D3 Examples - Layer parent access

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<!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%; }
  </style>
</head>
<body>
<div id='map'></div>
<script>
    mapbox.load('examples.map-vyofok3q', function(o) {
        mapbox.map('map', o.layer).zoom(5).center({ lat: 38, lon: 90 });
        document.onmousemove = function(e) {
            o.layer.parent.style.opacity = e.clientX / window.innerWidth;
        };
    });
</script>
</body>
</html>
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