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Attach a popup to a marker instance

Attach a popup to a marker and display it on click.

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Attach a popup to a marker instance</title>
    <meta property="og:description" content="Attach a popup to a marker and display it on click." />
    <meta charset='utf-8'>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel='stylesheet' href='https://unpkg.com/maplibre-gl@4.4.0/dist/maplibre-gl.css' />
    <script src='https://unpkg.com/maplibre-gl@4.4.0/dist/maplibre-gl.js'></script>
    <style>
        body { margin: 0; padding: 0; }
        html, body, #map { height: 100%; }
    </style>
</head>
<body>
<style>
    #marker {
        background-image: url('https://maplibre.org/maplibre-gl-js/docs/assets/washington-monument.jpg');
        background-size: cover;
        width: 50px;
        height: 50px;
        border-radius: 50%;
        cursor: pointer;
    }

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

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

<script>
    const monument = [-77.0353, 38.8895];
    const map = new maplibregl.Map({
        container: 'map',
        style: 'https://api.maptiler.com/maps/streets/style.json?key=get_your_own_OpIi9ZULNHzrESv6T2vL',
        center: monument,
        zoom: 15
    });

    // create the popup
    const popup = new maplibregl.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 maplibregl.Marker({element: el})
        .setLngLat(monument)
        .setPopup(popup) // sets a popup on this marker
        .addTo(map);
</script>
</body>
</html>