http://tutorials.jenkov.com/svg/symbol-element.html

stroke-width

stroke

        line = d3.line().x(function(d) {return d[0];} ).y(function(d) { return d[1]} ) ;
        canvas.append("path") 
            .attr("d", line([[0, 0], [getElemWidth(canvas), 0]]))
            .attr("stroke-width", 4)
            .attr("stroke", "#CDD5DE")
        ;

canvas.append("svg:image") 
        .attr("transform","translate("+[ x-20,y-20 ]+")") 
        .attr('width', 40)
        .attr('height', 40)
        .attr("xlink:href", "Icons/" + picName)
;