D3 Examples - d3js Elevation profile - Ratio automatically chosen

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
    body {
        font: 10px sans-serif;
    }
​
    .axis path,
    .axis line {
      fill: none;
      stroke: #000;
      shape-rendering: crispEdges;
    }
​
    .area {
      fill: steelblue;
    }
​
    line.poi {
        stroke: grey;
        shape-rendering: crispEdges;
    }
    line.poi2 {
        stroke: #000;
        shape-rendering: crispEdges;
    }
    .chart {
        border:1px solid grey;
    }
</style>
<body>
    <div id="chart" class="chart">
    </div>
    <div>Ratio: 1:<span id="ratio"></span></div>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="profile.js"></script>
​
    