Martin Robinson 57704b0481 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.		2017-08-17 20:46:27 +02:00
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html	Improve containing block creation for position:absolute flows	2017-08-17 20:46:27 +02:00