Create a draggable Marker

Create a draggable Marker
Drag the Marker to a new location on a map and populates its coordinates in a display.
<!DOCTYPE html>
<html>
<head>
    <meta charset='utf-8' />
    <title>Create a draggable Marker</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>


<style>
.coordinates {
    background: rgba(0,0,0,0.5);
    color: #fff;
    position: absolute;
    bottom: 10px;
    left: 10px;
    padding:5px 10px;
    margin: 0;
    font-size: 11px;
    line-height: 18px;
    border-radius: 3px;
    display: none;
}
</style>

<div id='map'></div>
<pre id='coordinates' class='coordinates'></pre>

<script>
mapboxgl.accessToken = '<your access token here>';
var coordinates = document.getElementById('coordinates');
var map = new mapboxgl.Map({
    container: 'map',
    style: 'mapbox://styles/mapbox/streets-v9',
    center: [0, 0],
    zoom: 2
});

var marker = new mapboxgl.Marker({
    draggable: true
})
    .setLngLat([0, 0])
    .addTo(map);

function onDragEnd() {
    var lngLat = marker.getLngLat();
    coordinates.style.display = 'block';
    coordinates.innerHTML = 'Longitude: ' + lngLat.lng + '<br />Latitude: ' + lngLat.lat;
}

marker.on('dragend', onDragEnd);
</script>

</body>
</html>
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