It could but should not. A better product for that might be Optimizely, where you can use your actual URL. However, I once worked with an extremely obsessive owner of a business and she sat by me each time I made any changes to the copy on the website to make sure it flowed correctly when in situ, I would have sent this to her to make my life a little easier had it existed back then.

Actually, surprisingly good for our our marketer/designer to quickly mock up small changes to our landing page. We wouldn't share it publicly, but for internal use kinda neat.