Commits on Aug 16, 2017

1. Add support for position:sticky …

   We add a new clip scroll tree node type which is a sticky frame. The
   StickyFrame doesn't do any clipping, but will adjust the position of its
   contents to satisfy a given set of sticky constraints. The constraints
   consist of a margin (distance from the particular edge of the viewport)
   and a max_offset, which determines how far the sticky frame can move
   from its original (scrolled) position. The design of these  constraints
   can be modified if they are particularly unpleasant for Gecko to
   implement.
   
   Fixes #1277.

   

   mrobinson committed Aug 16, 2017

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