Attach a popup to a marker instance | Mapbox GL JS

Attach a Popup to a Marker and display it on click.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Attach a popup to a marker instance</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<link href="https://api.mapbox.com/mapbox-gl-js/v3.3.0/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v3.3.0/mapbox-gl.js"></script>
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<style>
    #marker {
        background-image: url('https://docs.mapbox.com/mapbox-gl-js/assets/washington-monument.jpg');
        background-size: cover;
        width: 50px;
        height: 50px;
        border-radius: 50%;
        cursor: pointer;
    }

    .mapboxgl-popup {
        max-width: 200px;
    }
</style>

<div id="map"></div>

<script>
	// TO MAKE THE MAP APPEAR YOU MUST
	// ADD YOUR ACCESS TOKEN FROM
	// https://account.mapbox.com
	mapboxgl.accessToken = 'YOUR_MAPBOX_ACCESS_TOKEN';
    const monument = [-77.0353, 38.8895];
    const map = new mapboxgl.Map({
        container: 'map',
        // Choose from Mapbox's core styles, or make your own style with Mapbox Studio
        style: 'mapbox://styles/mapbox/light-v11',
        center: monument,
        zoom: 15
    });

    // create the popup
    const popup = new mapboxgl.Popup({ offset: 25 }).setText(
        'Construction on the Washington Monument began in 1848.'
    );

    // create DOM element for the marker
    const el = document.createElement('div');
    el.id = 'marker';

    // create the marker
    new mapboxgl.Marker(el)
        .setLngLat(monument)
        .setPopup(popup) // sets a popup on this marker
        .addTo(map);
</script>

</body>
</html>
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