d3 append("g") code example

Example: d3 paning

var svg = d3.select("body")
  .append("svg")
  .attr("width", "100%")
  .attr("height", "100%")
  .call(d3.behavior.zoom().on("zoom", function () {
    svg.attr("transform", "translate(" + d3.event.translate + ")" + " scale(" + d3.event.scale + ")")
  }))
  .append("g")