D3 Examples - Font overlap

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<!DOCTYPE html>
<meta charset="utf-8">
<title>Font overlap</title>
        <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<style>
body{
​
}
text{
    text-anchor: middle;
}
</style>
<body>
    <input type="text" id="source"><button id="charge">Update text</button>
<script>
    var W = 1300,
        H = 500;
    
    var svg = d3.select("body")
                .append("svg")
                .attr("width", W)
                .attr("height", H);
    
    function charge(data, t){
        svg.selectAll("text")
            .data(data)
            .enter()
            .append("text")
            .attr("x",W/2)
            .attr("y",H/2)
            .text(t)
            .style("font-size","110px")
            .style("opacity","0.05")
            .style("font-family", function(d){
                return d.font;
            });
    }
    
    d3.csv("data.csv", function(data){
        
        charge(data, 'Tristes tropiques');
        
        d3.select("#charge").on("click",function(){
            var texte = d3.select("#source").node().value;
            svg.selectAll("text")
            .text(texte);
        });  
    }
    );
// Doesn't work because all the different fonts should be joined in a g.
function wrap(text, width) {
  text.each(function() {
    var text = d3.select(this),
        words = text.text().split(/\s+/).reverse(),
        word,
        line = [],
        lineNumber = 0,
        lineHeight = 1, // ems
        y = text.attr("y"),
        dy = parseFloat(text.attr("dy")),
        tspan = text.text(null).append("tspan").attr("x", 0).attr("y", y).attr("dy", dy + "em");
    while (word = words.pop()) {
      line.push(word);
      tspan.text(line.join(" "));
      if (tspan.node().getComputedTextLength() > width) {
        line.pop();
        tspan.text(line.join(" "));
        line = [word];
        tspan = text.append("tspan").attr("x", 0).attr("y", y).attr("dy", lineHeight + dy + "em").text(word);
      }
    }
  });
}  
        
​
                    
</script>
</body>
</html>
    