Patrick Walton 1c1c507c03 layout: Implement opacity per CSS-COLOR § 3.2. ...

This adds the infrastructure necessary to support stacking contexts that
are not containing blocks for absolutely-positioned elements. Our
infrastructure did not support that before. This minor revamp actually
ended up simplifying the logic around display list building and
stacking-relative position computation for absolutely-positioned flows,
which was nice.

2014-12-03 14:17:16 -08:00

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