+postclear Compass mixin

gistfile1.sass

// Adds a pseudo element :after that clears floats, preventing them from riding
// up into the element, while still allowing the element to wrap around floats
// before it. This is useful for ensuring floating elements remain in place,
// vertically, when the non-floating elements are too short to push them down. 
=postclear($side: both)
    &:after
        content: " "
        display: block
        clear: $side