D3 Examples - Line bias

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://cdn.jsdelivr.net/npm/vega@5"></script>
    <script src="https://cdn.jsdelivr.net/npm/vega-embed@4"></script>
</head>
​
<body>  
  <p>
    Click and drag anywhere in the chart to set the average.
  </p>
  
  
  <div id="vis"></div>
  
  <script>
    const spec = "line.json";
    vegaEmbed('#vis', spec, {actions: false})
        // result.view provides access to the Vega View API
      .then(result => {
        result.view.addSignalListener("average", console.log);
        })
      .catch(console.warn);
  </script>
</body>
    