I thought this was going to teach me how Houdini did some of his magic tricks :(
"Houdini is a set of low-level APIs that exposes parts of the CSS engine, giving developers the power to extend CSS by hooking into the styling and layout process of a browser’s rendering engine. Houdini is a group of APIs that give developers direct access to the CSS Object Model (CSSOM), enabling developers to write code the browser can parse as CSS, thereby creating new CSS features without waiting for them to be implemented natively in browsers."
To that end; if you aren't a magician and have no interesting in becoming one, do yourself a favor and don't try to figure out how a trick is done. You don't look at The Mona Lisa and yell, "That's not a real picture, he used paint to create it!" Not only is that rude to the magician but it ruins it for yourself. Appreciate and enjoy the art for what it is.