Portion of label bold - the rest not bold

I'm using d3.js and the following snippet renders labels around a pie chart:

    .attr("dy", ".35em")
    .style("opacity", 0.01)
    .text(function(d) {
        return (d.data.NAME + ": " + d.data.amount);

So a label might read Jimmy: 100

How do I make d.data.NAME render in a bold style but d.data.amount should not be bold ?



One solution is using a <tspan> element with a different font-weight for your d.data.amount.

Check the demo:

var svg = d3.select("svg");
var text = svg.append("text")
  .attr("x", 10)
  .attr("y", 30)
  .attr("font-weight", 700)
  .text("This is bold...")
  .attr("font-weight", 300)
  .text(" but this is not.")
<script src="https://d3js.org/d3.v4.min.js"></script>

In your case, it should be something like this:

.style("font-weight", 700)
.text(function(d) {
    return d.data.NAME + ": ";
.style("font-weight", 300)
.text(function(d) {
    return d.data.amount;


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