Summary:
The behavior the WG proposed is way more subtle than what that bug implements,
including:
* Implementing two logical overflow longhands.
* Expanding the overflow shorthand to different longhands depending on the
syntax of that.
Meanwhile, Blink hasn't done the swap and will ship the same behavior that we
shipped in Firefox 61 (bug 1453148), that is, overflow-x, then overflow-y.
So I think lacking a clear way forward we should revert this change and preserve
our shipped behavior.
Reviewers: dbaron!
Tags: #secure-revision
Bug #: 1492567
Differential Revision: https://phabricator.services.mozilla.com/D6317
