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I still not understanding why the code bellow does not display its labels / text... I have defined the css and set the attribute like the title when the move is over the node: Json: { "nodes":[ {"name":"t1","group":1}, {"name":"t2","group":1}, {"name":"t3","group":1}, {"name":"t4","group":1}, {"name":"hate","group":2}, {"name":"good","group":2}, {"name":"aiport","group":3}, {"name":"flight","group":3} ], "links":[ {"source":0,"target":4,"value":4}, {"source":0,"target":5,"value":4}, {"source":1,"target":4,"value":4}, {"source":2,"target":5,"value":4}, {"source":3,"target":5,"value":4}, {"source":4,"target":6,"value":4}, {"source":5,"target":6,"value":4}, {"source":5,"target":7,"value":4} ] } Code: <!DOCTYPE html> <meta charset="utf-8"> <style> .node { fill: #555; stroke: #999; stroke-width: 1.5px; } .link { stroke: #999; stroke-opacity: .6; } </style> <body> <script src="http://d3js.org/d3.v3.min.js"></script> <script> var width = 1024, height = 768; var color = d3.scale.category20(); var force = d3.layout.force() .charge(-120) .linkDistance(30) .size([width, height]); var svg = d3.select("body").append("svg") .attr("width", width) .attr("height", height); d3.json("data.json", function(error, graph) { force .nodes(graph.nodes) .links(graph.links) .start(); var link = svg.selectAll("line.link") .data(graph.links) .enter().append("line") .attr("class", "link") .style("stroke-width", function(d) { return Math.sqrt(d.value); }); var node = svg.selectAll("circle.node") .data(graph.nodes) .enter().append("circle") .attr("class", "node") .attr("r", 5) .s

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