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http://lists.w3.org/Archives/Public/www-style/2011Nov/0129.html
WebKit implements this: https://bugs.webkit.org/show_bug.cgi?id=60525 New values are reverse, alternate-reverse.
Fixed in https://dvcs.w3.org/hg/csswg/rev/b531bcdc39f7
*** Bug 14714 has been marked as a duplicate of this bug. ***