Is it possible to switch off the retina resolution in Macbook Retina, and view everything like older macbooks?

I havent yet gotten my self a Macbook Pro Retina yet, but considering.
When designing websites, it's of course important to be able to easily test how the websites look in different browsers, screensizes and devices.
So my question is, if I want to see i.e. how images on a website I'm developing would look and scale on older macs and other non-retina devices, is it possible to make the screen "go ugly" again and make 4pixels next to eachother form one pixel.
Of course, there might be another much better way to accomplish what I'm after, please feel free to present other ideas!
Also, if it's not yet possible, is the os x open in a way, that I could develop an app that would do it?
Thank you very much for your replies!

Retina display: 15.4-inch (diagonal) LED-backlit display with IPS technology
2880-by-1800
native resolution at 220 pixels per inch with support for millions of colors
Scaled resolutions: 1920 by 1200, 1680 by 1050, 1280 by 800, and 1024 by 640 pixels
Retina display: 13.3-inch (diagonal) LED-backlit display with IPS technology
2560-by-1600
native resolution at 227 pixels per inch with support for millions of colors
Scaled resolutions: 1680 by 1050, 1440 by 900, and 1024 by 640 pixels

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