D3 Examples - Showing tooltips above a different element with d3-tip

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
rect {
  stroke: #aaa;
  stroke-width: 1px;
  fill: #eee;
}
​
.d3-tip {
  line-height: 1;
  font-weight: bold;
  padding: 12px;
  background: rgba(0, 0, 0, 0.8);
  color: #fff;
  border-radius: 2px;
}
​
/* Creates a small triangle extender for the tooltip */
.d3-tip:after {
  box-sizing: border-box;
  display: inline;
  font-size: 10px;
  width: 100%;
  line-height: 1;
  color: rgba(0, 0, 0, 0.8);
  content: "\25BC";
  position: absolute;
  text-align: center;
}
​
/* Style northward tooltips differently */
.d3-tip.n:after {
  margin: -1px 0 0 0;
  top: 100%;
  left: 0;
}
</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="d3tip.js"></script>
<script>
​
var width = 960,
    height = 500;
​
var tip = d3.tip()
  .attr('class', 'd3-tip')
  .offset([-10, 0])
  .html(function(d) {
    return "You're touching my " + d.name + "!";
  });
​
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
  .append("g")
    .attr("transform", "translate(100,100)");
​
svg.call(tip);
​
var data = [
  {
    width: 30,
    height: 120,
    transform: "translate(100,200)rotate(30)",
    name: "right leg",
  },
  {
    width: 30,
    height: 120,
    transform: "translate(140,215)rotate(-30)",
    name: "left leg",
  },
  {
    width: 40,
    height: 100,
    transform: "translate(115,90)",
    name: "torso",
  },
  {
    width: 60,
    height: 60,
    transform: "translate(105,20)",
    name: "head",
  },
  {
    width: 20,
    height: 10,
    transform: "translate(130,60)",
    name: "mouth",
  },
  {
    width: 10,
    height: 10,
    transform: "translate(115,35)",
    name: "right eye",
  },
  {
    width: 10,
    height: 10,
    transform: "translate(145,35)",
    name: "left eye",
  },
  {
    width: 20,
    height: 90,
    transform: "translate(40,40)rotate(-30)",
    name: "right arm",
  },
  {
    width: 20,
    height: 90,
    transform: "translate(210,35)rotate(30)",
    name: "left arm",
  },
];
​
svg.selectAll("rect")
    .data(data)
  .enter().append("rect")
    .attr("id", function(d) { return d.name.replace(" ", "-") })
    .attr("width", function(d) { return d.width })
    .attr("height", function(d) { return d.height })
    .attr("transform", function(d) { return d.transform })
    .on("mouseover", function(d) { tip.show(d, document.getElementById("head")) })
    .on("mouseout", tip.hide);
​
</script>
    