site.js

var map = L.mapbox.map('map', 'tmcw.map-u4ca5hnt', {
    tileLayer: {
        detectRetina: true
    }
})
    .setView([38.9, -77.03], 14);

map.addLayer(L.geoJson(
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document.getElementById('output').addEventListener('click', function() {
    leafletImage(map, doImage);
});

window.setTimeout(function() {
    map.panBy([100, 100]);
    // map.setView([0, 0], 2);
    window.setTimeout(function() {
        leafletImage(map, doImage);
    }, 1000);
}, 1000);

function doImage(err, canvas) {
    var img = document.createElement('img');
    var dimensions = map.getSize();
    img.width = dimensions.x;
    img.height = dimensions.y;
    img.src = canvas.toDataURL();
    document.getElementById('images').innerHTML = '';
    document.getElementById('images').appendChild(img);
}