We've added a new /helpers/_extends.sass files for additional useful Sass extends that aren't included in MVCSS.
%fauxHide and %fauxShow are the first two extends to kick off this new file.
I know, we're so funny. These are aptly named, and useful, though. When you're animating elements in CSS, you can't animate an element from display: none to display: block, so you have to fake hiding the element in order to do this. These extends will help you do that. Just extend them into your selector, and animate to your heart's desire.