henrahmagix/sticky — pull request #1 by henrahmagix (2014-06-02 15:47:09+00:00)
Title: Stop sticky from going outside constraint element.

This is so the sticky can be `position: fixed` up until it starts
to flow outside of a constraint element, at which point its
position is measured and it gets stuck at that point in the
container. It means a sidebar can have a sticky element so far as
the element is within the sidebar, which may not span the entire
height of the document.