QGIS/resources/server/api/ogc/templates/wfs3/leaflet_map.html

<!-- template for the WFS3 API leaflet map -->
<div class="col-md-6">
    <div id="mapid" class="small"></div>

    <script type="text/javascript">
    jQuery( document ).ready(function( $ ) {
        var map = L.map( 'mapid', { attributionControl: false } ).setView( [0, 0], 13 );
        L.control.attribution( {  prefix: false } ).addTo( map );
        L.control.fullscreen({
            title: 'Enter fullscreen',
            titleCancel: 'Exit fullscreen',
        }).addTo(map);
        L.tileLayer('https://tile.openstreetmap.org/{z}/{x}/{y}.png', {
            attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
        }).addTo(map)
        $.get( "{{ metadata.geojsonUrl }}", function( data ) {
          var jl = L.geoJSON( data, {
              onEachFeature: function (feature, layer) {
                    layer.bindPopup('<h1>'+feature.id +'</h1>');
              }
          }).addTo(map);
          map.setView(jl.getBounds().getCenter());
          if ( jl.getBounds().getEast() != jl.getBounds().getWest() && jl.getBounds().getNorth() != jl.getBounds().getSouth() )
          {
            map.fitBounds(jl.getBounds());
          }
        });
    });

    </script>
</div>