Some other things that come to mind:
* This approach makes it trivially possible to incrementalize display
list construction at the granularity of stacking contexts. Which,
admittedly, is not a great level of granularity for many common
scenarios, but it would at least handle stuff like setting `transform`
(e.g. the maze solver).
* Blink is working on moving to a `FrameLayerBuilder`-like approach to,
among other things, allow correct paint order for layerized objects, so
we should keep that in mind when deciding whether to follow WebKit's
spec breaking in this regard.
Patrick
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