anchor.diff:      meta(charset='utf-8')
       title Single marker
       meta(name='viewport', content='initial-scale=1,maximum-scale=1,user-scalable=no')
  +    link(src='//mapbox.com/base/latest/base.css', rel='stylesheet')
       script(src='https://api.mapbox.com/mapbox.js/v2.2.1/mapbox.js')
       link(href='https://api.mapbox.com/mapbox.js/v2.2.1/mapbox.css', rel='stylesheet')
       script(src='https://api.mapbox.com/mapbox.js/plugins/leaflet-markercluster/v0.4.0/leaflet.markercluster.js')
  
positive.code:     style.
        body { margin:0; padding:0; }
        #map { position:absolute; top:0; bottom:0; width:100%; }
      script.
        window.twttr = (function(d, s, id) {
        var js, fjs = d.getElementsByTagName(s)[0],
  
negative.code:       socket.on('remove tweet', function(tweet) {
          markers.removeLayer(twid_marker[tweet.properties.tweet_id]);
        });
      <script async defer id="github-bjs" src="https://buttons.github.io/buttons.js"></script>
  