Arrows ?

<!DOCTYPE html>
<html>
<head>
    <title>Arrows</title>
    <meta charset="utf-8" />

</head>

var svg = d3.select("body") // select the 'body' element
      .append("svg")           // append an SVG element to the body
      .attr("width", 600)      
      .attr("height", 600);

d3.csv("myarrows.csv", dottype1, function(error, lines) {
  
svg.append("g")
      .selectAll("line")
      .data(lines)
      .enter()
      .append("line")
      .attr("x1", function(d) { return d.x1; })
      .attr("y1", function(d) { return d.y1; })
      .attr("x2", function(d) { return d.x2; })
      .attr("y2", function(d) { return d.y2; })
      .attr("marker-end", "url(#triangle)") // add the marker
      .style("stroke", "brown")           // colour the line
      .style("stroke-width", 4)          // adjust line width
      .style("stroke-linecap", "square") // stroke-linecap type
               ;

svg.append("svg:defs")
      .append("svg:marker") 
      .attr("id", "triangle")
      .attr('viewBox', '0 -5 10 10')
      .attr('refX', 6)
      .attr('markerWidth', 4)
      .attr('markerHeight', 4)
      .style("stroke", "brown") 
       .style("fill", "brown")           // colour the line
      .attr('orient', 'auto')
      .append('svg:path')
        .attr('d', 'M0,-5L10,0L0,5')
                 ;
});

function dottype1(d) {
  d.x1 = +d.x1x1;
  d.y1 = +d.y1y1;
  d.x2 = +d.x2x2;
  d.y2 = +d.y2y2;
   return d;
}

</script>

</body>
</html>

Modified http://d3js.org/d3.v3.js to a secure url

https://d3js.org/d3.v3.js