simple line chart with legend

Simple line chart with legend and mouseover.

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    g.tick line {
            opacity: .1;
        }
​
        path.domain {
            opacity:0;
        }   
  </style>
</head>
​
<body>
  <script src="linechart.js"></script>
</body>
​
    

https://d3js.org/d3.v4.min.js