I agree - this is part of a tutorial, and these examples are really to prove this point. Animations using javascript were great when we didn't have anything el

I agree - this is part of a tutorial, and these examples are really to prove this point. Animations using javascript were great when we didn't have anything else, but nowadays they should only be used in browsers without support. What would be really cool would be a DOM method that tied into the animation code that powers transitions.