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Retina

Detecting Retina and using Retina Tiles
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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Retina</title>
  
  <script src='http://api.tiles.mapbox.com/mapbox.js/v0.6.7/mapbox.js'></script>
  <link href='http://api.tiles.mapbox.com/mapbox.js/v0.6.7/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>
var map = mapbox.map('map').zoom(5);
var retina = window.devicePixelRatio >= 2;
if (retina) {
    // Retina tiles are sized 1/2 of normal tiles for twice the pixel
    // density
    map.tileSize = { x: 128, y: 128 };
    // use a retina tileset
    map.addLayer(mapbox.layer().id('examples.map-zq0f1vuc'));
} else {
    // use a standard tileset
    map.addLayer(mapbox.layer().id('examples.map-vyofok3q'));
}
</script>
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