D3byEX 9.6: Donut Segment (Adapted to D3.js v4)
<!DOCTYPE html>
<html><meta charset=utf-8>
<head>
<meta name="description" content="D3.js v4, arc, donut segment, d3.arc" />
</head>
<body>
<script src="http://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/d3-selection-multi.v1.min.js"></script>
<script>
svg = d3.select('body')
.append('svg');
var generator = d3.arc() // v4
.innerRadius(40)
.outerRadius(60)
.startAngle(45 * Math.PI * 2 / 360)
.endAngle(105 * Math.PI * 2 / 360);
svg.append('path')
.attrs({ d: generator, transform: 'translate(65, 65)', // v4
fill: 'cyan', stroke: 'black' });
</script>
</body>
</html>