I'm filing this bug to track changes that are (or have been in the past) needed to our CSS flexbox implementation, due to a spec change. (I'm hoping this reduces the likelihood that an important spec change will get forgotten about and accidentally un-implemented.)
Summary: Tracking bug for flexbox spec changes → Tracking bug for CSS flexbox spec changes
Also: I've just filed bug 1057162 to cover website issues of the sort discussed in comment 1 - comment 3. Any subsequent discussion on that topic should go over there.
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