Add a vector tile source

Add a vector tile source
<!DOCTYPE html>
<html>
<head>
    <meta charset='utf-8' />
    <title>Add a vector tile source</title>
    <meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
    <script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.52.0/mapbox-gl.js'></script>
    <link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.52.0/mapbox-gl.css' rel='stylesheet' />
    <style>
        body { margin:0; padding:0; }
        #map { position:absolute; top:0; bottom:0; width:100%; }
    </style>
</head>
<body>

<div id='map'></div>
<script>
mapboxgl.accessToken = '<your access token here>';
var map = new mapboxgl.Map({
    container: 'map',
    style: 'mapbox://styles/mapbox/light-v9',
    zoom: 13,
    center: [-122.447303, 37.753574]
});

map.on('load', function () {

    map.addLayer({
        "id": "terrain-data",
        "type": "line",
        "source": {
            type: 'vector',
            url: 'mapbox://mapbox.mapbox-terrain-v2'
        },
        "source-layer": "contour",
        "layout": {
            "line-join": "round",
            "line-cap": "round"
        },
        "paint": {
            "line-color": "#ff69b4",
            "line-width": 1
        }
    });
});
</script>

</body>
</html>
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