D3 Examples - gapminder with highlighting

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<!DOCTYPE html>
<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);
    
​
​
    d3.csv("gapminder_avg.csv",function(dataWeLoaded) {
      //console.log(dataWeLoaded);
      
      var xScale = d3.scaleLinear()
          .domain([0,40000])
        .range([100,800]);
      var yScale = d3.scaleLinear()
          .domain([30,80])
        .range([400,100]);
      var rScale = d3.scaleSqrt()
          .domain([0,d3.max(dataWeLoaded, function(d) { return +d.population;})])
        .range([0,50]);
      
      var colorScale = d3.scaleOrdinal(d3.schemeCategory10);
      
        svg.selectAll("circle")
            .data(dataWeLoaded)
        .enter()
            .append("circle")
          .attr("cy", function(d) { return yScale(+d.lifeexp);})
                //return 500-(d.lifeexp*6);})
          .attr("cx", function(d) { return xScale(+d.gdp);})
            //return 100+(d.gdp/100);})
            .attr("r", function(d) { return rScale(+d.population) /* 1 + (d.population/10000000); */ })
          .attr("fill-opacity",0.4)
          .attr("stroke","black")
          .attr("stroke-width",2)
          .attr("stroke-opacity",1)
          .attr("fill",function(d) { return colorScale(d.region);})
          .on("mouseover", function(d) {
            d3.select(this)
              .attr("fill","yellow")
              .transition()
              .attr("r", function(d) { return 1.5*rScale(+d.population);})
          })
          .on("mouseout", function(d) {
            d3.select(this)
              .attr("fill",function(d) { return colorScale(d.region);})
              .transition()
              .attr("r", function(d) { return rScale(+d.population);})
          })
        
      var leftAxis = d3.axisLeft(yScale);
      var bottomAxis = d3.axisBottom(xScale);
​
      svg.append("g")
          .attr("transform", "translate(100,0)")
          .call(leftAxis);
​
      svg.append("g")
          .attr("transform", "translate(0,400)")
          .call(bottomAxis);
​
      svg.append("text")
          .text("life expectancy")
          .attr("transform", "translate(60,90)")
          .attr("font-size",10)
          .attr("font-family","sans-serif")
​
      svg.append("text")
          .text("gdp per capita")
          .attr("transform", "translate(770,430)")
          .attr("font-size",10)
          .attr("font-family","sans-serif")
​
    })
    
  </script>
</body>
​
    