Mirror Effect
CSS3 Mirroring Effect achieved with the Transform module. You might want to read this article to understand Matrix Transforms properly. Also, the author of that article made a nice tool that is relevant. The text in the demo is contenteditable. So try adding and deleting some text and observe the behaviour.
Try something cool with the demo, like replace all HTML code with just an iframe with a particular source and it's height and width set to 100%. If you try it, you might also need html, body { height: 100%; } in the CSS code. I am sure the result will amaze you!