D3 Examples - eaflet.js map with line and options v1

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<!DOCTYPE html>
<html>
<head>
    <title>Simple Leaflet Map</title>
    <meta charset="utf-8" />
    <link rel="stylesheet" href="https://unpkg.com/leaflet@1.6.0/dist/leaflet.css"
          integrity="sha512-xwE/Az9zrjBIphAcBb3F6JVqxf46+CDLwfLMHloNu6KEQCAWi6HcDUbeOfBIptF7tcCzusKFjFw2yuvEpDL9wQ=="
          crossorigin=""/></head>
<body>
    <div id="map" style="width: 600px; height: 400px"></div>
​
    <script src="https://unpkg.com/leaflet@1.6.0/dist/leaflet.js"
            integrity="sha512-gZwIG9x3wUXg2hdXF6+rVkLF/0Vi9U8D2Ntg4Ga5I5BZpVkVxlJWbSQtXPSiUTtC0TjtGOmxa1AJPuV0CPthew=="
            crossorigin=""></script>
    <script>
        var map = L.map('map').setView([-41.2858, 174.78682], 14);
        mapLink = 
            '<a href="https://openstreetmap.org">OpenStreetMap</a>';
        L.tileLayer(
            'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
            attribution: '&copy; ' + mapLink + ' Contributors',
            maxZoom: 18,
            }).addTo(map);
​
      var polyline = L.polyline([
            [-41.286, 174.796],
            [-41.281, 174.786],
            [-41.279, 174.776],
            [-41.290, 174.775],
            [-41.292, 174.788]
            ],
            {
                color: 'red',
                weight: 10,
                opacity: .7,
                dashArray: '20,15',
                lineJoin: 'round'
            }
            ).addTo(map);
​
  </script>
</body>
</html>
    