Testing with blockbuilder.org
<!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 margin = {top: 20, right: 10, bottom: 20, left: 10};
var width = 960 - margin.left - margin.right;
var height = 500 - margin.top - margin.bottom;
var svg = d3.select("body").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
// Feel free to change or delete any of the code you see!
svg.append("rect")
.attr({x: 100, y: 100, width: width-200, height: height-200})
.style({ fill: "#a72d1a"})
.transition().duration(3000).ease("bounce")
.style({ fill: "#5db9e3"})
console.log("you are now rocking with d3", d3);
</script>
</body>