Edit in JSFiddle 
<!-- Replace <YOUR_API_ACCESS_TOKEN> with your LocationIQ token before using this code. -->
<!DOCTYPE html>
<html>
    <head>
        <meta charset='utf-8' />
        <title>With Autocomplete API</title>
        <meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
        
        <script src='https://tiles.locationiq.com/v3/libs/maplibre-gl/5.24.0/maplibre-gl.js?v=0.1.9'></script>
        <link href='https://tiles.locationiq.com/v3/libs/maplibre-gl/5.24.0/maplibre-gl.css?v=0.1.9' rel='stylesheet' />
        
        <script src='https://tiles.locationiq.com/v3/libs/liq/liq-styles-ctrl-libre-gl-v5.js?v=0.1.9'></script>
        <link href='https://tiles.locationiq.com/v3/css/liq-styles-ctrl-libre-gl.css?v=0.1.9' rel="stylesheet" />

        <!-- Include the geocoder control -->
        <script src="https://tiles.locationiq.com/v3/libs/gl-geocoder/5.0.0/locationiq-gl-geocoder.min.js?v=0.1.9"></script>
        <link rel="stylesheet" href="https://tiles.locationiq.com/v3/libs/gl-geocoder/5.0.0/locationiq-gl-geocoder.css?v=0.1.9" type="text/css" />

        <!-- Promise polyfill script required to use the geocoder in IE 11 -->
        <script src="https://cdn.jsdelivr.net/npm/es6-promise@4/dist/es6-promise.min.js"></script>
        <script src="https://cdn.jsdelivr.net/npm/es6-promise@4/dist/es6-promise.auto.min.js"></script>
        
        <style>
            body { margin:0px; padding:0px; }
            #map { position:absolute; top:0px; bottom:0px; width:100%; }
        </style>
    </head>

    <body>
        <div id='map'></div>
        <script>
            
            //Add your LocationIQ Access Token here - https://my.locationiq.com/
            locationiq.key = '<YOUR_API_ACCESS_TOKEN>';
            //Define the map and configure the map's theme
            var map = new maplibregl.Map({
                container: 'map',
                style: locationiq.getLayer("Streets"),
                zoom: 12,
                center: [-122.42, 37.779]
            });
            
            //Add Geocoder control to the map
            var locationiqGeocoder = new LocationIQGeocoder({
                accessToken: locationiq.key,
                maplibregl: maplibregl,
                limit: 5,
                dedupe: 1,
                normalizecity: 1,
                bounded: 0,
                importancesort: 0,
                marker: {
                    color: 'red'
                },
                flyTo: {
                    screenSpeed: 7,
                    speed: 4
                }
            });

            map.addControl(locationiqGeocoder, 'top-left');

        </script>
    </body>
</html>