Adding a Wrld polyline with elevation

Add a Wrld polyline to a map with elevation.
<!DOCTYPE HTML>
<html>
  <head>
    <script src="https://cdn-webgl.wrld3d.com/wrldjs/dist/latest/wrld.js"></script>
    <link href="https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.0.1/leaflet.css" rel="stylesheet" />
  </head>
  
  <body>
  <div style="position: relative">
    <div id="map" style="height: 400px"></div>
    <script>
      var map = L.Wrld.map("map", "your_api_key_here", {
        center: [55.942953, -3.161405],
        zoom: 15
      });

      var polylinePoints = [
        [55.945976, -3.162339],
        [55.943671, -3.158673],
        [55.941648, -3.159911],
        [55.943248, -3.163275]
      ];

      // Red polyline with altitude offset from terrain height
      var polyTerrainLevel = L.Wrld.polyline(polylinePoints, {
        elevation: 200,
        elevationMode: "heightAboveGround",
        color: "#ff0000ff"
        }).addTo(map);

      // Blue polyline with altitude offset from sea level.
      var polySeaLevel = L.Wrld.polyline(polylinePoints, {
        elevation: 200,
        elevationMode: "heightAboveSeaLevel",
        color: "#0000ffff"
        }).addTo(map);

    </script>

  </div>
  </body>
</html>