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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.
The CSS3 Media Queries module was released as an official W3C Recommendation on 19 June 2012, marking the end of a development cycle that began over ten years ago (the first working draft of the specification was published on 4 April 2001).