Commits on Aug 17, 2017

1. Improve containing block creation for position:absolute flows …

   Instead of only promoting flows with positioned fragments to containing
   blocks, also do this for flows which have the transform, perspective or
   filter properties set. This is what the spec requires and also fixes
   some failing tests. It will allow us to stop creating stacking contexts
   for overflow:hidden and overflow:scroll flows.
   
   Fixes #18091.

   

   mrobinson committed Aug 17, 2017

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