The pages isn't vertical, paragraphs are kind of thrown about. Pretty obvious though.
Confirmed with r31381, regression from Safari 3.1.
This regressed between r31114 and r31132. Suspicious commits include:
Created attachment 20158 [details]
*** Bug 18207 has been marked as a duplicate of this bug. ***
Created attachment 20356 [details]
Fixed in <http://trac.webkit.org/projects/webkit/changeset/31734>.
*** Bug 18330 has been marked as a duplicate of this bug. ***