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Change the case of labels

Use the upcase and downcase expressions to change the case of labels.

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Change the case of labels</title>
    <meta property="og:description" content="Use the upcase and downcase expressions to change the case of labels." />
    <meta charset='utf-8'>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel='stylesheet' href='https://unpkg.com/maplibre-gl@5.0.1/dist/maplibre-gl.css' />
    <script src='https://unpkg.com/maplibre-gl@5.0.1/dist/maplibre-gl.js'></script>
    <style>
        body { margin: 0; padding: 0; }
        html, body, #map { height: 100%; }
    </style>
</head>
<body>
<div id="map"></div>
<script>
    const map = new maplibregl.Map({
        container: 'map', // container id
        style:
            'https://api.maptiler.com/maps/streets/style.json?key=get_your_own_OpIi9ZULNHzrESv6T2vL', // stylesheet location
        center: [-116.231, 43.604], // starting position [lng, lat]
        zoom: 11 // starting zoom
    });

    map.on('load', () => {
        // data from https://opendata.cityofboise.org/
        map.addSource('off-leash-areas', {
            'type': 'geojson',
            'data':
                'https://maplibre.org/maplibre-gl-js/docs/assets/boise.geojson'
        });
        map.addLayer({
            'id': 'off-leash-areas',
            'type': 'symbol',
            'source': 'off-leash-areas',
            'layout': {
                'icon-image': 'dog_park',
                'text-field': [
                    'format',
                    ['upcase', ['get', 'FacilityName']],
                    {'font-scale': 0.8},
                    '\n',
                    {},
                    ['downcase', ['get', 'Comments']],
                    {'font-scale': 0.6}
                ],
                'text-font': ['Open Sans Semibold', 'Arial Unicode MS Bold'],
                'text-offset': [0, 0.6],
                'text-anchor': 'top'
            }
        });
    });
</script>
</body>
</html>