Stick your landings! position: sticky lands in WebKit
position: stickyis a new way to position elements and is conceptually similar toposition: fixed.The difference is that an element withposition: stickybehaves likeposition: relativewithin its parent, until a given offset threshold is met in the viewport.
Great, native replacement for a simple scroll hack. Until this becomes an adopted standard, you may want to check out the Affix plugin in Twitter Bootstrap.