viewof map = {
  const container = html`<div style="height:400px;">`;
  yield container; // Give the container dimensions.
  const map = container.value = new mapboxgl.Map({
    container,
    center: [0,0],
    zoom: 1,
    style: mapStyle(),
    scrollZoom: false
  });
  
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  var marker = new mapboxgl.Marker()
    .setLngLat([longitude, 0])
    .addTo(map);
  
  invalidation.then(() => map.remove());
}