Line Chart with Grid [D3]

<!doctype html>
<html lang="ja">
<head>
  <meta charset="UTF-8">
  <title>Line Chart</title>
<style>

.axis path,
  .axis line{
    fill: none;
    stroke: black;
  }

.line{
    fill: none;
    stroke: blue;
    stroke-width: 2px;
  }

.tick text{
    font-size: 12px;
  }

.tick line{
    opacity: 0.2;
  }

</style>
</head>
<body>
<script src="https://d3js.org/d3.v3.js"></script>
<script>

var margin = {top: 20, right: 100, bottom: 30, left: 100},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var dataset = [
  {x: 0, y: 5},
  {x: 1, y: 8},
  {x: 2, y: 13},
  {x: 3, y: 12},
  {x: 4, y: 16},
  {x: 5, y: 21},
  {x: 6, y: 18},
  {x: 7, y: 23},
  {x: 8, y: 24},
  {x: 9, y: 28},
  {x: 10, y: 35},
  {x: 11, y: 30},
  {x: 12, y: 32},
  {x: 13, y: 36},
  {x: 14, y: 40},
  {x: 15, y: 38},
];

var xScale = d3.scale.linear()
    .domain([0, d3.max(dataset, function(d){ return d.x; })])
    .range([0, width]);

var yScale = d3.scale.linear()
    .domain([0, d3.max(dataset, function(d){ return d.y; })])
    .range([height, 0]);

var xAxis = d3.svg.axis()
    .scale(xScale)
    .orient("bottom")
    .innerTickSize(-height)
    .outerTickSize(0)
    .tickPadding(10);

var yAxis = d3.svg.axis()
    .scale(yScale)
    .orient("left")
    .innerTickSize(-width)
    .outerTickSize(0)
    .tickPadding(10);

var line = d3.svg.line()
    .x(function(d) { return xScale(d.x); })
    .y(function(d) { return yScale(d.y); });

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 + ")");

svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis)

svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)

svg.append("path")
      .data([dataset])
      .attr("class", "line")
      .attr("d", line);

</script>
</body>
</html>

Modified http://d3js.org/d3.v3.js to a secure url

https://d3js.org/d3.v3.js