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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>
// Feel free to change or delete any of the code you see in this editor!
var svg = d3.select("body").append("svg")
.attr("width", 960)
.attr("height", 500)
svg.append("g")
.append('rect')
var rect = svg.select('rect')
.attr('x', 20)
.attr('y', 20)
.attr('width', 200)
.attr('height', 200)
.attr('fill', 'none')
.attr('stroke', 'black')
var t = d3.transition()
.duration(2000)
.ease(d3.easeLinear)
rect.transition(t)
.attr('x',50)
.attr('width', '100')
</script>
</body>
https://d3js.org/d3.v4.min.js