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galery with examples

logging

      function log(sel,msg) {
         console.log(msg,sel);
      }


    svg
      .append("text")
      .attr("x", 0)
      .attr("y", -20)
      .attr("class", "svg_diagram_title")
      .text(title)
      .call(log,title)
      ;

diagram not showing

if you don't see any images - check your selector, 
D3 will not complain about 'target element not found '!!!!

SOLUTION: fast and small example

<html lang="en">
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <script src="d3.v5.js"></script>
</head>
<body>
  <svg id="dataviz_area" height=200 width=450></svg>
  <script>
    // MUST BE DECLARED AFTER TARGET ELEMENT DECLARATION
    d3.select("#dataviz_area").append("div").html("hello")
  </script>
</body>
</html>