MapBox.js With SVG Markers

<!DOCTYPE html>
<html>
<head>
  <script src='https://api.tiles.mapbox.com/mapbox.js/v0.6.6/mapbox.js'></script>
  <link href='https://api.tiles.mapbox.com/mapbox.js/v0.6.6/mapbox.css' rel='stylesheet' />
  <style>
    body { margin:0; padding:0; }
    #map { position:absolute; top:0; bottom:0; width:100%; }
    #marker {
        position:absolute;
        margin-top:-25px;
        margin-left:-25px;
        width:50px;
        height:50px;
        display:none;
        pointer-events:all;
    }
  </style>
</head>
<body>
<div id='map'></div>
<svg id='marker' xmlns="https://www.w3.org/2000/svg" version="1.1">
<circle cx="25" cy="25" r="25" style="fill:#000" />
</svg>
<script>
  var map = mapbox.map('map');
  map.addLayer(mapbox.layer().id('examples.map-20v6611k'));

var markerLayer = mapbox.markers.layer();

markerLayer.factory(function(f) {
      var m = document.getElementById('marker').cloneNode(true);
      m.style.display = 'block';
      return m;
  });
  map.addLayer(markerLayer);

map.zoom(5).center({ lat: 37, lon: -77 });

markerLayer.add_feature({
      geometry: {
          coordinates: [-77, 37.9]
      },
      properties: {
          'marker-color': '#000',
          'marker-symbol': 'star-stroked',
          title: 'Example Marker',
          description: 'This is a single marker.'
      }
  });
</script>
</body>
</html>

Modified http://api.tiles.mapbox.com/mapbox.js/v0.6.6/mapbox.js to a secure url

https://api.tiles.mapbox.com/mapbox.js/v0.6.6/mapbox.js