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Re:Show HN: Stalker, a jQuery Plugin That Follows Users on a... by pestaa on Wednesday November 07, 2012 @04:27AM (#4752811)
Actually I believe it is position: fixed.
Re:Show HN: Stalker, a jQuery Plugin That Follows Users on a... by michalstanko on Wednesday November 07, 2012 @05:02AM (#4752871)
From the article linked above:

"position: sticky is a new way to position elements and is conceptually similar to position: fixed. The difference is that an element with position: sticky behaves like position: relative within its parent, until a given offset threshold is met in the viewport."