Marker Movement

Simple marker animation
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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Marker Movement</title>
  
  <meta name='viewport' content='width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no' />
  <script src='//api.tiles.mapbox.com/mapbox.js/v1.5.0/mapbox.js'></script>
  <link href='//api.tiles.mapbox.com/mapbox.js/v1.5.0/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 = L.mapbox.map('map', 'examples.map-20v6611k');

var marker = L.marker([0, 0], {
    icon: L.mapbox.marker.icon({
        type: 'Feature',
        geometry: {
            type: 'Point',
            coordinates: [-77, 37.9]
        },
        properties: { }
    })
});

var t = 0;
window.setInterval(function() {
    // making a lissajous curve here just for fun. this isn't necessary
    // Reassign the features
    marker.setLatLng(L.latLng(
        Math.cos(t * 0.5) * 50,
        Math.sin(t) * 50));
    t += 0.1;
}, 50);

marker.addTo(map);
</script>
The code and documentation to mapbox.js is hosted on GitHub where you can contribute changes and improvements.