Get features under the mouse pointer
Using the queryRenderedFeatures API to show properties of hovered-over map elements.
<!DOCTYPE html>
<html>
<head>
    <meta charset='utf-8' />
    <title></title>
    <meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
    <script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.37.0/mapbox-gl.js'></script>
    <link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.37.0/mapbox-gl.css' rel='stylesheet' />
    <style>
        body { margin:0; padding:0; }
        #map { position:absolute; top:0; bottom:0; width:100%; }
    </style>
</head>
<body>

<style>
    #features {
        position: absolute;
        top: 0;
        right: 0;
        bottom: 0;
        width: 300px;
        overflow: auto;
        background: rgba(255, 255, 255, 0.8);
    }
    #map canvas {
        cursor: crosshair;
    }
</style>
<div id='map'></div>
<pre id='features'></pre>
<script>
mapboxgl.accessToken = '<your access token here>';
var map = new mapboxgl.Map({
    container: 'map',
    style: 'mapbox://styles/mapbox/streets-v9',
    center: [-96, 37.8],
    zoom: 3
});

map.on('mousemove', function (e) {
    var features = map.queryRenderedFeatures(e.point);
    document.getElementById('features').innerHTML = JSON.stringify(features, null, 2);
});
</script>

</body>
</html>
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