", 960)
.attr("height", 500);
svg.selectAll("rect").data(flag_data).enter().append("rect")
.attr("fill", function(d) {return d["color"];})
.attr("width", function(d) {return d["width"];})
.attr("height", function(d) {return d["height"];})
.attr("x", function(d) {return d["x"];})
.attr("y", function(d) {return d["y"];});
</script>
</body>
https://d3js.org/d3.v4.min.js