D3 Examples - fresh block

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<!DOCTYPE html>
<html lang="en">
<head>
    <title>I'm Learning D3</title>
    <!-- You will load the D3 library here. -->
  <script src="https://d3js.org/d3.v4.js" charset="utf-8"></script>
</head>
<body>
    <!-- Page elements and content go here. -->
    <svg width="160" height="180">
        <rect x="30" width="20" fill="steelblue"></rect>
        <rect x="55" width="20" fill="steelblue"></rect>
        <rect x="80" width="20" fill="steelblue"></rect>
        <rect x="105" width="20" fill="steelblue"></rect>
    </svg>
    <script>
    <!-- Our D3 code will go here. -->
    var ratData = [40,90,30,60];
    
    d3.selectAll("rect")
         .data(ratData)
         .attr("height",function(d){
      return d;
    });
    
    
    
    
    
    </script>
    
</body>
</html>
    