Patrick Walton 1e884ddc69 layout: Allow non-absolutely-positioned elements with overflow: scroll ...

set to be scrolled.

This makes them establish stacking contexts, which is a CSS 2.1 spec
violation. However, we were already violating the spec here for
absolutely-positioned elements with `overflow: scroll`. It will probably
be easier to fix this spec violation once we either switch entirely to
WebRender or we have multiple layers per stacking context.

Closes #2742.

2016-04-06 17:58:47 -07:00

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