Convert svg to png with styling using phantomjs

png.js

#!/usr/bin/env phantomjs
/*
 * Convert svg to png using PhantomJS
 *
 * Usage: png.js filename.svg filename.png
 *
 * Asses width and height attributes are present on the svg node
 *
 */
var system = require('system');
var args = system.args;
if (args.length < 3) {
    console.log("Usage: png.js filename.svg filename.png");
    phantom.exit(1);
}

var page = require('webpage').create();
page.open(args[1], function() {
    sz = page.evaluate(function() {
        width = document.getElementsByTagName('svg')[0].getAttribute("width");
        height = document.getElementsByTagName('svg')[0].getAttribute("height");
        return {'width': width, 'height': height};
    });

    page.clipRect = { top: 0, left: 0, width: sz.width, height: sz.height };
    page.render(args[2]);
    phantom.exit(0);
});