Most of the comments here are bashing this for ease of defeat and not having a useful reason for it's existence. While I agree that it's easy to defeat, it cou

Most of the comments here are bashing this for ease of defeat and not having a useful reason for it's existence. While I agree that it's easy to defeat, it could be interesting in test cases to make sure there aren't any DOM side effects to an operation. You could also use it to ensure that there are proper side effects. Probably not the best way to do it, but still a cool idea in my opinion.