PhantomJS Media Query Screenshot

gistfile1.txt

var page = new WebPage(),
    address, output, size;

  address = "http://www.wesbos.com/";
  width = 1024; height = 600;
  output = "./screenshots/screenshot-"+width+"X"+height+".png";


  page.viewportSize = { width: width, height: height };
  if (phantom.args.length === 3 && phantom.args[1].substr(-4) === ".pdf") {
      size = phantom.args[2].split('*');
      page.paperSize = size.length === 2 ? { width: size[0], height: size[1], border: '0px' }
                                         : { format: phantom.args[2], orientation: 'portrait', border: '1cm' };
  }
  page.open(address, function (status) {
      if (status !== 'success') {
          console.log('Unable to load the address!');
      } else {
          window.setTimeout(function () {
              page.render(output);
              phantom.exit();
          }, 900);
      }
  });