d3.js major minor tick style 3

<!DOCTYPE html>
<meta charset="utf-8">
<style>
 
.axis text {
  font: 10px sans-serif;
}
 
.axis path {
  fill: none;
  stroke: #000;
  stroke-width: 2.5px;
  shape-rendering: crispEdges;
}
 .axis line {
  fill: none;
  stroke: green;
  stroke-width: 1.6px;
}

.axis .minor {
  stroke: red;
  stroke-width: 0.4px;
}
  
</style>
<body>
<script src="https://d3js.org/d3.v2.min.js?2.10.0"></script>
<script>
 
var margin = {top: 100, right: 100, bottom: 100, left: 100},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
 
var x = d3.time.scale()
    .domain([new Date, new Date])
    .nice(d3.time.week)
    .range([0, width]);
 
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")
    .call(d3.svg.axis().scale(x).orient("bottom").ticks(16).tickSubdivide(3).tickSize(-60, -60, 0));
 
</script>

Modified http://d3js.org/d3.v2.min.js?2.10.0 to a secure url

https://d3js.org/d3.v2.min.js?2.10.0